Cambrian Off-Shelf Sedimentation, Central Appalachians

Reinhardt, Juergen

doi:10.2110/pec.77.25.0083

Cited by 23 publications

(23 citation statements)

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“…Because it is poorly exposed, precise details of the subfacies and their vertical and lateral organization are not as clear as they are in the Conococheague. Reinhardt (1974Reinhardt ( , 1977 was able, however, to establish a composite stratigraphic column for the Frederick Limestone showing the general vertical distribution of subfacies in the Frederick (Fig. 13).…”

Section: Off-platform Facies Of the Frederick Limestonementioning

confidence: 99%

“…Elements include platform facies (cf. Reinhardt & Hardie, 1976;James & Kobluk, 1978;Markello, Tillman & Read, 1979;Demicco & Mitchell, 1982;Pratt & James, 1982); intrashelf basin fills (Markello & Read, 1981, 1982 and off-platform basins to the east (Reinhardt, 1974(Reinhardt, , 1977James, 1981;Read & Pfeil, 1983). Shelf margin facies between the platform and basinal facies are rarely seen (Markello & Read, 1982;Read t Pfeil, 1983).…”

Section: Introductionmentioning

confidence: 99%

“…In western Maryland, Upper Cambrian carbonates accumulated on a shallow platform to the west (Conococheague Limestone, Demicco & Mitchell, 1982) and in a relatively shallow basin to the east (Frederick Limestone, Reinhardt, 1974Reinhardt, , 1977. The off-platform Frederick Limestone contains massive 2 R. V. Demicco Valley (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Platform and off‐platform carbonates of the Upper Cambrian of western Maryland, U.S.A.

Demicco

1985

Sedimentology

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Upper Cambrian carbonates in western Maryland are comprised of platform facies (Conococheague Limestone) west of South Mountain and basin facies (Frederick Limestone) east of South Mountain. Conocheague platform carbonates contain interbedded non‐cyclic and cyclic facies. Non‐cyclic facies consist of cross‐stratified grainstones, thrombolitic bioherms, and graded, thin‐bedded dolostones. These were deposited in shallow, subtidal shelf lagoons. Cyclic facies are composed of repeated sequences of cross‐stratified grainstone; ribbon‐rock; wavy, prism‐cracked laminite; and planar laminated dolostone. The cyclic facies are shallowing‐upward cycles produced by lateral progradation of tidal flats over shallow, nearshore subtidal environments. Cyclic and non‐cyclic facies are interbedded in the Conococheague in a layer cake fashion, but no higher‐order cyclicity can be found. The Frederick Limestone is dominated by monotonously thick sequences of graded, thin‐bedded limestones, interbedded with massive peloidal grainstones and beds of breccia up to 10 m thick in the lower Frederick. The breccias contain transported megaclasts of Epiphyton‐Girvanella boundstones. The basal Frederick was deposited in a slope‐to‐basinal setting east of a rimmed shelf. An Epiphyton‐Girvanella marginal reef along the shelf edge was the source of the blocks in the breccias. The upper Frederick Limestone formed on a carbonate ramp.

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Section: Off-platform Facies Of the Frederick Limestonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Platform and off‐platform carbonates of the Upper Cambrian of western Maryland, U.S.A.

Demicco

1985

Sedimentology

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“…These models constitute an alternative to the siliciclastic submarine fan model. The siliciclastic model has been poorly applied to ancient carbonate systems (Reinhardt, 1977;Ferry, 1976Ferry, , 1979Bosellini et al, 1981;Ruiz-Ortiz, 1983;Wright and Wilson, 1984;Watts, 1987Watts, , 1990Hazlett and Warme, 1988;Leary and Feeley, 1991;Braga et al, 2001) and modern carbonate fans have never been observed.…”

Section: Introductionmentioning

confidence: 99%

Geometry and petrophysical parameters of a calcarenitic turbidite lobe (Barremian-Aptian, Pas-de-la-Cluse, France)

Savary

Ferry

2004

Sedimentary Geology

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“…Furthermore, a number of studies on modern carbonate systems have shown that platform-derived aragonitic muds can become an important component of sediments deposited in deepwater basins adjacent to shallow-water platform areas (Kier & Pilkey, 1971;Mullins & Neumann, 1979;Schlager & Chermak, 1979;Crevello & Schlager, 1980;Droxler & Schlager, 1985). Work on other ancient analogues is rather more sparse, but includes Evans & Kendall(1977), Smith (1977) and Reinhardt (1977).…”

Section: (C) Allochthonous Supply From Platform Areasmentioning

confidence: 99%

Cyclic sedimentation in the Southern Alpine Rhaetic: the importance of climate and eustasy in controlling platform‐basin interactions

1990

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Uppermost Triassic (Rhaetic) facies, as developed in the Southern Alpine region of Northern Italy, were deposited in a rapidly subsiding, fault‐dissected trough (the Lombardy Basin) bounded by carbonate platforms. The main part of the Rhaetic succession consists of 10‐m‐scale asymmetric cycles, each divided into three parts: a lower shale portion; a central rhythmic portion consisting of repeated marl‐limestone couplets, the limestone parts of which thicken upward; and an upper, wholly carbonate unit. A study of the diagenetic history of the series demonstrates that both the major asymmetric cyclicity and the limestone‐marl couplets of the central rhythmic member (together constituting a ‘compound’ cyclic form) are fundamentally depositional in nature. It is suggested that this compound cyclicity resulted from the superposition of a low‐frequency (approximately 100 000‐year periodicity) asymmetric carbonate mud signal with a higher‐frequency terrigenous mud signal. Field, petrographic, and geochemical investigations suggest that the basinal carbonate is predominantly allochthonous in origin, having been derived as relatively pure aragonitic mud from adjacent carbonate platforms. It is postulated that the asymmetric carbonate signal was linked to the ecological effects of eustatic fluctuation on platform carbonate systems. Repeated subaerial exposure of subtidal muds in shallow areas indicates that such sea‐level variations occurred. A model is presented in which the basinward export of carbonate was negligible in the deepening phase, increased to a maximum during shallowing and was finally halted by the emergence of large platform flats. In contrast, the higher frequency terrigenous mud signal of the basin is thought to have been climatically modulated; fluctuations of a shorter period than those predicted by the Milankovitch theory affected hinterland precipitation and runoff. Particularly rapid subsidence and high depositional rates may have allowed the preservation of this signal.

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Cambrian Off-Shelf Sedimentation, Central Appalachians

Cited by 23 publications

References 0 publications

Platform and off‐platform carbonates of the Upper Cambrian of western Maryland, U.S.A.

Platform and off‐platform carbonates of the Upper Cambrian of western Maryland, U.S.A.

Geometry and petrophysical parameters of a calcarenitic turbidite lobe (Barremian-Aptian, Pas-de-la-Cluse, France)

Cyclic sedimentation in the Southern Alpine Rhaetic: the importance of climate and eustasy in controlling platform‐basin interactions

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