Isotelus Pygidium Fossil

 

In this picture is an Isotelus (Dekay, 1824) trilobite pygidium fossil next to little ringed funnel shapes which are the fossilized remains of a worm called Cornulites (Schlotheim, 1820). The small brachiopods in the matrix are Zygospira (Hall, 1862) fossils. Fossil plate was found at a roadcut near Frankfort, Kentucky, USA. The fossils date to the Ordovician Period.

Thanks to Kenny for image.

Zeacrinites wortheni Crinoid Calyx Fossil

This picture is a recent fossil find from the Glen Dean Member of Grayson County, Kentucky USA. It is a crinoid calyx fossil that appears to be a Zeacrinites wortheni (Hall, 1858). The fossil dates to the Mississippian Period. Thanks to Kenny for the image.

Tholocrinus spinosus Calyx Crinoid Fossil

These pictures are of a recent fossil find from the Glen Dean Member of Grayson County, Kentucky USA. It is a crinoid calyx fossil that appears to be a Tholocrinus spinosus (Wood, 1909). The fossil dates to the Mississippian Period.  Thanks to Kenny for the images.

 

In 1909, Elvira Wood (1865-1928) published A Critical Summary of Troost's Unpublished Manuscript on the Crinoids of Tennessee. On page 93, she names a new crinoid species Hydreionocrinus spinosus after the fossil by Wetherby who described it in 1881 as Hydreionocrinus depressus found by Troost. She writes that Wetherby had actually found a new species and thus she names it. It's genus was later changed to Tholocrinus (Kirk, 1939).