Fossil Nonmarine Ostracoda of the United States by Frederick M. Swain

By Frederick M. Swain

The geographic and stratigraphic distribution of fossil nonmarine Ostracoda within the usa are summarized during this booklet, through diagnoses of the topic species, references to literature and 34 plates of illustrations.This paintings indicates the nice range and value of this fascinating category of organisms that are small bivalved aquatic crustaceans that occupy either marine and nonmarine environments. Many are attribute of estuarine and different tidal habitats, yet just a couple of occupy hypersaline waters. One or forms are present in rainy soils, or in leaf or flower cups in tropical rain forests. a number of reside in caves and others are commensal in gills of fish and different aquatic animals. Micropaleontologists have stumbled on their shells in lots of forms of sedimentary rocks and feature used them for stratigraphic and paleoenvironmental interpretations.Their quite fast charges of evolution have made them beneficial in subsurface stratigraphy and their sensitivity to environmental adjustments has supplied a way of spotting adaptations in rock facies. In nonmarine aquatic rocks they're typically the main simply recoverable microfossils, and feature been familiar in petroleum exploration, significantly in China, Russia, Brazil and the western usa.

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Cyprinotus sp. aft. C. cingalensis, a unique dorsally umbonate species, was found only in the middle Humboldt Formation in the Cobre, Nevada section. Pactolocypris laevis marks the upper part of the Humboldt in several northeastern Nevada sections. One of the principal Humboldt species Cypricercus toanoensis does not occur as high in the formation as does P. laevis in the Medicine Creek, Winecup Ranch and Cobre areas, but lies in the upper part of the formation in the Wilkins Ranch No. 2 well, just beneath the Hay Ranch Formation.

The following were identified: Candona cf. simpsoni Sharpe, C. cf. cachensis Swain, Pontoniella sp. ~and Cypricercus cf. egantulus Swain. C. simpsoni is known from Pleistocene to Recent, C. cachensis is from the Pliocene, Pontoniella sp. resembles a Pliocene form and C. elegantulus occurs in the Miocene or late Oligocene. No definite age assignment can be made for the collection at present. Oligocene-Miocene Renova Formation, Montana Lacustrine deposits of the Arikareean Renova Formation, Passamari Member, in the Ruby Basin, southwestern Montana, yielded a unique foraminiferal and ostracodal assemblage (Van Nieuwenhuise and He, 1986).

Aff. C. cinglaensis Brady Cyprinotus? sp. 1 Cyprinotus sp. 2 Genus Heterocypris Heterocypris blairensis Swain and Wagoner Genus Hemicyprinotus Hemicyprinotus? simplex, Swain Hemicyprinotus ? sp. Genus Pactolocypris Pactolocypris suborbicularis attenuatus, Swain Pactolocypris cf. suborbicularis suborbicularis Swain Pactolocypris biprojectus Swain Pactolocypris laevus, Swain Pactolocypris cancellatuspronodosus, Swain Family Cypridopsidae Subfamily CYPRIDOPSINAE 26 Genus Cypridopsis Cypridopsis ? sp.

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