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Petrography of the Mesozoic Succession of South Wales

Published online by Cambridge University Press:  01 May 2009

C. B. Crampton
C. B. Crampton
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts.
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Abstract

The heavy mineral suites of the Trias, Rhaetic and lowermost zones of the Lower Lias in the Vale of Glamorgan of South Wales are described. The northerly coastline of the Mesozoic sea, roughly coincident with the present-day periphery of the Coalfield, consisted mainly of Carboniferous Limestone and in places, the Old Red Sandstone and Millstone Grit. The mineral assemblage at any particular point in the littoral zone was determined largely by the nature of the outcropping rocks of the coastal mainland, the derivation of detritus being very localized. Within this zone some degree of gravity sorting of the detritals occurred, this implying a relatively steeply inclined coastal sea-bed. An off-shore current carried detritus from the Armorican land-mass of Britanny and granite of South-West England to this area where the detritals were dispersed thinly throughout the locally derived sediment.

Type
Articles
Information
Geological Magazine , Volume 97 , Issue 3 , June 1960 , pp. 215 - 228
Copyright
Copyright © Cambridge University Press 1960

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References

REFERENCES

Boswell, P. G. H., 1924. The Petrology of the Sands of the Upper Lias and Lower Inferior Oolite in the West of England. Geol. Mag., lxi, 246–264.CrossRefGoogle Scholar
Brammall, A., 1928. Dartmoor Detritals: a Study in Provenance. Proc. Geol. Assoc., xxxix, 27–48.CrossRefGoogle Scholar
Crampton, C. B., 1960. Analysis of Heavy Minerals in the Carboniferous Limestone, Millstone Grit and soils derived from certain Glacial Gravels of Glamorgan and Monmouth. Trans. CardiffNat. Soc., (in press).Google Scholar
Griffiths, J. C., 1939. The Mineralogy of the Glacial Deposits of the Region between the Rivers Neath and Towy, South Wales. Proc. Geol. Assoc., 1, 433–462.CrossRefGoogle Scholar
Heard, A., 1922. The Petrology of the Pennant Series, East of the River Taff. Geol. Mag., lix, 83–92.CrossRefGoogle Scholar
Heard, A., and Davies, R., 1924. The Old Red Sandstone of the Cardiff District. Quart. Journ. Geol. Soc., lxxx, 489–519.CrossRefGoogle Scholar
Miskin, F. F., 1919. The Triassic rocks of South Glamorgan. Trans. CardiffNat. Soc., 17–25.Google Scholar
Ollier, C. D., 1954. The Triassic Sandstones of the Bristol Region. Proc. Bristol Nat. Soc., xxix, 57–70.Google Scholar
Pringle, J. and George, T. N., 1948. The Geology of South Wales. Mem. Geol. Survey.Google Scholar
Richardson, L., 1905. The Rhaetic and Contiguous Deposits of Glamorganshire. Quart. Journ. Geol. Soc., lxi, 385–424.CrossRefGoogle Scholar
Simpson, B., 1932. Note on the Petrology of the Drybrook Sandstone of the Forest of Dean. Geol. Mag., lxix, 421–425.CrossRefGoogle Scholar
Thomas, A. N., 1940. The Triassic Rocks of North–West Somerset. Proc. Geol. Assoc., li, 1–43.CrossRefGoogle Scholar
Thomas, H. H., 1902. The Mineralogical Constitution of the Finer Material of the Bunter Pebble Bed in the West of England. Quart. Journ. Geol. Soc., lviii, 620–632.CrossRefGoogle Scholar
Trueman, A. E., 1920. The Liassic Rocks of the Cardiff District. Proc. Geol. Assoc., xxxi, 93–107.CrossRefGoogle Scholar
Trueman, A. E., 1922. The Liassic Rocks of Glamorgan. Proc. Geol. Assoc., xxxiii, 245–284.CrossRefGoogle Scholar
Trueman, A. E., 1930. The Lower Lias (Bucklandi Zone) of Nash Point, Glamorgan. Proc. Geol. Assoc., xli, 148–159.CrossRefGoogle Scholar
Woodward, H. B., 1888. Notes on the Rhaetic Beds and Lias of Glamorganshire. Proc. Geol. Assoc., x, 529–538.CrossRefGoogle Scholar