Eurypterid Fossil Fragment

This fossil is of the prosoma ("head") of an Eurypterid ("sea scorpion"). This specimen was found at the Ridgemount Quarry in Fort Erie, Ontario, Canada. Its identification might be an Eurypterus lacustris (Harlan). This particular fossil was found in the Fiddlers Green Member of the Bertie Dolestone of the Williamsville Formation. This creature probably existed about 423-418 million years ago (upper Silurian Period). See this website for more details.

Thanks to Dave for sending this fossil to me.

Turritella Gastropod of Alabama

About 60 million years ago (or so) during the Paleocene epoch, a towering coiled shell sea gastropod roamed a shallow sea that is now where southern Alabama is in the United States.  Fast forward to the early 1800s, Timothy Abbott Conrad from the Academy of Natural Sciences of Philadelphia spends years studying the shell fossils of Monroe County, Alabama.  His studies result in a book Fossil Shells of the Tertiary Formations of North America which a reproduction of can be found at Google Books website.



The fossil pictures in this post were found in the Gosport Sand or Lisbon Formation of the Paleocene Epoch/Eocene Period. The location was Monroe County, Alabama, USA. This gastropod fossils might be the Turritella mortoni?.  Thanks to Pam and Herb for these fossils. 

Close up of spiral point.

The Inner Atrypa

Above is a diagram of a North African Atrypa reticularis from the Middle Devonian Period.  It is on display at the Museum of Natural History in Paris, France.

This next image is of both sides of a Pseudoatrypa found in the Jeffersonville Limestone of Clark County, Indiana. 

This last picture is another example of the Pseudoatrypa from the same locality though in a little rougher shape.