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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Discovery of fossil-bearing, cherty limestone of Mississippian age in the Nacimiento and San Pedro mountains of north-central New Mexico indicates a greater extent of Mississippian marine invasion than has heretofore been widely accepted. Among the fossils the best preserved and most diagnostic are brachiopods of probable Meramec age. They represent the first important discovery of pre-Pennsylvanian megafossils in northern New Mexico, in an area extending 200 miles from the Ladron Mountains of central New Mexico to the Piedra River Canyon of southern Colorado. The formation in which the fossils occur is discontinuous, preserved only as isolated erosional remnants. The most complete section observed, and the best fossil locality, is in Arroyo Penasco in the San Ysidro Quad angle, Sandoval County, New Mexico. It is proposed that the formation be called the Arroyo Penasco formation.
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