Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-23T16:18:05.067Z Has data issue: false hasContentIssue false
  • English
  • Français

The Petrology of the Avonian Rocks at Sodbury, Gloucestershire2

Published online by Cambridge University Press:  01 May 2009

A. W. Coysh
Get access Rights & Permissions [Opens in a new window]

Summary and conclusions

(a) The insoluble residues from the limestones contain detrital quartz, amorphous, cryptocrystalline and microcrystalline silica, siliceous pseudomorphs after organic remains, sponge spicules, fluor, magnetite, pyrites, zircon, ilmenite, tourmaline, muscovite, biotite, and felspar.

(b) No megascopic chert occurs.

(c) The succession contains more arenaceous and argillaceous rocks than occur in the Avon section. They contain magnetite, rutile, zircon, ilmenite, tourmaline, muscovite, and staurolite among the rarer constituents

(d) Oolites have a notably small average percentage of insoluble residues, probably owing to their rapid formation, in clear water.

(e) The detrital material in the Avonian rocks of Sodbury has probably been derived, directly or indirectly, from some Pre-cambrian complex to the north or north-west.

Type
Original Articles
Information
Geological Magazine , Volume 64 , Issue 4 , April 1927 , pp. 167 - 176
Copyright
Copyright © Cambridge University Press 1927

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

2

An abstract of this paper was read before Section C of the British Association, Oxford, 1926.

References

BIBILIOGRAPHY

1898. , Woodward and , Strahan, Mem. Geol. Surv., Summary of Progress, pp. 191–2.Google Scholar
1902. , Strahan, Mem. Geol. Surv., Summary of Progress, pp. 192–4 (with horizontal section).Google Scholar
1905. , Vaughan Q.J.G.S, vol. lxi, pp. 204–11, and vertical section, pl. xxvii.Google Scholar
1923. , Reynolds Geol Mag., Vol. LX, pp. 111–19.Google Scholar
1925. , Tuck, Proc. Bristol Nat. Soc., ser. IV, vol. vi, pt. iii, pp. 237–49.Google Scholar