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finding the structure of the jaw with teeth in its natural position is extremely rare
the fossil record of these enormous vertebrates is very well represented
Acastellina
Protoginglymostoma
20380 - Nice Pink Erythrite Crystals on Matrix - Bou Azzer Mine (South Morocco) Notidanodon finding the structure of theErythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula (Co3(AsO4)28H2O). Erythrite and annabergite (Ni3(AsO4)28H2O) (nickel arsenate) form a complete series with the general formula (Co,Ni)3(AsO4)28H2O. Erythrite crystallizes in the monoclinic system and forms prismatic crystals. The color is crimson to pink and occurs as a secondary coating known as cobalt bloom on cobalt arsenide minerals. Well formed crystals are