North Central Region Licthic Materials

Materials Identification Guide

North Central Region Lithic Material

Name	Natural	Non-heat treated points	Heat treated points	Color details	Primary found in:	Associated Formation / Member
Abitibi Chert AKA: Lake of the Woods Chert				Ranges in color white mottled with green, to a homogenous dark green	Ontario, Wisconsin, Saskatchewan, Manitoba, North Dakota, Minnesota	South Kakagi Lake formation
Ajibik Quartzite AKA: Kakabeka Quartzite				Ranges from a light gray to a flesh or tan color. Commonly stained spots that range from tan to yellow, or a reddish brown	Ontario, Wisconsin, Minnesota	Lower Marquette series
Alma Quartzite Variations: Buffalo County Quartzite and Lacross County Quartzite				Range from white to purple (Alma Quartzite), to an off white to a tan (Lacross variation), or tan to brown (Buffalo variation).	Wisconsin, Minnesota, Iowa
Animikie Chert				Deep green color	Minnesota, Ontario	Animikie formation, Marquette Range subgroup
Anvil Ferruginous Chert				Ranges from a dark gray to a greenish gray or reddish brown. Dark reddish brown or black inclusion are commonly present.	Northwestern Michigan	Anvil Ferruginous Chert Member of the Ironwood Iron Formation
Arcadia Ridge Orthquartzite				Ranges in color from a tannish white to a light tan	Wisconsin, Minnesota
Argentine Chert				Ranges in color from a light tan to a pale to medium gray. Light mottling or streaking may be present.	Missouri, Kansas, Nebraska, Iowa	Argentine Member of the Wyandotte Limestone Formation
Attica Chert AKA: Indiana Greenstone and Independence Chert				Ranges from a greenish gray to gray or blue-gray with occasional mottled or streaked with swirls of light to medium green	Indiana, Illinois	Muldraugh Formation of the Borden Group
Atoka Argillite				Ranges in color from a dark gray to black	Arkansas, Missouri, Oklahoma, Kansas	Atoka formation
Atoka Chert				Ranges from a medium to dark gray	Arkansas, Missouri, Oklahoma, Kansas	Atoka formation
Atoka Siltstone				Ranges from a medium to dark gray	Arkansas, Missouri, Oklahoma, Kansas	Atoka formation
Auburn Chert				White to bluish white	Missouri	Plattin Limestone Formation
Avon Chert				Primarily shades of white with tans and reds occurring	Illinois	Burlington Limestone formation
Bailey Chert				Ranges from shades of light gray to tan or beige or caramels	Missouri, Illinois, Kentucky	Bailey Formation Limestone
Bakers Narrows Chert				Two variations. The most common is a dark dense chert with wide irregular lighter colored banding. The second is a white limestone chert.	Manitoba
Banded Jasper				Multi colored with red banding	Minnesota, Wisconsin
Baraboo Quartzite				Varying shades of pink to red or maroon banded with lighter pinks and whites	Wisconsin
Barren Fork Chert				Barren Fork Chert ranges from a light to medium gray or a tan.	Missouri, Arkansas, Oklahoma	Sallisaw Formation
Barron County Pipestone				Ranges in color from a homogenous pink to red.	Wisconsin, Minnesota, Michigan
Barron County Quartzite				Ranges in color from a light yellow to a pale purplish pink. Striping, banding, or staining may be present	Wisconsin, Minnesota
Baylis Chert					Illinois, Missouri	Baylis Formation
Bayou Manard Chert				Black chert with white fossil specks	Oklahoma, Kansas, Missouri	Moorefield formation, Bayou Menard member
Bayport Chert				Varies from light brown to a medium gray. White quartz inclusions can form white clouds or bulls eye forms in the material, Banding may be present.	Michigan, Ontario, Wisconsin, Ohio, Indiana	Bayport Limestone formation
Bessemer Quartzite					Michigan, Wisconsin	"Nopeming formation", Puckwunge formation, Osier Group
Bethany Falls Chert				Ranges from light to dark gray	Minnesota, Iowa, South Dakota, Nebraska	Swope Formation
Biwabik Silica					Minnesota
Blair / St. David Chert				Moderately translucent chert that ranges in color from a medium gray to dark bluish gray with brownish mottling and grayish streaks.	Illinois, Missouri	Carbondale Group of the St. David Limestone
Blair Chert Blair - St. David Chert				Moderately translucent chert that ranges in color from a medium gray to dark bluish gray with brownish mottling and grayish streaks.	Illinois, Missouri	Carbondale Formation of the St. David Limestone
Blair Creek Basalt				Dark gray in color	Michigan, Wisconsin	Blair Creek formation, Menominee Group
