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The Presence of the Namurian in the Bristol District

Published online by Cambridge University Press:  01 May 2009

L. R. Moore
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Extract

The occurrence of massive reddish sandstones and quartzites lying between the Coal Measures and Carboniferous Limestone in the Bristol District has long been known. From their position and distinctive lithology, these beds have been referred to as the Millstone Grit by many early writers, amongst whom Austin (1865) may be mentioned. However, it has been shown that in part these beds are of Lower Carboniferous age. This was recognized by Vaughan (1905) notably in the Avon Section and at Long Ashton, where red grits and sandstones, previously regarded as Millstone Grit, were shown to represent horizon ∈, and later found by him to be of D3 age. Dr. Stanley Smith (1930) has shown at Wick, on the eastern border of the Bristol Coalfield, that the lower part of the red and gritty beds of that area are likewise of Avonian D3 age. Dr. Smith suggested a non-sequence between Lower and Upper Carboniferous to occur some 30 feet above a thin gritty limestone, the “Mollusca Band” of D3 age. Between this horizon and that from which Yorkian plants were recorded (Crookall in Smith, 1930, p. 342), some 350 to 400 feet of grits and micaceous shales occurred. These beds were of uncertain age, and Dr. Smith held the opinion that part and probably most of these beds belong to the Upper Carboniferous.

Type
Articles
Information
Geological Magazine , Volume 78 , Issue 4 , August 1941 , pp. 279 - 292
Copyright
Copyright © Cambridge University Press 1941

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References

REFERENCES

Austin, T., 1865. The Millstone Grit, its Fossils and the relation it bears to other Groups of Rocks, etc. 8vo. London and Bristol.Google Scholar
Bailey, E. B., 1926. Plant Migrations across the Millstone Grit. Geol. Mag., lxiii, 49.CrossRefGoogle Scholar
Bolton, H., 1907. On a Marine Fauna in the Basement Beds of the Bristol Coalfield. Quart. Journ. Geol. Soc., lxiii, 445.CrossRefGoogle Scholar
Crookall, R., 1939. The “Plant Break” in the Carboniferous Rocks of Great Britain. Bull. Geol. Surv., Gt. Britain, No. 1, 13.Google Scholar
Crookall, R., and Welch, F.B.A., 1935. British Regional Geology: Bristol and Gloucester District.Google Scholar
Dix, E., 1933. The Succession of Fossil Plants in the Millstone Grit and the Lower Portion of the Coal Measures of the South Wales Coalfield (near Swansea), and a Comparison with that of other areas. Palaeontographica, Ixxviii, 158.Google Scholar
Dix, E., 1935. The Succession of Fossil Plants in the South Wales Coalfield with special reference to the existence of the Stephanian. Congrés Stratig. Carb. Heerlen, i, 159.Google Scholar
Fedotov, D. M., 1932. The Carboniferous Pelecypods of the Donetz Basin. Trans. United Geol. Prospecting Services U.S.S.R., Fasc. 103, 202.Google Scholar
Hind, W., 1896–1905. Monograph of the British Carboniferous Lamellibranchiata. Palaeont. Soc., London, vols, 1, 2.Google Scholar
Hind, W., 1908. On the Lamellibranch and Gasteropod fauna found in the Millstone Grit of Scotland. Trans. Roy. Soc. Edinb., xlvi, pt. ii (No. 15), 331.Google Scholar
Kidston, R., 1916. Contributions to our Knowledge of British Palaeozoic Plants. Pt. I: Fossil Plants from the Scottish Coal Measures. Trans. Roy. Soc. Edinb., Ii, pt. iii (No. 22), 709.Google Scholar
Kidston, R., 1923–1924. Fossil Plants of the Carboniferous Rocks of Great Britain. Mem. Geol. Surv., Palaeontology.Google Scholar
Macgregor, M., 1928–1929. Scottish Carboniferous Stratigraphy. An introduction to the study of the Carboniferous Rocks of Scotland. Trans. Geol. Soc. Glasgow, xviii, pt. iii, 442.Google Scholar
Macgregor, M., and Pringle, J., 1934. The Scottish Millstone Grit and its position in the Zonal Succession. Sum. Prog. Geol. Surv. for 1933, pt. ii, 1.Google Scholar
Meek, F. B., 1872. The Final Report of the U.S. Geol. Surv. of Nebraska, p. 195, pl. iv, figs, ii a-c.Google Scholar
Moore, L. R., and Trueman, A. E., 1937. The Coal Measures of Bristol and Somerset. Quart. Journ. Geol. Soc., xciii, 218.Google Scholar
Moore, L. R., 1939. The Structure of the Bristol and Somerset Coalfields. Proc. Geol. Assoc., 1, pt. i, 57.Google Scholar
Newell, N. D., 1937. Late Palaeozoic Pelecypods: Pectinacea. State Geol. Survey Kansas. (Univ. Kansas), x, 39., pl. 2, figs. 12–18.Google Scholar
Patteisky, K., 1935. Das Verhältnis der Zonen von Diplotmema adiantoides und der Lyginopteris Arten zu den Goniatiten-Zonen des Ostsüdetischen Karbons. Congrès Stratig. Carb. Heerlen, ii, 715, pls. 82–4.Google Scholar
Reynolds, S. H., 1930. The Geology of the Bristol District with some account of the Physiography. Handbook, Brit. Assoc. Meeting (Bristol).Google Scholar
Smith, S., 1930. The Carboniferous Inliers at Codrington and Wick (Gloucestershire). Quart. Journ. Geol. Soc., lxxxvi, pt. 3, 331.CrossRefGoogle Scholar
Stubblefield, C. J., 1932. Contributions to the Geology of the Kent Coalfield. Sum. Prog. Geol. Surv. for 1331, pt. ii, 71.Google Scholar
Vaughan, A., 1905. The Palaeontological Sequence in the Carboniferous Limestone of the Bristol Area. Quart. Journ. Geol. Soc., lxi, 181.CrossRefGoogle Scholar
Walton, J., 1931. On the Fossil flora of the Black Limestones in Teila Quarry, Gwaenysgor, near Prestatyn, Flintshire. Phil. Trans. Roy. Soc., B, 219., 347.Google Scholar
Ware, W. D., 1939. The Millstone Grit of Carmarthenshire. Proc. Geol. Assoc., 1, pt. 2, 168.CrossRefGoogle Scholar
Weir, J., and Leitch, D., 1936. The Zonal Distribution of the Non-marine Lamellibranchs in the Coal Measures of Scotland. Trans. Roy. Soc Edinb., lviii, pt. iii (No. 25), 697.Google Scholar
Welch, F. B. A., 1931. The Avonian Inlier at Upper Vobster. Geol. Mag., lxviii, 421.CrossRefGoogle Scholar
Welch, F. B. A., 1932. On the Occurrence of the D3 Sub-zone in the Mendip Area. Proc. Bristol Nat. Soc., ser. iv, vii, 303.Google Scholar
Welch, F. B. A., 1933 The Geological Structure of the Eastern Mendips. Quart. Journ. Geol. Soc., lxxxix, 14.CrossRefGoogle Scholar