Here are some illustrations of the crinoid fossil
Ichthyocrinus laevis
(Conrad). The fossil was found in the Rochester shale at Erie County,
New York, USA. The fossil dates to the Silurian Period. This fossil is
also found in the Lockport Shale. They were published in
Amadeus Grabau's (1870-1946) book
Geology and Palaeontology of Eighteen Mile Creek and the Lake Shore Sections of Erie County, New York from 1899. The images are from pages 157-158, figure 53.
