07230 - Top Huge 4.20 Inch Clypeaster subdepressus (Sea Urchin) Upper Pliocene Ceratodus humei irregularly shaped shrapnel pieces

irregularly shaped shrapnel pieces

buildup or bioherm

Drumheller

Donald (1986): Halisaurus and Prognathodon

It comes from The Konservat-Lagerstätten of Lower Fezouata Fm that spans the entire Tremadoc stage of the Ordovician system and is only present in the Moroccan Anti-Atlas

07230 - Top Huge 4.20 Inch Clypeaster subdepressus (Sea Urchin) Upper Pliocene Ceratodus humei irregularly shaped shrapnel piecesNice specimen. It only has some glued fractures. Clypeaster sp, Lamarck 1801 (sand dollar) Echinoidea Clypeasteroida Clypeasteridae Parent taxon: Clypeasteridae according to S. K. Donovan et al. 2005 See also Durham 1961, Durham 1966, Ragaini 1994 and Sepkoski 2002 Sister taxa: Ammotrophinae, Arachnoidinae, Clypeasterinae Ecology: slow moving semi infaunal detritivore Age range: 37. 2 to 0. 012 Ma