Crocodilian eggs from the middle Eocene Bridger Formation, Wyoming

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Abstract
Four nearly complete eggs from the middle Eocene Bridger Formation (Wyoming) are assigned to the crocodiloid basic organizational group. Similarity in egg shape and size and in the histological structure of the eggshell with Crocodylus johnstoni and Crocodylus porosus justifies this classification. The biocrystalline layer of the crocodilian eggshell is composed of a zone of shell units formed of fairly coarse wedges of tabular crystalline structure rising from the inner zone of basal plate groups. Diagenetic features of the specimens include a secondary deposit of calcite on the surface, the infilling of the eggs with fine-grained sediment, and the precipitation of calcite and quartz crystals lining a geode-like cavity. Embryonic remains were not detected.