Blanding Chert Silurian Chert variant				Ranges from white to gray with faint bands of pale yellow, brown, and orange	Wisconsin, Minnesota, Illinois, Iowa	Blanding formation
Bois Blanc Formation Chert				Color ranging from almost white to grays, browns, and blues	Ontario, Michigan, Wisconsin, New York	Bois Blanc Formation Limestone
Boone Chert AKA: Sallisaw Chert, Grand Falls Chert, Ti Valley Chert				Ranges from a light gray to white	Oklahoma, Arkansas, Missouri	Boone Limestone Formation
Bowling Green Chert					Southeastern Missouri	Bowling Green Member of the Edgewood Limestone Formation
Buffalo County Quartzite Alma Quartzite variant				Range from a tan to brown	Wisconsin, Minnesota, Iowa
Burlington Chert				Varies from white to gray or tan. Banding and mottling may be present	Illinois, Iowa, Missouri, Indiana, Kentucky, Tennessee, Arkansas, Mississippi	Burlington Limestone Formation
Carter Cave Chert AKA for Paoli Chert				Translucent and ranges in color from yellow to tan, red, and orange. Rarely green and blue are present	Kentucky, Indiana, Illinois	Paoli Limestone formation
Cat Head Chert				Ranges from a pale yellowish gray to a slightly mottled yellowish gray, black when heat treated	Manitoba	Cat Head Member of the Red River Formation.
Catlinite AKA: Red Pipestone				Ranges from a brownish red to a deep red color	North Dakota, South Dakota, Iowa, Minnesota	Sioux Quartzite Formation
Cave in Rock Chert					Illinois, Kentucky	Ste. Genevieve Limestone formation
Cedar Hill Chert					Missouri
Cedar Valley Chert Rapid Chert				Translucent ranging from a light to medium brown	Wisconsin, Minnesota, Iowa	Cedar Valley Formation, Rapid Member
Cedar Valley Jasper					Minnesota
Chouteau Chert				Ranges from a light to medium gray. Oolites form whitish speckles throughout the material with vugs present.	Illinois, Missouri	Chouteau Formation
Clear Creek Chert				Ranges from a slight yellowing gray to white	Illinois, Indiana, Kentucky, Tennessee	Overlies the Backbone Limestone formation
Cobden- Dongola Chert AKA: Anna Chert, Hornstone, and St. Louis Ball Chert				Shades of dark gray to blue-gray which may be solid or have dark gray bands	Illinois, Indiana, Missouri, Kentucky	St. Louis Limestone
Cochrane Chert				Ranges in color from a medium tan to a dark brown. It is often banded or mottled. Quartz inclusion may be present.	Wisconsin, Minnesota	Reedstown Member
Compton Chert				Bluish black chert	Missouri	Compton Formation of the Chouteau Group
Cotter Chert AKA: Swan Creek Chert				Ranges in color from a light gray or blue with light tan to white banding.	Missouri, Arkansas	Cotter Formation
Coyote Creek Chert (Burlington Chert variant)					Missouri
Crab Orchard Banded Chert AKA: Gray Banded, Jelly Roll, Kentucky Stromatoporoid chert				Banded gray and white. It has broad alternating bands of light to dark whites and grays followed by darker grays to almost black	Kentucky, Tennessee, Indiana, Illinois	Crab Orchard member
Crescent Chert (Burlington Chert variant)				Ranges from a brilliant white to a icy blue and commonly banding of darker colors.	Illinois, Missouri	Burlington Limestone Formation
Croton Tabular Chert Warsaw Tabular Chert				Very opaque and ranges in color from a creamy gray to a light gray with a off white to light tan cortex.	Iowa	Croton formation
Crowley's Ridge Chert				Ranges from brown to tan, greyish tan, yellowish tan, or cream.	Arkansas, Missouri	Glacial Till
Crushman Chert				Mottled dark gray	Missouri, Kansas, Arkansas, Oklahoma	Boone Limestone formation
Curzon Chert				Ranges from a a light yellow brown to a light olive brown or brownish gray to a medium dark gray	Iowa, Nebraska	Curzon Limestone of the Topeka formation
Dactite Arrow Stone				Commonly a light grayish white, but may range to a dark gray	Western North America
Degonia Chert				Ranges from white to gray and blue	Kentucky, Illinois, Indiana	Degonia formation
Detour Chert Fossil Hill variation				Ranges in color from a bluish gray to a dark brown. White circular inclusions are present in this chert	Ontario, Michigan	Fossil Hill Formation
Dongola Chert				Dark tan to dark brown with banding of dark brown	Illinois, Missouri, Kentucky, Tennessee	St. Louis formation
Dover Chert Fort Payne variant AKA: Elco Chert				Range from a light tan to almost a black chocolate brown with swirls, bands, or streaks of light to dark	Illinois, Indiana, Ohio, Kentucky, Tennessee	Fort Payne Formation
