Ammonites, 5 species Pachycephalosaurus This is the largest Ammonite

This is the largest Ammonite cast available on the web

it has been tentatively identified as Baryphracta deponiae

front part of the body was made up of a series of connecting plates of bone

an orthorhombic system with acicular crystals

Ammonites, 5 species Pachycephalosaurus This is the largest AmmoniteThis wonderful mortality plate has 5 species of ammonites. Placenticeras intercalare 8. 5 inches across Baculites compressus cuneatus Holoscaphites landesi Jeletzkytes brevis Rhaeboceras halli They are from the Upper Cambrian, Fox Hills Formation of South Dakota, USA The largest ammonite, Placenticeras is 8. 5 inches across. This specimen is a composite. It is meant to be a study of species which may be found loose or in the mud balls found along the