Cambrian formations and sections in part of Cordilleran trough

Deiss, Charles

doi:10.1130/gsab-49-1067

Cited by 27 publications

(45 citation statements)

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“…At the type section it originally included in its lower part limestone and shale of Middle Cambrian age, which probably constitute the upper part of the Gros Venire formation as that formation was defined by Blackwelder (1918), and limestone of Late Cambrian age in its upper part. Inasmuch as the Gallatin limestone, in its restricted sense, contains only strata of Late Cambrian age and is therefore not completely representative of the type Gallatin as originally defined, Deiss (1938Deiss ( , p. 1104 applied the term Boysen formation for the l Tpper Cambrian rocks in Wind River Canyon. That name, although extended into the Gros Yeiitre Range by Foster (1947Foster ( , p. 1547, has not gained wide acceptance.…”

Section: Gallatin Limestonementioning

confidence: 99%

Geology of the Du Noir area, Fremont County, Wyoming

Keefer¹

1955

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Method of structure contouring. ______________ Wind River Range.____________________________ Synclinal basin structures___ __________________ Washakie Range_______________-__-____-_-_ Summary of Late Cretaceous and early Tertiary events. Geomorphology _ _ __________________________________ Erosion cycles_______________________________ Black Rock cycle__-________________________ Circle cycle-______________________________ Lenore cycle_ _____________________________ Postglacial erosion. ______________!_________ Glacial stages ________________________ Buffalo stage_ _______________________ Bull Lake and Pinedale stages. ________ Economic geology._ ___________________ _________ Oil and gas___________________________________ Coal.

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Section: Gallatin Limestonementioning

confidence: 99%

Geology of the Du Noir area, Fremont County, Wyoming

Keefer¹

1955

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“…The Middle Cambrian to Lower Ordovician stratigraphy of Montana and Wyoming has been studied for more than 100 years and given a plethora of lithostratigraphic names (Peale, 1890, 1893; Blackwelder, 1918; Deiss, 1936, 1938; Dorf & Lochman, 1940; Mills, 1956; Goodwin, 1961; Martin et al ., 1980). Two of the more frequently applied formation names for the uppermost Cambrian and basal Ordovician strata in this succession are the Gallatin Formation and Snowy Range Formation.…”

Section: Introductionmentioning

confidence: 99%

Flat‐pebble conglomerate: its multiple origins and relationship to metre‐scale depositional cycles

et al. 2004

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Carbonate flat-pebble conglomerate is an important component of Precambrian to lower Palaeozoic strata, but its origins remain enigmatic. The Upper Cambrian to Lower Ordovician strata of the Snowy Range Formation in northern Wyoming and southern Montana contain abundant flat-pebble conglomerate beds in shallow-water cyclic and non-cyclic strata. Several origins of flat-pebble conglomerate are inferred for these strata. In one case, all stages of development of flat-pebble conglomerate are captured within stormdominated shoreface deposits of hummocky cross-stratified (HCS) fine carbonate grainstone. A variety of synsedimentary deformation structures records the transition from mildly deformed in situ stratification to buckled beds of partially disarticulated bedding to fully developed flat-pebble conglomerate. These features resulted from failure of a shoreface and subsequent brittle and ductile deformation of compacted to early cemented deposits. Failure was induced by either storm or seismic waves, and many beds failed along discrete slide scar surfaces. Centimetre-scale laminae within thick amalgamated HCS beds were planes of weakness that led to the development of platy clasts within partly disarticulated and rotated bedding of the buckled beds. In some cases, buckled masses accelerated downslope until they exceeded their internal friction, completely disarticulated into clasts and transformed into a mass flow of individual cm-to dm-scale clasts. This transition was accompanied by the addition of sand-sized echinoderm-rich debris from local sources, which slightly lowered friction by reducing clastclast interactions. The resulting dominantly horizontal clast orientations suggest transport by dense, viscous flow dominated by laminar shear. These flows generally came to rest on the lower shoreface, although in some cases they continued a limited distance beyond fairweather wave base and were interbedded with shale and grainstone beds. The clasts in these beds show no evidence of extensive reworking (i.e. not well rounded) or condensation (i.e. no rinds or coatings). A second type of flat-pebble conglomerate bed occurs at the top of upward-coarsening, metre-scale cycles. The flat-pebble conglomerate beds cap these shoaling cycles and represent either lowstand deposits or, in some cases, may represent transgressive lags. The clasts are well rounded, display borings and have iron-rich coatings. The matrix to these beds locally includes glauconite. These beds were considerably reworked and represent condensed deposits. Thrombolites occur above the flat-pebble beds and record microbial growth before initial transgression at the cycle boundaries. A third (2004) 51, 973-996 Ó 2004 International Association of Sedimentologists 973 type of flat-pebble conglomerate bed occurs within unusual metre-scale, shaledominated, asymmetric, subaqueous cycles in Shoshone Canyon, Wyoming. Flat-pebble beds in these cycles consist solely of clasts of carbonate nodules identical to those that are in situ within underlying shale beds....

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“…The name Boysen Lirnestone has been used by some stratigraphers (Deiss, 1938(Deiss, , p. 1104vVanless, Belknap, and Foster, 1955, p. 13-14) in parts of western Wyoming to replace the older term Gallatin because an adequate type section for the Gallatin had not been designated. The writers feel, however, that this reason is not sufficient for changing a name tha:t has both precedence -and wide usage in western Wyoming and adjacent parts of Idaho.…”

Section: Thicknessmentioning

confidence: 99%

Geology of the Garns Mountain quadrangle, Bonneville, Madison, and Teton Counties, Idaho

Staatz¹,

Albee²

1966

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Cambrian formations and sections in part of Cordilleran trough

Cited by 27 publications

References 0 publications

Geology of the Du Noir area, Fremont County, Wyoming

Geology of the Du Noir area, Fremont County, Wyoming

Flat‐pebble conglomerate: its multiple origins and relationship to metre‐scale depositional cycles

Geology of the Garns Mountain quadrangle, Bonneville, Madison, and Teton Counties, Idaho

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