Dupo Chert Burlington Chert variation					Illinois, Missouri
Eagle Point Chert				Ranges from a light gray to a gray. Fossils form whitish to pinkish speckles.	Illinois	Dunleith Formation, Eagle Point Member
Elsey Chert				Ranges from a solid white to cream or a mottled white to cream with irregular blotches or spots of gray and brown.	Missouri	Elsey Formation
Elwood Chert Elwood- Joliet Chert				Ranges from white to gray	Illinois, Wisconsin, Iowa	Elwood formation
Eminence Chert				Commonly gray, but may vary to a dark gray or reddish brown, vugs and fine banding of cloudy white and light gray may be present	Missouri, Illinois	Eminence Formation
Ervine Creek Chert				Ranges from a light medium gray to a dark gray. Larger white specks are formed by fossils	Nebraska, Iowa, Kansas, Missouri	Ervine Creek Limestone Member, Deer Creek Limestone Formation
Everett Chert				Gray with vugs present	Illinois	Nachusa Formation, Everett Member
Everton Interclastic Chert AKA: Everton Chert				Primarily a white to light brown, brown or tan. May vary from a pink-red, purple, and grey. Commonly brecciated.	Missouri, Arkansas	Everton Formation
Everton Quartzite				Ranges from a light to dark white to gray with weak banding of white and gray.	Missouri, Arkansas	Everton Formation
Excello Chert				Ranges from a dark bluish black to black. Chalcedony veins are commonly seen through the material	Missouri, Illinois, Iowa	Excello Formation
Fat Rock Quartzite				White	Minnesota	Little Falls formation
Fayetteville Chert					Missouri
Fern Glenn Chert					Missouri, Illinois	Fern Glenn formation
Flambeau Quartzite				Ranges from a reddish brown to a yellowish gray	Wisconsin	Flambeau Quartzite Formation
Flow Banded Rhyolite					Wisconsin
Foraker Chert AKA: Four Ace Chert				Light blue color with numerous snow white speckles of fossils.	Kansas, Oklahoma, Arkansas	Foraker Limestone Formation
Fort Payne Chert				Ranges in color from black to a grayish blue, or white to a bluish white. Bluish gray is the predominate color with bluish hues	Kentucky, Tennessee, Alabama, Mississippi, Georgia, West Virginia, Ohio, Indiana, Illinois	Fort Payne formation
Fort Scott Chert AKA: Bixby Black Chert				Ranges from a dark bluish black to black.	Oklahoma, Arkansas, Kansas, Missouri	Fort Scott Formation, Henrietta (Marmaton) Group
Fortune Chert				Ranging from a light cream to olive brown or tan color with mottling of a citrine drab to grayish olive gray and white speckles	Missouri, Arkansas	Fortune Formation
Galena Chert Platteville-Galena Chert				Ranges from gray to light tones of brown ,mottles and swirls White specks of fossil fragments. Small flat vugs may be present.	Illinois, Wisconsin, Iowa	Platteville Dolomite formation
Gasconade Chert				Banded ranging from a light gray to a dark gray	Missouri	Gasconade Formation
Girardeau Black Chert				Dark bluish black chert.	Missouri	Girardeau Limestone Formation, Maquoketa Group
Gordon Lake Chert				Ranges in color from a light greenish gray to a darker green chert or quartzite	Ontario, Michigan	Gordon Lake Formation
Gower Chert					Iowa, Illinois	Gowen Formation, Silurian System
Grand Falls Chert AKA: Butcher Knife Chert Boone Chert variant				Light gray color and may vary to brown	Missouri, Kansas, Oklahoma, Arkansas	Grand Falls Member of the Boone Formation
Grand Meadow Chert				Range from a light to medium gray and may be a solid color or mottled, may have a golden hue	Wisconsin, Minnesota, Iowa
Grand Portage Graywacke				greenish gray color	Minnesota	Grand Portage Formation
Grassy Knob Chert				Ranges in color from a pale yellowish gray to a light olive brown	Illinois, Indiana, Kentucky	Bailey Limestone formation
Grime Hills Chert Burlington Chert variant					Illinois	Burlington Limestone Formation
Grover Gravel Chert Lafayette Gravel variation				Ranges from brown to tan, greyish tan, yellowish tan, or cream. Mottling is commonly seen, and rarely banding may be present.	Illinois, Missouri	Lafayette Gravel Formation
Gun Flint Silica Brandon Flint				Translucent to transparent and ranges in color from a gray to bluish gray or almost colorless. Small black inclusions throughout the material	Ontario, Minnesota	Gunflint Formation, Animikian Group
Hampton Chert				White and off white.	Iowa	Hampton Member of the Maynes Creek Formation
