Ammonites, 5 species Iguanodon late Cretaceous (74-83 million years)

late Cretaceous (74-83 million years) near Chadron

interesting bone fragment can be seen in the matrix

Aspidella terranovica Billings

making it one of the most complete ever found in North America

the volcanoes became active

Ammonites, 5 species Iguanodon late Cretaceous (74-83 million years)This 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