09131 - Great Association of 2 OPHIURA SP Brittlestars Upper Ordovician - Ktaoua Fm Nematonotus longispinus Comments: Approved 11 Oct 2019

Comments: Approved 11 Oct 2019 Writeup Writeup from MB 108:

the reabsorption of the olivines and the pyroxenes overgrowth indicate a complex evolution of the magma

Northwest Africa 12778 (NWA 12778)

Unlike most other chondrites

09131 - Great Association of 2 OPHIURA SP Brittlestars Upper Ordovician - Ktaoua Fm Nematonotus longispinus Comments: Approved 11 Oct 2019Size (Biggest): 128. 2 mm 5. 10 in Beautiful preserved and well prepared specimens. This type of brittlestar is quite representative of the Ordovician of the South of Morocco. Its orange colors come from the limonite (iron oxide) that is the product of the oxidation of the original pyrite that mineralized these fossils.