Harmilda Chert AKA: Bolingbrook Chert, Sugar Chert, Crystal Chert				Semi-transparent and region. The Semi-translucent portion ranges from tan to gray and the opaque regions range from white to gray.	Illinois, Wisconsin	Silurian System
Harvester Creek Chert				Mottled light tannish brown to an orangish brown	Missouri, Illinois	Salem Formation
Hertha Chert				White to a light gray color	Kansas, Iowa, Missouri, Nebraska	Sniabar Member, Hertha Limestone Formation of the Kansas City Group
High View Chert Burlington Chert variant					Missouri
Hindsville Chert				Translucent gray with mottling of light blue to blue, gray, and light browns.	Arkansas, Oklahoma, Kansas, Missouri	Hindsville Limestone Member of the Batesville Formation
Hixton Silicified Sandstone / Quartzite AKA: Sugar Quartz				Range in color from white to tan (most common), but may vary from red to orange, lavender to brown, or yellows	Wisconsin, Minnesota, Iowa
Hopkinton Chert				Translucent light gray with white opaque mottling	Iowa, Illinois, Wisconsin	Hopkinton Formation
Hudson Bay Lowland Chert				Bluish gray to a light tan or pale yellow	Ontario, Saskatchewan, and into Minnesota	Severen, Ekwan, and Stooping river formations
Huronian Jasper AKA: St. Joseph Island and Drummond Island Puddingstone, Michigan Puddings				Conglomerate stone containing red jasper	Ontario, Michigan	Lorrain formation
Jacobsville Sandstone AKA: Redstone, Brown Stone, Lake Superior Sandstone, Eastern Sandstone				Ranges in color from a red or brown with mottling of pinks, browns, and whites.	Ontario, Michigan	Jacobsville formation
Jasper Taconite Taconite Jasper AKA: Gun Flint				Deep red color to black or blue with darker small round inclusions. The inclusion can vary in color from dark green, dark blue, or black	Ontario, Wisconsin, Minnesota	Gunflint Formation, Animikian Group
Jefferson City Chert Type 1: Oolitic				Ranges from an off white to a pale blue with white oolitic speckles	Arkansas, Missouri	Jefferson City Formation
Jefferson City Chert Type 2: Banded				Ranging from a off white to a pale purple with narrow banding alternating banding of brown, blue, and purple	Arkansas, Missouri	Jefferson City Formation
Jefferson City Chert Type 3: Mottled				Ranging from a off white to a pale purple with streaking, swirling, or disturbed banding of brown, blue, and purple	Arkansas, Missouri	Jefferson City Formation
Jefferson City Chert Type 4: Dense				White with a pearly luster	Arkansas, Missouri	Jefferson City Formation
Jefferson City Quartzite				Light and dark colors of white, pink, red, brown, and gray, homogenous to weak banding or weak mottling, occasional vugs and voids are present.	Arkansas, Missouri	Jefferson City Formation
Joliet Chert Elwood- Joliet Chert				Ranges from white to gray	Illinois, Wisconsin, Iowa	Joliet formation
Kakabeka Chert				Ranges in color from grays with streaks of yellow, orange, or reds. Needle shaped inclusions can give the material a wood grain appearance.	Ontario, Minnesota	Gunflint Formation
Kankakee Chert AKA for Blanding Chert Silurian Chert variant				Ranges from white to gray with faint bands of pale yellow, brown, and orange	Wisconsin, Minnesota, Illinois, Iowa	Blanding formation
Kaolin Chert				Ranges from hues of golden tans to gray and reds. Light banding may be present.	Illinois, Indiana, Kentucky, Missouri	Paleozoic Limestone formation
Kenwood Chert				Black color	Iowa	Kenwood Member of the Wapsipinicon Formation
Keokuk - Burlington Chert				Ranges from creamy white to grays with yellow and brown streaking	Illinois, Missouri	Keokuk Member Burlington Formation
Keokuk Chert				Ranges from a creamy white to a whitish pink with streaks or patches of whitish brown or whitish pink and reddish spots commonly present.	Missouri, Kansas, Arkansas, Oklahoma	Keokuk Formation of the St. Joes Group
Kimmswick Chert				Opaque and gray in color. Sparse black speckles are formed by pyritiferous particles.	Missouri, Arkansas	Kimmswick Formation
Kincaid Fossiliferous Chert				Ranges from a light gray or bluish gray to brown in color with speckles formed by fossils.	Illinois, Missouri	Kincaid formation
Knife Lake Siltstone				Ranges in color from a greenish gray to black	Ontario, Minnesota
Knife River Flint Knife River Chert, Knife River Chalcedony				Ranges in color from a root beer, tea, coffee, or caramel brown	South Dakota, North Dakota, Saskatchewan, Alberta, Nebraska, Iowa, Minnesota, Montana, Wyoming, Montana, Alberta, Saskatchewan	Eocene Golden Valley Formation
