Mississippian Fossils

The Mississippian is the lower part of the Carboniferous, the period that produced the coal fields in England, Pennsylvania and West Virginia. Reptiles make their first appeareance with eggs they could lay on dry land. The Carboniferous lasted from 359 to 299 million years ago.

Fossil
 

 

Lakeside Mountains

Lakeside Mountains lie along the southwest shore of the Great Salt Lake in Utah.

Here are two horn coral, one cone-shaped, the second more columnar. In either case, the internal radiating septa are evident.

Horn coral are belong to a group of corals referred to as "rugose." They may be solitary or colonial. There are more rugose coral below from Tennessee.



Clarksville, Tennessee

St. Lewis Limestone


This coral shows two individuals growing together.

This is a colonial species.

This specimen is an unbroken example of the same colonial species.

This is a Bellerophon. Some authorities group bellerophons with gastropods, others consider them a separate phylum.

A small gastropod

My first and only blastoid.

Lacey bryozoa #1

Lacey bryozoa #2

Lacey bryozoa #3

A brachiopod

Crawsfordsville, IN

The Borden Group of siltstone and limestone around Crawsfordsville is world famous for crinoids. Dark gray fossils on a light gray background are spectacular. The first image I borrowed from americangeode.com. The specimen is in the Indiana State Museum. The next two I collected as cobbles in Sugar Creek northeast of Crawsfordsville.



A portion of a very large calix

Broken stem pieces. Each stem piece is a single crystal of calcite.