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Ammonites, 5 species IguanodonThis 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
4 ounces of dinosaur bone fragments
making it one of the most complete ever found in North America
This is probably Charniodiscus concentricus
Thus T-rex had a variety of sizes of teeth
to positive hypo reliefs with concentric ornamentation (Ediacaria preservation)
The coelacanth
Think of it as a baby Archaeopteryx
the volcanoes became active
late Cretaceous (74-83 million years) near Chadron
Aspidella terranovica Billings
with a typical size range of two to seven centimeters (1 to 3� inches)
interesting bone fragment can be seen in the matrix
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