Lower Eo-Triassic stratigraphy, western Wyoming and southeast Idaho

Newell, Norman D.; Kummel, Bernhard

doi:10.1130/gsab-53-937

Cited by 57 publications

(76 citation statements)

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“…Circumpacific domain: Early Triassic: Wyoming and Idaho (United States) (Newell & Kummel, 1942), Alberta (Canada) (Newell & Boyd, 1970), Japan (Nakazawa, 1971;Hayami, 1975); Induan of Nevada (United States) (Ciriacks, 1963;Schubert, 1993;Newell & Boyd, 1995;Schubert & Bottjer, 1995;Boyer, Bottjer, & Droser, 2004;Fraiser & Bottjer, 2007a, 2007b.…”

Section: Genus Pseudoplacunopsis Bittner 1895 P 215mentioning

confidence: 99%

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A Late Permian to Early Triassic Bivalve Fauna From the Dongpan Section, Southern Guangxi, South China

Feng

Weldon

et al. 2007

Journal of Paleontology

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Section: Genus Pseudoplacunopsis Bittner 1895 P 215mentioning

confidence: 99%

“…Circumpacific domain: Early Triassic: western United States and Japan (Newell & Kummel, 1942;Ciriacks, 1963;Schubert, 1993;Newell & Boyd, 1995;Boyd, Nice, & Newell, 1999;Fraiser & Bottjer, 2007a), Japan (Nakazawa, 1961(Nakazawa, , 1971Hayami, 1975;Kashiyama & Oji, 2004).…”

Section: Genus Pseudoplacunopsis Bittner 1895 P 215mentioning

confidence: 99%

A Late Permian to Early Triassic Bivalve Fauna From the Dongpan Section, Southern Guangxi, South China

Feng

Weldon

et al. 2007

Journal of Paleontology

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“…Generally speaking, Lingularia is long-ranging and appears to have favoured dysoxic environments in the late Paleozoic. Lundgren, 1883;Bittner, 1899;Wittenberg, 1910;Newell and Kummel 1942;Dagys, 1965;Rowell, 1970;Broglio Loriga et al, 1980;Dagys and Kurushin, 1985;Campbell, 1987;Biernat and Emig, 1993 .…”

Section: Sample Materialsmentioning

confidence: 99%

四国の三畳系層状チャートから産出した<i>Lingularia</i> sp. (腕足類)

利栄¹,

キャンベル²

2004

Jour. Geol. Soc. Japan

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“…Schultz in 1914 used the name Park City in the Salt River and Wyoming ranges, applying it to strata lying above the Weber quartzite and below a sequence of red beds. He thereby included beds at the top which are now placed in the Triassic Dinwoody formation, a tune correlative of the Woodside formation of Utah (Newell and Kummel, 1942). Mansfield in 1916 reassigned the lower portion of the beds in the Salt River Range to the Phosphoria formation.…”

Section: Review Of Nomenclaturementioning

confidence: 99%

“…20) and the basal, buff to tan thin-bedded calcareous siltstone of the Dinwoody formation. In western Wyoming, Newell and Kummel (1942) have divided the Dinwoody into three units which, from base to top, are: the basal siltstone, the Lingula, zone, and the Claraia zone. They postulate overlap of the upper beds Over the lower to the east arid suggest, therefore, that the Dinwoody unconformably overlies the Phosphoria in the eastern part of the area.…”

Section: Unit Ementioning

confidence: 99%

Physical stratigraphy of the Phosphoria formation in northwestern Wyoming

Sheldon¹

1957

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The rocks of the Ph'osphoria formation in northwestern Wyoming fall into five stratigraphic units, which, from oldest to youngest, are provisionally called the A, B, C, D, and E units. Units A, C, and E are composed dominantly of chert, carbonate rock, and sandstone, whereas units B and D are composed dominantly of mudstone, phosphorite, and dark carbonate rock. Units C and D are continuous over all of northwestern Wyoming, whereas unit A grades into unit B and unit -E grades into unit D to the southwest. Both units A and B pinch out to the north. . With the possible exception of unit A, these units can be recognized in southwestern Montana. Units B, C, and D are. equivalent to the phosphatic phale, Rex, and upper shale .members of the Phosphoria formation in southeastern Idaho. The formation as a whole exhibits a facies change from dominantly chert, mudstone, and phosphorite in the southwestern part of northwestern Wyoming, to dominantly Carbonate rock and sandstone in the northeastern part. The facies change with thinning and pinching out of units and the intergradation of units, " ... . -. The rocks of the formation in the area of the report are cyclically deposited. The rock record of a single ideal cycle consists, from base to top, of carbonate rock, chert, phosphorite, chert, and carbonate rock. Sandstone and glauconite in general are found in the carbonate phase of the cycle, whereas mudstone, pyrite,.and organic matter are found in the chert and phosphorite phases of the cycle. An eastward facies transition from phosphorite to chert and chert to carbonate rock is analagous to the upper half of the cycle, which is: phosphorite, chert, and carbonate rock in ascending order. The phosphorite phase of the cycle is represented by units B and D, whereas the other phases are represented by units A, C, and E. Two complete cycles are found in southwestern Wyoming.These stratigraphic relations represent two transgressions and regressions of areally zoned environments. The phosphorite phase is the more transgressive; the carbonate rock phase is the more regressive. The physical-chemical environments in which the sediments accumulated probably varied between an environment with a pH of above 7.8 and an Eh of greater than zero for the carbonate rock phase of the cycle, and an environment with a pH of less than 7.8 and an Eh of less than about 0.25 for the phosphorite phase of the cycle. These 105 106 CONTRIBUTIONS TO ECONOMIC GEOLOGY environments probably were effected by an upwelling of cold water on a shelf to the east. The transgressive and regressive migrations of the shelf probably were tectonically controlled.

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Lower Eo-Triassic stratigraphy, western Wyoming and southeast Idaho

Cited by 57 publications

References 0 publications

A Late Permian to Early Triassic Bivalve Fauna From the Dongpan Section, Southern Guangxi, South China

A Late Permian to Early Triassic Bivalve Fauna From the Dongpan Section, Southern Guangxi, South China

四国の三畳系層状チャートから産出した<i>Lingularia</i> sp. (腕足類)

Physical stratigraphy of the Phosphoria formation in northwestern Wyoming

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