Kornthal Chert Breccia AKA: McNairy Chert Breccia				Brecciated to conglomeritic ranging from a pinkish gray, to red most common, blue, yellow, brown, and inclusions of white chert or quartz	Missouri, Illinois, Kentucky	McNairy Formation
La Porte City Chert				Most commonly a medium to dark gray. Less commonly the color ranges from a white to a light gray	Iowa	La Port City Chert Formation of the Devonian System
Laberdie Chert					Missouri, Kansas	Laberdie Limestone member of the Vamoosa Formation
Lacross County Quartzite Alma Quartzite variant				Range from an off white to a tan	Wisconsin, Minnesota, Iowa
Lafarge Banded Chert					Ontario	Amherstburg Limestone formation
Lafayette Chert				Most commonly ranges from brown to tan, greyish tan, yellowish tan, or cream, less common white and black occur. Mottling or rarely banded	Missouri, Illinois, Arkansas, Louisiana, Mississippi	Lafayette Gravel Formation
Lafayette Quartzite					Missouri, Illinois, Arkansas, Louisiana, Mississippi, Tennessee	Lafayette Gravel Formation
Lake of the Woods Chert				Ranges from a white mottled with green to a homogenous dark green to black color	Ontario, Saskatchewan, Manitoba, Minnesota, North Dakota	South Kakagi Lake Formation
Lake of the Woods Rhyolite				Ranges in color from a greenish gray to less commonly a gray. Streaks of brown to orangish brown may be present.	Ontario, Saskatchewan, Manitoba, Minnesota, North Dakota
Lake Superior Agate				Range in color from a light to dark salmon or coral color with alternating bands of white or light yellow. Colorless inclusions of quartz are often present.	Wisconsin, Michigan, Minnesota, Ontario	Nebraska - Archean System
Lake Vermillion Chert					Minnesota , Wisconsin, Ontario	Lake Vermillion Formation
Lindsey Bridge Chert				Ranges in color from white to tan or blue.	Missouri, Oklahoma, Arkansas	Lindsey Bridge Limestone Member of the Moorefield Formation
Lower Nachusa Chert				Ranges from a slightly mottled white and gray	Illinois	Nachusa Formation
Mansker Chert				Ranges in color from a tan to a dark brown or gray. Speckles from fossil remains may be present.	Illinois, Missouri
Maquoketa Chert AKA: Silurian 2 Chert				Ranges in color from a pale olive gray to a pale gray. Banding or streaking may be present.	Wisconsin, Minnesota, Iowa, Illinois	Maquoketa Formation
Marquette Rhyolite				Ranges in color from a medium to dark gray to a greenish gray color.	Wisconsin
Maynes Creek Chert				Opaque and comes in a variety of colors including; cream, gray, and green. It is commonly mottled and may be speckled or fossiliferous.	Iowa	Maynes Creek Limestone Formation
McNairy Quartzite				Tightly packed pale yellowish quartzite with limited or no inclusions. Red staining may be present.	Illinois, Kentucky, Missouri	McNairy Formation
Mesnard Quartzite				Ranges in color from a a light gray to shades of pink and light red. Weathers to white.	Michigan, Ontario	Algonkian Formation, Chocolay Group, Animikie Series
Mill Creek Chert				Vary from white to gray, grayish brown, orange white to orange gray, or pale blue to black. Concentric banding may be present	Illinois, Kentucky, Missouri, Mississippi, Arkansas	Salem / Ullim Limestone formation
Moline Chert				Opaque to slightly translucent, ranges from a light gray to a very dark gray, streaks or specks of black, bluish tints are commonly present	Iowa	Spoon Formation
Montrose Chert				Light to medium bluish gray and often resembles a chert breccia.	Iowa Illinois, Missouri	Montrose Member of the Keokuku Limestone Formation
Mounds Gravel Chert AKA: Elco Gravel Chert Lafayette Chert variation				Most commonly ranges from brown to tan, greyish tan, yellowish tan, or cream. Less commonly white, black, pink, red, olive gray or greenish gray	Illinois, Kentucky	Lafayette Gravel Formation
Mozarkite Chert				Ranges from hues and shades of gray, brown, pink, purple, and green. Concentric banding or mottling is present.	Missouri	Cotter Formation
Nehawka Chert Rice Grain Chert and Pennsylvanian Chert				Ranges from grayish blue to blue with oolitic white specks	Nebraska, Kansas, Iowa	Pennsylvanian Limestone Formation
Oneota Chert AKA: Oneota Prairie de Chein Chert (lower)				Ranges from white to gray or yellowish or orange	Ontario, Michigan, Wisconsin, Minnesota, Illinois, Iowa	Lower Prairie de Chien Group, Oneota formation
