Hi @charles-smith, what a wonderful diagram of this fossil! The only thing this needs is a scale as well! @david-clark might be able to help you narrow down the identification!

What an interesting specimen! Jimbacrinus is a Permian crinoid only found in Australia. I think this may be a columnal or stem that was infected and bulged. This specimen has no obvious small tegmen plates (top of the calyx) or anal tube. It’s also curious if it only has 4 holes on the sides. If they were arms, it’s usually in multiples of 5. The…[Read more]

Good News! Thanks to the observations and research done by David Clark of Howell, MI and Mark A. Wilson, a professor of Geology at the College of Wooster, Ohio, this crinoid stem piece has been identified as a swollen crinoid columnal due to parasitism by some unknown soft-bodied organism. The length of the piece is 2.60 CM and the diameter is…[Read more]