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On the Late Precambrian–Early Cambrian Hartshill Formation of Warwickshire

Published online by Cambridge University Press:  01 May 2009

M. D. Brasier ,
R. A. Hewitt  and
C. J. Brasier
M. D. Brasier
Affiliation:
Geology Department, The University, Hull
R. A. Hewitt
Affiliation:
Department of Geological Sciences, The University, Birmingham
C. J. Brasier
Affiliation:
Geology Department, The University, Hull
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Summary

The Hartshill Formation (c. 270 m) consists largely of shallow-water feldspathic sandstones and greywackes lying unconformably on Precambrian (Vendian?) volcanic rocks and below shales with the first olenellid trilobites. Five members are recognized. The Park Hill Member is conglomeratic and arkosic near the base, passing up into green-grey megarippled quartzites with some thick shale bands. The Tuttle Hill Member is more shaly and glauconitic with conspicuous bioturbation. The Jee's Member is of distinctly cross-laminated glauconitic, feldspathic greywackes and shales with numerous trace fossils. Conglomerates, shales, sandstones, phosphorites and limestones comprise the Home Farm Member, withadiverse Tommotiantype shelly fauna and stromatolites near the top. Massive arkoses and greywackes of the Woodlands Member yield similar shelly fossils in calcareous beds at the base and top while the overlying Purley Shale yields the first Lower Cambrian trilobites.

Type
Articles
Information
Geological Magazine , Volume 115 , Issue 1 , January 1978 , pp. 21 - 36
Copyright
Copyright © Cambridge University Press 1978

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