L-1178 (Vanport Chert) Vanport Chert, also known as Flint Ridge (OH), is smooth chert. It is every natural color and countless combinations, but black in uncommon. Thermal alteration does not produce ...

Donor Name Estate Of John D. Holland Notes L-530 (Vanport Chert): Direct collection from outcrop. Collection includes raw material, modern flint-knappers' work, heat-treated specimens. L-530 (Vanport ...

Silicification is a diagenetic process that can affect the fidelity of trace fossil preservation. The combination of compaction and oversilicification associated with chert precipitation can alter the ...