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Featured Fossil Archive

 

This page links to past Featured Fossils of all geological time periods.

The Last Featured Fossil....

 

Sea urchin Archaeocidaris with spines preserved

Fossil Type:

Echinoid

Name:

Archaeocidaris sp.

Formation:

Indian Springs shale Member, Big Clifty Fm.

Age:

Chesterian, Upper Mississippian

Location:

Crawford Co., Indiana

Notes:

A small cidaroid echinoid, this specimen is somewhat crushed, but has  spines only somewhat displaced from the socket plates. To learn more about the genus Archaeocidaris, click here. Specimen is about 2.5 cm across.

Date Posted:

April 22, 2014

 

Invertebrates

      Micro-fossils          Worms          Arthropods: Non-Trilobite          Trilobites

Brachiopods                    Bryozoans                    Porifera (Sponges) 

Corals:               Rugose                    Tabulate                    Scleractinian

Echinoderms: Crinoids                    Echinoids & Asteroids             Extinct Classes

Mollusks: Bivalves               Cephalopods               Gastropods               Other Mollusks

            Graptolites

Vertebrates

Fish                           Mammals                 Reptiles

 

Plants

Algae                 Ferns & Horsetails / Primitive Plants           Angiosperms & Gymnosperms

 

Trace Fossils       Miscellaneous

Featured Fossil Home Page

 

Created April 13, 2012, updated April 23, 2014.