3-D Onychocrinus Crinoid Fossil

Sweet Christmas! (any guesses to what I have been watching?) My cousin found this de-articulated crinoid stem and partial calyx/arms fossil. He spent over 6 hours piecing it back together to form this 3-D display. The fossil pictured appears to be a Onychocrinus sp crinoid fossil. It was found in the Glen Dean Formation of Grayson County, Kentucky, USA. The fossil is almost 5 cm wide and a view from the top shows pinnules. This extinct creature dates to Chesterian, Upper Mississippian Period.

Thanks to Kenny for the images.

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