Color: Spring Branch Chert is primarily a medium light gray to a medium
dark gray chert with darker
fossil inclusions. May range to a light brownish gray. Other
varieties may range from a dark brownish gray to a black with yellowish
brown mottling..
Bluish gray chalcedony vugs may be present.
Heat Treatment: Heat treatment gives a slight
reddish gray color change and improves luster.
Knapping:
Distribution:
Distribution Comments:
Spring Branch Chert is associated with the Spring Branch Limestone of
the Lecompton Formation
of southwestern Iowa. Primary outcroppings occur in Mills and
Montgomery counties, Iowa.
Projectile point made from this material:
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