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Featured Fossil Archive

 

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

The Last Featured Fossil....

 

Crinoid column coated with pyrite crystals from the Silurian Waldron Shale

Fossil Type:

Pyrite-Coated Fossil

Name:

Crinoid Column

Formation:

Waldron Shale

Age:

Wenlockian, Middle Silurian

Location:

Clark Co., Indiana

Notes:

Fossils may be replaced by pyrite (pyritized) or encrusted by the mineral. With the former, the fossil takes on the composition of the iron sulfide, with the latter it coating in crystals. The triangular metal reflections are indicative of the octahedral crystal habit. Anonymous collection. Specimen is about 2 cm long.

Date Posted:

July 25, 2016

 

Archived Featured Fossils are now organized by geological time period - youngest to oldest.

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 July 29, 2016