Wednesday, December 1, 2010

Dolatocrinus Crinoid Stem Piece

Finally, a crinoid stem that can be identified at least to the genus name!  This Middle Devonian Period crinoid fossil is a Dolatocrinus known by those flange pieces protruding off the stem.  There are quite a few species of Dolatocrinus as shown on this Falls of the Ohio State Park fossil web page

A small booklet entitled Middle Devonian Type Jeffersonville Limestone at the Falls of the Ohio by James E. Conkin, Barbara Conkin, and Larry Steinrock published in 1998 defines the stratigraphy of where this fossil can be found on page 9.  The figure on the page shows it to be from the upper part of the Jeffersonville Limestone (33+ feet thick) in the Paraspirifer acuminatus zone (17.5 feet).  It further narrows it to the Elaeacrinus verneuili zone.

Fossil was found in Jefferson County, Kentucky.

1 comment:

Dave said...

That is a nicely preserved stem section! I've found bits and piece of the same genera at Arkona but not as well articulated or intact.