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The Petrology of the Avonian Rocks at Sodbury, Gloucestershire2

Published online by Cambridge University Press:  01 May 2009

A. W. Coysh
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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

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Footnotes

2

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

References

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