Coiled Crinoid Stem Fossil

 

These pictures are of a coiled crinoid fossil. It was found in the Waldron Shale of Clark County Indiana USA. The fossil dates to the Silurian Period.

Agassizocrinus? Crinoid Fossil

 

In 2012, I posted a crinoid calyx fossil which was identified as a Phanocrinus nitidus. Recently, I revisited this fossil and took some new pictures of what might be an Agassizocrinus. The matrix it is in also contains a very nice Archimedes bryozoan and an unknown brachiopod. The specimen was found in southern Indiana, USA and dates to Mississippian Period. The crinoid is about 3 cm in length.

Cactocrinus? Crinoid Fossil Stem

It is usually difficult to identify fossil crinoid stem pieces. So this fossil was recently found in the Jeffersonville Limestone Clark County Indiana USA. It dates to the Middle Devonian Period. The stem has some unique features so it seemed like a good candidate for trying to find its name. After some research, this fossil might be a Cactocrinus. A problem emerges in that that genus existed in the Mississippian Period and this fossil was found in much older rock.