Appendix on the petrography of the Devonian sedimentary rocks

Shannon, W.G.

doi:10.1016/s0016-7878(28)80021-6

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“…This absence has also been observed by Shannon in the Hangman Grits of Exmoor (10). Now, according to Heard and Davies, who made a petrological examination of the Old Red Sandstone of the Cardiff Area (5), garnet is common there throughout the series, and chlorite is abundant except in the upper group.…”

Section: Comparison Of the Triscombe Beds Axd The Hodder's Combe mentioning

confidence: 70%

The Geology of the Hangman Grits of the Quantock Hills

Hallam¹

1934

Geol. Mag.

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The Hangman Grits of the Quantocks consist of a series of sand-stones, now, in most instances, practically converted into quartzites by the great pressure to which they were subjected during the Armorican movements, and occasional shales, which sometimes show cleavage. There are also beds, never of any great thickness, which bear a strong resemblance to the Keuper Marls. Fossils, other than a few obscure plant-remains, are unknown, except in the beds which are usually regarded as forming the top of the series, where marine fossils occur as casts in what is evidently a decalcified calcareous sandstone.

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Section: Comparison Of the Triscombe Beds Axd The Hodder's Combe mentioning

confidence: 70%

The Geology of the Hangman Grits of the Quantock Hills

Hallam¹

1934

Geol. Mag.

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Sediment distribution and Quaternary history

Hails¹

1975

JGS

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The superficial sediments in Start Bay consist of three discrete lithological units, know as barrier, bay and bank deposits. Flint and quartz are the dominant constituents of the barrier deposits with small quantities of rhyolite, felsite and grantie. The bay deposits are mainly fine-grained sediments varying in thickness from about 1 m in the nearshore zone, as a result of winnowing by tidal currents and waves, to a maximum of 28 m in the middle of the Bay. The bank deposits consist of coarse shelly sand, are up to 18 m thick and are located within the general vicinity of the Skerries Bank. Sedimentological and foraminiferal studies, together with C– 14 dates, show that barrier-estuarine-lagoonal environments existed seaward of the modern shoreline in the past and that barriers migrated landward in response to oscillations of sea level during the later stages of the Flandrian transgression. Available evidence indicates that Start Bay is a closed system under present-day conditions. The influence of the Skerries Bank on wave refraction and energy dissipation along the coast has been assessed. The Hallsands disaster can be attributed to the legacy of dredging shingle from the inter-tidal zone, combined with a critical combination of storm waves, gales and spring tides.

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Appendix on the petrography of the Devonian sedimentary rocks

Cited by 2 publications

References 0 publications

The Geology of the Hangman Grits of the Quantock Hills

The Geology of the Hangman Grits of the Quantock Hills

Sediment distribution and Quaternary history

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