Sedimentary Facies Analysis (IAS Special Publication, No. by A. Guy Plint

By A. Guy Plint

This e-book celebrates the pro profession of Harold analyzing, who has performed a number one function within the improvement of the IAS, and has been on the roots of the advance of 'facies sedimentology' as an artwork in itself and as a huge instrument within the broader box of geology. This unique choice of unique learn papers from Harold Reading's scholars covers the wide variety of his examine pursuits and displays the ability of facies sedimentology at the present time. cutting-edge examine papers within the vital box of facies sedimentology * a festschrift to at least one of the nice names in sedimentology.

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Extra resources for Sedimentary Facies Analysis (IAS Special Publication, No. 22)

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G. Lamplugh, 1 922; Wright & W right, 19 47; Casey, 19 61 ; Owen, 1 9 72). These data have been incor­ porated into Table 1 and Figs 3 & 4. SEDIMENTOLOGICAL CHARACTERISTICS This section outlines in detail the sedimentological cha racteristics of the six main facies types. The key points of description and interp retation are summarized in Table l . Transgressive estuarine sand complex A 25 B BOREAL BOREAL SEA SEA :r: ,' � Main palaeocurrent directions 50 100km �--- 5. Three schematic palaeogeographical maps illustrating the transgressive history of the Lower Cretaceous in the southern North Sea- English Channel area, and the evolution of the 'Bedfordshire Strait' which ultimately connected the Boreal Sea and the Wealden Basin.

Levell 42 the infilling 0f deep ebb-dominated channels and interbar troughs. 4 Possibly an overall seaward i ncrease in the size of cross-bedding in response to deeper-water conditions. 5 Higher quality and more homogeneous reservoir characteristics compared with the inner estuarine sands as a result of both stronger tidal currents and increased wave activity. Shale layers are likely to be very thin and discontinuous, or absent. The vertical sequence through this type of trans­ gressive sand complex would tend to have lower reservoir quality sands in the lower part and higher reservoir quality sands towards the top (Fig.

D) Isolated example of a vertical, clay-lined burrow resembling Ophiomorpha. Background facies is ripple laminated, ftaser bedded sand. suggested by the small scale of cross-bedding and the predominance of r ipple cross-lamination , whereas the extensive clay drapes suggest relatively long periods of quiet water conditions. Silver Sands Description The Silver Sands consist of well-sorted , medium- to very coarse-grained quartz arenites (previously used as glass sands ) . Sooty and woody carbonaceous matter is locally abundant, but clay drapes are absent.

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