Coelacanth fishes from the continental Triassic of the western United States. American Museum novitates ; no. 2036

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dc.contributor.authorSchaeffer, Bobb, 1913-en_US
dc.contributor.authorGregory, Joseph Tracy, 1914-en_US
dc.date.accessioned2005-10-06T17:02:51Z
dc.date.available2005-10-06T17:02:51Z
dc.date.issued1961en_US
dc.description18 p. : ill. ; 24 cm.en_US
dc.descriptionIncludes bibliographical references (p. 17-18).en_US
dc.description.abstract"There is now conclusive evidence that coelacanths are present in both the lower and the upper Triassic continental beds of the western United States. The scarcity of their remains is, in part, related to the factors that are responsible for the general rarity of fishes in these formations. The broad, flat, flood-plain environment in which the Moenkopi and Chinle-Dockum sediments were deposited (McKee, 1954; Stewart et al., 1959) was apparently more favorable for the preservation of terrestrial than of aquatic vertebrates. Metoposaur and phytosaur remains are much more abundant and more widely distributed than fish remains. The latter are restricted, as might be expected, to channel and lacustrine deposits. Although isolated actinopterygian scales are reasonably common in such deposits, associated fish remains are extremely rare. At a few localities in the Chinle complete fishes have been found in great abundance. These usually occur in lacustrine deposits in concentrations suggestive of periodic mass mortality. The apparent rarity of coelacanth remains in these concentrations suggests that they were not common in the lakes and ponds of the Chinle flood plain. On the other hand, there is no positive evidence that they were, in general, restricted to rivers and streams. Except for the Moenkopi occurrence, which is quite clearly fluviatile, the paleoecologic picture is unsettled. Isolated coelacanth bones from the Moenkopi formation include distinctive basisphenoids, the morphology of which provides the basis for establishing a new genus and species, Moenkopia wellesi. Specimens thus far recovered from the late Triassic Dockum and Chinle formations are too incomplete to permit generic identification"--P. 15-17.en_US
dc.format.extent2382731 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/3465
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, N.Y. : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 2036en_US
dc.subject.lccQL1 .A436 no.2036, 1961en_US
dc.subject.lcshCoelacanthiformes, Fossil -- West (U.S.)en_US
dc.subject.lcshFishes, Fossil -- West (U.S.)en_US
dc.subject.lcshPaleontology -- Triassic -- West (U.S.)en_US
dc.subject.lcshPaleontology -- West (U.S.)en_US
dc.titleCoelacanth fishes from the continental Triassic of the western United States. American Museum novitates ; no. 2036en_US
dc.title.alternativeFishesen_US
dc.typetexten_US

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