Submitted by: David Thompson
Taxon: Microcyclus thedfordensis, Pleurodictyum (procteria) cornu
Submit date: 2007-03-08
Location (approximate): Milan, Washtenaw, MI
Stratigraphy: Silica Formation
Age: Erian (Middle Devonian)
Submitter notes: This image compares the structure & size of Microcyclus thedfordensis with the small corals, Pleurodictyum (Procteria) cornu from the Michigan Silica formation. A. is an example of the Microcyclus from the Thedford area of Ontario, B. shows three examples of the Pleurodictyum, two with the upper multi-coralite side showing & the third showing the under side of another example. Unlike the Microcyclus, the Pleurodictyum does not start by attaching to anything. C. is a slightly larger example of the Pleurodictyum from the Bell Shale in Rockport, MI. Mike Toper has other examples on this site of Microcyclus. The U.S. ten cent piece is for scale.