The bottom of this crinoid calyx displays an attractive five plate flower pattern. This unidentified calyx is from the Upper Mississippian Period. The fossil was found in Indian Springs Shale Member of the Big Clifty Formation of Crawford County, Indiana. Three specimens are shown in this posting and each fossil is about 1 cm in diameter. UPDATE (2020): These calyx cups might be Phanocrinus or Bicidiocrinus.
Thanks to Kenny for letting me image his fossils for this post.
On a small side note, this is my 900th post. I will now slow down my publishing rate which has been for a while 7 posts a week. My plan is now just publish on Sundays and Mondays which should get the blog to 1000 posts in 2011. If a special occasion or fossil needs to be posted, I will publish outside of this schedule. If I have any daily readers, thank you for your dedication to this fossil blog.
Looking for a daily read, check out the posts on the ever active Fossil Forum and good geology news and nifty info read the GeoBulletin.