Onondaga Chert AKA: Buttermilk Falls, Black Rock, Clarence, Coniferous, Diver's Lake, Edgecliff, Moore House, Nedrow, Seneca, Fort Erie Chert				Vary from light to dark gray to a mottled bluish gray to a dark brown or black or tan.	Ontario, Quebec, New York, Pennsylvania, Ohio, Michigan, Illinois, Indiana, Kentucky, West Virginia,	Onondaga Limestone Formation
Osage Chert Osage Undifferentiated Chert				Ranges from a white to light gray or light brown. Occasionally gray to dark gray mottling is present.	Missouri, Illinois, Kansas, Oklahoma, Arkansas	Osage Series
Palisades Kepler Chert				Ranges from a tan to black	Iowa	Scotch Grove Formation, Buck Creek Member
Paoli Chert AKA: Carter Cave Chert				Translucent and ranges in color from yellow to tan, red, and orange. Rarely green and blue are present	Indiana, Illinois, Kentucky	Paoli Limestone formation
Payson Chert AKA: Adams County Flint				Banded ranging in color from a tan to orange or red	Illinois, Missouri
Penters Chert AKA: Pinters Chert				Ranges from a highly variegated ranging from medium to dark gray, bluish gray, grayish brown, or mottled ranging white to pale gray or pale brown.	Arkansas, Missouri	Penters Formation
Peoria Chert AKA: Tahlequah Chert				Primarily white but ranges to a pale yellowish what to a yellowish brown or pink	Oklahoma, Missouri, Arkansas	Tahlequah Member of the Moorefield Formation
Pierson Chert				Ranges in color from a mottled gray, cream, and brown to light blue or brick red	Arkansas, Missouri	Pierson Formation of the Osagean Series
Pitkin Chert				Ranges from a dark bluish gray to black. Light blue may occur. Non-concentric banding and vugs may be present. White speckles commonly present	Arkansas, Oklahoma, Missouri, Kansas	Pitkin Limestone Formation
Platteville - Galena Chert Galena Chert				Ranges from gray to light tones of brown ,mottles and swirls White specks of fossil fragments. Small flat vugs may be present.	Illinois, Wisconsin, Iowa	Platteville Dolomite formation
Plattsburg Chert				Light brown color.	Kansas, Nebraska, Missouri	Plattsburg Limestone Formation
Plattsmouth Fossiliferous Chert Rice Agate				Ranges in color from a medium to medium dark gray or brownish gray or almost black. Light brownish fossils form specks.	Iowa and into Nebraska	Plattsmouth Member of the Oread Formation, Virgilian series, Shawnee Group
Port Arther Jasper				Range from a red to a purple color	Ontario	Gunflint Formation, Animikian Group
Portage Lake Rhyolite AKA: Portage Lake Quartzite				Varying shades of red with conglomerate or copper inclusions being present.	Michigan
Potosi Chert					Missouri	Potosi Dolomite Formation
Powers Bluff Quartzite				Pink in color	Wisconsin	Aprin Conglomerate formation of the Animikie Group
Prairie du Chein Chert				Mottled and ranges in color from an off white to a light cream	Illinois, Wisconsin, Iowa	Prairie du Chein group
Racine Chert AKA: Engadine Chert				Ranges from a grayish white to a medium gray or bluish gray. Mottling or streaks of bluish tints may be present	Wisconsin, Illinois	Racine Limestone Formation
Rapid Chert Cedar Valley Chert variation				Ranges in color from a medium gray to a olive gray or yellowish gray, grayish orange, or pale brown with darker fossil inclusions.	Iowa, Minnesota	Rapid Member of the Cedar Valley Formation
Raytown Chert Fusulinid Chert				Ranges in color from a pale brown to a dark reddish gray, grays, tans, or pinkish white. Often broad light mottling is present	Iowa	Raytown member, Iola Limestone Formation, Kansas City Group
Red River Chert				Ranges from white to light gray or light brown and may vary from a solid color to mottled	Manitoba, Ontario, Minnesota, North Dakota, South Dakota
Reed's Spring Chert AKA: Carr Branch Chert				Opaque chert ranging in color from a bluish gray to a light gray or yellowish brown.	Missouri, Arkansas, Oklahoma, Kansas	Reed's Springs formation
Republic Chert				Knotted chert with alternating bands of light and dark.	Missouri	Republic Formation, Graydon Sandstone Formation
Rib Mountain Quartzite AKA: Rib Hill Quartzite				Ranges from a white to a pale pinkish color	Wisconsin
Root River Chert / Jasperoid Cedar Valley Chert variation				Opaque and ranges in color from yellowish brown to dark brown or an ocher color with mottling	Wisconsin, Minnesota, Iowa	Cedar Valley Formation, Rapid Member.
