Gehrig, J. L. (1958). Middle Pennsylvanian Brachiopods From the Mud Springs Mountains and Derry Hills, New Mexico. New Mexico Bureau of Mines and Mineral Resources, Memoir 3, pp. 1-24, 6 plates.

506237

Gehrig, J. L.

1958

New Mexico Bureau of Mines and Mineral Resources, Memoir 3, pp. 1-24, 6 plates.

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A brachiopod fauna from carefully measured sections of the lower part (Derry and Des Moines series) of the Pennsylvanian in Sierra County, New Mexico, was studied to determine if the megafossils could be useful in designating and correlating the various units of the Pennsylvanian in this area. It was found that strata belonging to the Derry and the Des Moines series could be distinguished on the basis of the contained brachiopod species. Several characteristic species from the Derry, which is believed to be younger than the Morrow of the midcontinent region, are similar to upper Mississippian forms. Brachiopods of the Bolander group in the upper part of the Desmoinesian show close affinities with those of the Marmaton group of Kansas. It thus appears that both megafossils and microfossils can be used successfully to distinguish groups and series in the Pennsylvanian of New Mexico.

Brachiopoda

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