Mississippian - Warsaw Formation
St. Louis County, Missouri
Click on picures to view specimen AFTER prepared
Collected at the contact between the limestone and soft shale
The Platyceras gastropods lived in a symbiotic association with crinoids.
Platyceras attached and scavenged directly off the crinoid calyx, perhaps
feeding off the ejected material from the anal tube.
I have collected a number of very nice (mostly weathered out of matix)
specimens at this locality and will post those pictures in the near future.
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