Rossport Chert				Opaque and black in color	Michigan, Ontario	Gunflint Formation, Animikian Group
Roubidoux Chert				Ranges in color from white, gray, yellow or cream, and nearly black.	Missouri	Roubidoux Formation
Roubidoux Quartzite					Missouri	Roubidoux Formation
Salem Chert				Ranges from a dull brown to gray	Illinois, Kentucky	Salem Formation
Scotch Grove Chert AKA: Wapsipinicon Chert				Mottled and ranges from a gray to a light tan or brown	Iowa	Scotch Grove Formation, upper Silurian Group
Sedalia Chert				Ranges from a white to light gray.	Missouri	Sedalia Formation of the Chouteau Group
Selkirk Chert AKA: Dundee Chert				Range in color from light gray to yellowish gray, dark gray, , black or brown. White to light gray bands or clouds are present	Ontario, Michigan, Ohio, Manitoba, Wisconsin, Minnesota	Dundee Limestone Formation
Sexton's Creek Chert				Ranges from a light bluish gray to a caramel brown	Illinois, Missouri	Sexton's Creek Limestone Formation
Shakopee Chert				Ranges from white to gray with contrasting banding	Illinois, Indiana, Wisconsin, Minnesota, Iowa, Missouri	Shakopee Dolomite formation
Sheldon Chert				Translucent to opaque chert ranging from a light to dark gray or yellowish brown and pinkish brown. Densely filled with fossil fragments	Iowa, Nebraska	Sheldon Member of the Topeka Formation, Shawnee Group
Shell Rock Chert				Mottled white to light gray in color. It has light gray colonial corals present.	Minnesota, Iowa
Silurian Chert				Mottled or streaked chert ranging in color from white to a light cream or light gray	Michigan, Wisconsin	Mayville Limestone / Dolomite Formation
Silver Hill Quartzite Hixton Quartzite variant					Minnesota	Revett Formation
Silver Mound Silicified Quartzite Hixton Quartzite variant					Wisconsin	Wonewoc Formation
Sioux Jasper				Ranges in color from a brownish yellow to red	South Dakota, Iowa, Nebraska, Minnesota	Sioux Formation
Sioux Quartzite				Ranges from a light grayish tan to a medium grayish brown.	South Dakota, Iowa, Nebraska, Minnesota	Sioux Formation
Spergen Chert AKA: Spergen Crystalline Saccaroidal Dolomite				Commonly banded or mottled and ranges in color from a very light gray to a gray or brownish gray, and a pale yellow to a tan	Iowa, Missouri, Illinois	Spergen Formation
Sonora Flint AKA for Wyandotte Chert				Vibrant colorful flint that may range from tans to light gray-blue and dark brown to purples	Kentucky, Tennessee, Ohio, Indiana, Illinois	Ste. Genevieve Limestone formation
Spring Branch Chert				Primarily a medium gray chert with darker fossil inclusions. Bluish gray chalcedony vugs may be present.	Iowa, Nebraska	Spring Branch Limestone of the Lecompton Formation
Spring Hill Chert				Strongly mottled and ranges from light to dark gray with dark speckles being present.	Kansas, Missouri, Iowa, Nebraska	Spring Hill Member, Plattsburg Limestone Formation
Spoon Chert				Opaque and ranges from white to light gray with darker banding present	Illinois	Spoon Formation, Kewanee Group
St. David Chert Blair - St. David Chert				Moderately translucent chert that ranges in color from a medium gray to dark bluish gray with brownish mottling and grayish streaks.	Illinois, Missouri	Carbondale Formation of the St. David Limestone
St. Francois Rhyolite				Reddish color	Missouri
St. Louis Green Chert AKA: St. Louis Formation Chert				Varying shades from light gray green to yellow green	Illinois, Indiana, Kentucky, Tennessee, Missouri	St. Louis Formation
Starved Rock Chert AKA: LaSalle Chert Oneota Chert variation				Ranges from white to a light olive gray or gray and from a light brown to a light yellow with darker colored banding.	Wisconsin, Illinois	Lower Prairie de Chien Group, Oneota Formation
Ste. Genevieve Chert AKA: Old Blue Chert				Ranges from light to medium blue, gray, and black, to olive gray and yellowish gray with gray concentric bands commonly present	Illinois, Indiana, Missouri, Kentucky	Ste. Genevieve Limestone Formation
Strawberry Chert					Illinois, Missouri
