Sedimentary structures in the Lower Greensand of the Weald, England, and Bas-Boulonnais, France

Narayan, J.

doi:10.1016/0037-0738(71)90012-1

Cited by 43 publications

(11 citation statements)

References 17 publications

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“…Kreisa & Moiola (1984, 1986 described sigmoidal tidal bundles in the Curtis Formation, a stratigraphic equivalent of the Sundance Formation in central Utah. Similar stratification has been described in ancient and modern sediments by Allen & Narayan (1964); Boersma (1967); Narayan (1971); Nio (1976); Visser (1980); Allen (1981a, b); Homewood & Allen (1981); Boersma & Terwindt (1981a, b); Berg(1982); Siegenthaler(l982); Nio, Siegenthaler tkYang(1983);Allen &Homewood(1984); Mowbray & Visser (1984); Teyssen (1984); and Yang & Nio (1985). A cyclic variation in the thickness of the sets of large-scale cross-stratification bounded by sigmoidal reactivation surfaces is often demonstrable in tidal bundles.…”

Section: Tidal Bundles Of the Uppermost Sundance Formationsupporting

confidence: 84%

Tidal inlet sequence, Sundance Formation (Upper Jurassic), north‐central Wyoming

1988

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The sandstones and coquinas of the upper 20 m of the Sundance Formation are interpreted as a tidal inlet, back‐barrier shoal and sandy tidal‐flat sequence deposited at the close of marine Jurassic sedimentation in north‐central Wyoming. The barrier strandline maintained a generally E‐W trend as it prograded to the north. The lateral migration of inter‐barrier tidal inlets along the regressive shoreline of the late Sundance sea caused the coquinas and sandstones of the uppermost Sundance Formation to be deposited as tabular, laterally‐extensive units. Tidal bundles, sigmoidal reactivation surfaces, herringbone cross‐lamination and abundant mud drapes within the sandstones are evidence of considerable tidal influence during the deposition of the uppermost Sundance Formation. Earlier models, which attach an offshore environment of deposition to the sequence, do not explain the tabular geometries of the sandstone and coquina units and their conformable stratigraphic relationship with the overlying non‐marine sediments of the Morrison Formation.

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Section: Tidal Bundles Of the Uppermost Sundance Formationsupporting

confidence: 84%

Tidal inlet sequence, Sundance Formation (Upper Jurassic), north‐central Wyoming

1988

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“…Some ancient shelf sediments have thus been interpreted as tidal (e.g. Klein, 1970;Narayan, 1971;Kuijpers, 1971;McCave, 1973) or storm sediments (e.g. Hantzschel & Reineck, 1968;Swift, Heron & Dill, 1969) although several authors have suggested a combination of storm conditions and tidal currents to explain certain facies (Allen & Narayan, 1964;Goldring & Bridges, 1973;Banks, 1973).…”

Section: Introductionmentioning

confidence: 99%

Tidal‐shelf sedimentation: an example from the Scottish Dalradian

Anderton

1976

Sedimentology

165

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The Jura Quartzite, a formation of probably late Precambrian metasediments over 5 km thick from the Caledonian belt in Southwest Scotland, has been divided into a coarse and three fine facies. The former comprises cross‐bedded sands with some laminated sands and silt horizons, interpreted as the deposits of shallow marine tidal dunes and other bedforms together with some beach units. Deposition from suspension of silt and sand formed climbing dunes while largescale erosion produced flat or channelled surfaces. The fine facies comprise laterally persistent, parallel and cross‐laminated sand units from millimetres to decimetres thick, interbedded with muds. The coarse and fine facies can be finely interbedded, the former sometimes filling decimetre deep, straight channels, cut in the latter. The fine facies exhibit structures indicative of deposition from decelerating currents and are interpreted as shallow marine storm deposits. The facies are compared with a model developed from published observations on modern shelf areas. Zones of erosion, large and small dunes, flat bedded sand and mud are considered to be the end product of a wide spectrum of tidal and storm conditions. During severe storms the fair weather tidal dunes may be modified or washed out, new dunes may be initiated downcurrent of the normal dune field while storm‐sand layers are deposited in the distal zones. Hence, the nature of the preserved sediment blanket reflects the rare severe storm event rather than normal tidal conditions. The Jura Quartzite was deposited in a tidal gulf intimately connected with an ocean basin. The north‐northeast directed palaeocurrent modes are probably roughly parallel to the coastline.

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“…A further problem of interpretation arises from the unimodal palaeocurrent patterns that have been recorded from several sandstone bodies that are interpreted as tidal deposits (Narayan, 1971 ;Banks, 1973a;McCave, 1973;Anderton, 1976;Nio, 1976;Spearing, 1976;Hereford, 1977;Johnson, 1977a;Brenner, 1978). In thin (less than ca 20 m) sandstones this problem can sometimes be explained by the fact that separate tidal channels normally carry ebbing and flooding water, and in the deposits of a single channel fill a unimodal transport pattern is therefore to be expected.…”

mentioning

confidence: 99%

A late Precambrian tidal shelf deposit, the Lower Sandfjord Formation, Finnmark, North Norway

Levell

1980

Sedimentology

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The Lower Sandfjord Formation is a 1.5 km thick late Precambrian sandstone. It is a remarkably homogeneous unit consisting largely (98%) of cross‐bedded, texturally and mineralogically mature, coarse or medium sandstone, and is interpreted as a shallow marine deposit. This interpretation is based on the maturity, the exclusively tabular bed geometry, occasional sets of herring‐bone cross‐bedding and most importantly, the abundance of sheet‐like pebble layers only 1–5 grain diameters thick and sometimes overlain by thin siltstone drapes. Various different types of compound cross‐bedding, all of which show evidence of reversing currents, are interpreted as sub‐tidal sandwaves. These sets range in thickness from 0.5 to 14 m, and in conjunction with the overall abundance of cross‐bedding probably indicate strong tidal currents. A tide‐dominated current regime is also considered essential to explain the derivation of such large quantities of sand from the contemporary coasts. It is suggested that sand transport offshore took place during the erosional transgression of abandoned delta lobes. However, the predominance of a single, easterly, mode in the palaeocurrent patterns suggests that the tidal currents were reinforced by some other current system. The predominantly unimodal palaeocurrent patterns and the coarse, sand‐rich nature of the succession, taken together with the thickness do not superficially seem likely characteristics for a shallow marine sequence. Nevertheless this study appears to demonstrate that such deposits were formed on tidal shelves in at least late Precambrian time.

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Sedimentary structures in the Lower Greensand of the Weald, England, and Bas-Boulonnais, France

Cited by 43 publications

References 17 publications

Tidal inlet sequence, Sundance Formation (Upper Jurassic), north‐central Wyoming

Tidal inlet sequence, Sundance Formation (Upper Jurassic), north‐central Wyoming

Tidal‐shelf sedimentation: an example from the Scottish Dalradian

A late Precambrian tidal shelf deposit, the Lower Sandfjord Formation, Finnmark, North Norway

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