Pterotocrinus Crinoid Fossil

The fossil pictured appears to be a Pterotocrinus depressus (Lyon and Casseday, 1860) crinoid calyx. It was found in the Glen Dean Formation of Grayson County, Kentucky, USA. The fossil is about 2 cm wide. This animal dates to Chesterian, Upper Mississippian Period.

Thanks to Kenny for the image.

See more images of crinoids like this at Don R. Chesnut's web page on fossils of the Sloans Valley Member (Paragon Formation).

http://www.uky.edu/OtherOrgs/KPS/stratigraphicfauna/sloansvalleymacrofauna/pages/sloansvalleyechinodermata.html

Zeacrinites Crinoid Calyx

Here is a picture of one sweet find. It appears to be a Zeacrinites wortheni (Hall, 1858) crinoid calyx fossil. It was found in the Glen Dean Formation of Grayson County, Kentucky, USA. The fossil is about 2 cm tall and consists of the calyx cup, arms and even some of the pinnules. The creature dates to Chesterian, Upper Mississippian Period.

Curious about how Zeacrinites Troost, 1858 was named? Check out this post to learn more: http://louisvillefossils.blogspot.com/2016/01/zeacrinites-wortheni-crinoid-calyx.html

Thanks to Kenny for the image.

See early finds here:

http://louisvillefossils.blogspot.com/2016/01/zeacrinites-wortheni-crinoid-calyx.html

http://louisvillefossils.blogspot.com/2015/08/zeacrinites-wortheni-crinoid-calyx_8.html

 http://louisvillefossils.blogspot.com/2015/08/zeacrinites-wortheni-crinoid-calyx.html 

Trimerus Trilobite from England

One my favorite places in the British Natural History Museum is the small wall display of Fossils from Britain. It is located in between their world class collection of marine reptiles and one of the gift shops. It has a sampling of a lot of Paleozoic invertebrate fossils like what I find in the Louisville area. My interest in Middle Silurian marine fossils was well represented in their Wenlock series which is very similar to the Waldron Shale.

This posting shows a almost fully intact Trimerus delphinocephalus (Green,1832) prone trilobite. It was found in the Silurian Period Wenlock series of Dudley Worcestershire England. Image taken August 2016.

It is similar to what I have found in the Waldron Shale.

http://louisvillefossils.blogspot.com/2013/05/cleaned-silurian-trimerus-trilobite.html