Jurassic paleobiogeography of the conterminous United States in its continental setting

Imlay, Ralph Willard

doi:10.3133/pp1062

Cited by 141 publications

(179 citation statements)

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“…13). The extent of the seaway in Wyoming and the Dakotas is largely from Imlay (1980). However, its northern shoreline was modified in northern Wyoming in accordance with surface and subsurface studies by Pipiringos and O'Sullivan (1978) and Peterson (1957) that show the shallow marine(?)…”

Section: Paleogeographymentioning

confidence: 67%

“…However, its northern shoreline was modified in northern Wyoming in accordance with surface and subsurface studies by Pipiringos and O'Sullivan (1978) and Peterson (1957) that show the shallow marine(?) equivalent of the Entrada--the Lak Member of the Sundance Formation--farther north in Wyoming than envisioned by Imlay (1980). The Lak Member apparently was beveled out northward during formation of the J-3 erosion surface.…”

Section: Paleogeographymentioning

confidence: 98%

“…An unconformity between the Rierdon Formation and overlying Swift Formation in Montana probably records an eustatic fall in sea level and erosion over a fairly large area in the northern part of the Western Interior at about the same time as deposition of the Entrada (Imlay, 1980). The shoreline in western Montana or east-central Idaho is not located well because the rocks that would aid in this determination were either removed during a Late Jurassic erosion event or moved some considerable distance by later faulting.…”

Section: Paleogeographymentioning

confidence: 99%

“…Only the southern part of it correlates with the Entrada (Pipiringos et al, 1969;Pipiringos, in Segerstrom and Young, 1972Pipiringos and O'Sullivan, 1976 but the rest of the Canyon Springs is slightly older and equivalent to beds in the upper part of the Carmel Formation, which underlies the Entrada on the Colorado Plateau (Imlay, 1980;Pipiringos and O'Sullivan, 1978).…”

Section: Middle Jurassic Timementioning

confidence: 99%

“…Hence, the shoreline may have been considerably farther north and perhaps in Canada. If so, however, the Belt Island trend most likely would have been emergent as it had been an active positive structural dement during much of Jurassic time (Peterson, 1957;Imlay, 1980;Michaud, 1987). The shoreline configuration in southern Wyoming and northern Colorado was determined from stratigraphic relationships shown by Pipiringos (1968), Pipiringos et al (1969), Pipiringos (in Segerstrom andYoung, 1972), andPipifi_ngos andO'Sullivan (1978).…”

Section: Paleogeographymentioning

confidence: 99%

See 4 more Smart Citations

Pennsylvanian to Jurassic eolian transportation systems in the western United States

Peterson

1988

Sedimentary Geology

149

122

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Section: Paleogeographymentioning

confidence: 67%

Section: Paleogeographymentioning

confidence: 98%

Section: Paleogeographymentioning

confidence: 99%

Section: Middle Jurassic Timementioning

confidence: 99%

Section: Paleogeographymentioning

confidence: 99%

See 3 more Smart Citations

Pennsylvanian to Jurassic eolian transportation systems in the western United States

Peterson

1988

Sedimentary Geology

149

122

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Unconformity generation and the shift from storm‐dominated to tide‐dominated processes in a Jurassic retroarc foreland basin: Insights from ichnology

Wroblewski

Morris

2023

The Depositional Record

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An enigmatic transition from the storm‐dominated, offshore to lower shoreface deposits of the Redwater Shale Member (Sundance Formation) to the overlying mixed tidal and aeolian Windy Hill Sandstone (Morrison Formation) in the Oxfordian of the North American Western Interior has long been a source of intrigue. Previously proposed drivers include the progradation of a large, tide‐dominated delta onto a storm‐dominated shelf, a complete reorganisation of the basin's hydrodynamics and climate, or the development of a regional unconformity (termed the J‐5). In south‐eastern Wyoming, the Redwater Shale is characterised as an offshore to distal shoreface deposit with glauconitic siltstones and sandstones punctuated by coquinoid and sandy tempestites and hosting a Cruziana Ichnofacies. The Windy Hill Sandstone, a time‐transgressive, sand‐rich, intertidal succession with classic Pteraichnus and stressed Skolithos Ichnofacies, sharply overlies the Redwater Shale and records an abrupt basinward shift in facies that accompanied at least tens of metres of sea‐level fall. New, detailed sedimentological, ichnological and architectural data collected across this transition in the study area provide fresh insights into the depositional history of these units and demonstrates the existence locally of a composite J‐5 unconformity. The unconformity developed as tectonically driven, prograding shoreline trajectories of the Redwater Shale gave way to degrading trajectories of the Windy Hill Sandstone, leading to a forced regression and formation of a regressive surface of marine erosion. The sharp juxtaposition of intertidal flat facies (Pteraichnus Ichnofacies) directly upon offshore to lower shoreface deposits (Cruziana Ichnofacies) is the key to recognising the unconformity and proves the value of the previously underutilised ichnological data.

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The sedimentological expression of transgression–regression cycles upon aeolian–marine margins

Cross

Pettigrew

Priddy

et al. 2023

The Depositional Record

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When compared to their temperate coastal counterparts, sediments deposited and preserved along arid aeolian to shallow‐marine margins remain relatively poorly understood, particularly at the scale of lithofacies units and architectural elements. These systems often record evidence for relative sea‐level change within sedimentary basins. This work focusses on the Entrada–Curtis–Summerville formations that crop out in central eastern Utah, USA, and provides a detailed analysis of the aeolian Moab Member of the Curtis Formation (informally known as the Moab Tongue) that was impacted by cycles of marine transgressions and regression in the late Jurassic. This study utilises photogrammetry, sedimentary logging and sequence‐stratigraphical analysis techniques. Results indicate that four short‐lived transgressive‐regressive cycles are preserved within the Moab Member, followed by a broad regressive event recorded at the transition between the Curtis and Summerville formations. These cycles relate to changes in the relative sea level of the Sundance Sea and the deflation and expansion of the neighbouring aeolian dune field. During periods of normal regression, marine sediments displayed evidence of tidal and wave action, whereas the continental domain was characterised by growth of the aeolian system. However, when regression occurred within optimal physiographic conditions such as a restricted, semi‐enclosed basin, and at sufficient magnitude to outpace erg expansion, this acted to shut‐down bedform development and preservation. A rapid restriction of aeolian sediment availability and the inability of the dune field to recover resulted in the formation of deflationary sandsheets, arid coastal plain strata and contemporaneous shallow‐marine deposits that are starved of wind‐sourced sediments. This study highlights how a rapidly developing high‐magnitude regression can lead to the overall retraction of the erg. Deciphering the evolution and sequence stratigraphical relationships of arid aeolian to shallow marine margins is important in both understanding environmental interactions and improving the characterisation of reservoir rocks deposited in these settings.

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Jurassic paleobiogeography of the conterminous United States in its continental setting

Cited by 141 publications

References 0 publications

Pennsylvanian to Jurassic eolian transportation systems in the western United States

Pennsylvanian to Jurassic eolian transportation systems in the western United States

Unconformity generation and the shift from storm‐dominated to tide‐dominated processes in a Jurassic retroarc foreland basin: Insights from ichnology

The sedimentological expression of transgression–regression cycles upon aeolian–marine margins

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