A 'carnelian' crinoid from Alpena

Submitted by: David Thompson
Taxon: Megistocrinus rugosus
Submit date: 2007-03-09
Location (approximate): Alpena, Alpena, MI
Stratigraphy: Four Mile Dam Formation
Age: Erian (Middle Devonian)
Submitter notes: This example of Megistocrinus rugosus crinoid caylx shows how at times mineral replacement can be of a rich red Calcite, making a nice fossil more attractive. This was collected at a bioherm or fossil 'reef' in a quarry. This shows the stem base, the upper tegman is complete also.

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