Stoner Chert Type A and B				Ranges from light to medium gray or a grayish tan with white veins.	Iowa, Nebraska, Missouri, Kansas	Stoner Member of the Stanton Formation, Lansing Group
Swan River Chert				Ranges from a creamy white to gray, pink to a rust, or pale yellow to deep orange, commonly has banding	Ontario, Manitoba, Saskatchewan, Minnesota, North Dakota, South Dakota, Iowa	Souris River Formation, Point Wilks Member
Thunder Mountain Quartzite AKA: McCaslin QUartzite				Grayish color. It is considered a quartz rich graywacke.	Wisconsin, Michigan	McCaslin syncline
Toronto Chert				Homogenous ranging from a white to a pale brown or yellowish brown.	Kansas and into Oklahoma, Iowa, Nebraska, and Missouri	Toronto Limestone Member, Oread Formation of the Shawnee Group
Tongue River Silicified Sediment				Grayish brown sediment, pseudoquartzite, or arenaceous chert	North Dakota, South Dakota, Montana, Nebraska, Minnesota, Iowa	Slope / Bullion Creek formation
Tyler Argillite				Ranges from gray to dark gray in color.	Michigan, Wisconsin	Tyler formation, Baraga Group
Ullin Chert				Brownish gray color	Illinois, Missouri, Kentucky	Ullin Formation
Utica Jewelstone				White with banding of gray and brown.	Illinois
Utley Rhyolite				Grayish black with white intrusions of quartz. Light pink tints may be present caused by feldspars	Wisconsin
Verdi Chert				Light gray to medium brown streaked appearance and ranges in color from a grayish orange to a yellowish gray	Iowa	Verdi Member of the St. Louis Formation, Meramecian Series
Vienna Chert				Ranges from a deep bluish black to a light grayish tan or pinkish	Kentucky, Illinois, Indiana	Vienna Formation
Wapsipinicon Chert AKA for Scotch Grove Chert				Mottled and ranges from a gray to a light tan or brown	Iowa	Scotch Grove Formation, upper Silurian Group
Warsaw Chalcedonic Chert Croton Chalcedonic Chert				Ranges from a pale tan or brownish gray to a medium brown, White streaking is commonly present along with white fossil remnants.	Iowa	Osagen Series
Warsaw Dolomitic Chert				Ranges from a pale tan or brownish gray to a medium brown, White streaking is commonly present along with white fossil remnants	Iowa	Osagen Series
Wassonville Chert A- Fossiliferous B - Mottled				Ranges in color from a very light gray to a medium gray with densely packed fossil fragments.	Iowa	Wassonville Member, Hampton Formation
Waterloo Quartzite				Ranges from a light buff to a red.	Wisconsin
Waukesha Chert				Ranges from white to a bluish white or gray.	Southeastern Wisconsin	Wankesha Limestone Formation
West Franklin Chert				Ranges from a light gray to light bluish gray. Commonly mottled with blue and with light brown streaks and chalky vugs	Indiana, Illinois, Kentucky
West Patricia Chert AKA Green Re-crystalized Chert				Green recrystallized chert that has the appearance of green quartzite.	Ontario
Westerville Chert				Ranges from homogeneous to mottled ranging from a pale brown to a light yellowish brown or brownish yellow and thin bands of white may be present.	Missouri, Kansas	Westerville Limestone Member of the Cherryvale Shale Formation
Wewe Slate				Banded ranging from a gray to grayish green.	Michigan, Wisconsin	Chocolay Group
Winterset Chert AKA: Fusulinid Chert, Zebra Chert				Primarily homogenous, ranging to mottled or layered, ranging from a light to dark gray or brownish gray, opaque may have a "zebra" appearance	Nebraska, Iowa, Missouri, Kansas	Winterset Limestone Member of the Dennis Limestone Formation, Kansas City Group
Wyandotte Chert AKA: Indiana Hornstone, Harrison County Chert				Ranges in color from a medium bluefish gray to a medium light gray. Banding is common and is various shades of gray	Indiana, Kentucky, Illinois, Missouri, Tennessee	Fredonia Member of the Ste. Genevieve Limestone formation
Yankee Town Chert				Ranges in color from a light gray to a pale yellow. Banding may be present, has a "knotty" appearance.	Illinois, Missouri	Yankeetown Chert Member of the Cedar Bluff Group