PROTOZOARIOS SANGUINEOS DE LAS AVES
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Laboratorio de Estudios Médicos y Biológicos, CD MEXICO, DF, MEX
Esculela Nacional Medicina, CD MEXICO, DF, MEX
Esculela Nacional Medicina, CD MEXICO, DF, MEX
Abstract
Describes the pachydonta pelecypod, Toucasia mexicana This and the other fossils (some of which are listed) collected in the marine sediments of the region prove that the beds are of Middle Cretaceous age, perhaps Middle Albian