Connecting the environment of the ancient past with the natural and cultural history of yesterday and today.



Featured Fossil


This page features a fossil with details about the specimen, its age,

where it was found, and a nugget of interesting information. Not every

specimen will be perfectly preserved - but all are a marvel of the natural world!

All geological time periods are represented.


Pennsylvanian demosponge Coelocladia spinosa from Oklahoma

Fossil Type:



Coelocladia spinosa Girty




Missourian, Upper Pennsylvanian


Bardew Lake, Washington Co., Oklahoma


Fossil sponges of Class Demospongea have a wide distribution in the fossil record dating back to the Cambrian Period. Dominantly marine, any modern freshwater sponge is a demosponge. This narrow specimen shows hollow pores called a ostiums. Anonymous collection. Click here for another view. FOV = 2.5 cm

Date Posted:

May 25, 2016


Archived Featured Fossils

Archived images are now arranged in each category by geological time period.

How to Submit a Featured Fossil

Created April 12, 2012