Pennsylvanian Fossils
Named for deposits in the state of Pennsylvania, sequences of coarse to fine material with layers of coal along with evidence of repeated ice ages in the southern hemisphere indicate that sealevel rose and retreated many times during the 34 million years of the Pennsylvanian period.
Minturn Formation, Eagle, Colorado
I came across a road cut near Eagle and spend about two hours collecting. There was a layer of limstone over a very friable shale. I interpreted this as a coral reef with a lagoon.
First from the limestone, crinoids, bryozoa, and brachiopods. Notice in the second specimen what looks like a wire about an inch long in the bottom middle. See the brachiopods below.
