A Nautiloid Cephalopod, found in middle Pennsylvanian strata (Marmaton Group). This specimen was uncovered during the excavation of I-170 at its intersection with I-70 in the vicinity of Berkeley in north St. Louis County. (Collection of Bruce Stinchcomb, Ferguson, Mo.)
This webpage by Scott K. Williams of Florissant, Mo. Copyright 1999, All Rights Reserved.