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1	Small Vertebrates of the Bidahochi Formation, White Cone, Northeastern Arizona Baskin, Jon Alan January 1975 (has links) Two taxa of amphibians, five taxa of reptiles, and eighteen taxa of mammals were collected by screen-washing sediments from the upper Bidahochi Formation at White Cone peak, northeastern Arizona. Five new species of mammals were recovered. They include Perognathoides bidahochiensis (Heteromyidae), Bensonomys yazhi (Cricetidae), Bensonomys bradyi (Cricetidae), Paronychomys alticuspis (Cricetidae), and Martes (Plionictis) repenningi (Mustelidae). Bensonomys yazhi and Bensonomys bradyi are close to the stem of Central and South Americal hesperomyine radiation. The radiation began in the southwest United States and Mexico during the Hemphillian. The middle member of the Bidahochi Formation is dated at 6.7 m. y. by a basalt from Roberts Mesa. The paleomagnetic data and the White Cone local fauna support this middle Hemphillian date. Amphibia Arizona Bensonomys Bidahochi Formation Carnivora Cenozoic Chordata Cricetidae Eutheria faunal studies Hemphillian Heteromyidae Mammalia Martes Miocene Mustclidae Myomorpha Neogene new taxa northeast occurrence paleontology Perognathoides Pliocene radiation Reptilia Rodentia Tertiary Tetrapoda Theria United States Vertebrata White Cone Paleontology -- Arizona -- White Cone Vertebrates -- Arizona -- White Cone Vertebrates, Fossil