The Lower Cambrian Wrekin Quartzite and the age of its unconformity on the Ercall Granophyre

Acritarchs of Lower Cambrian age have been recovered from a clay horizon within conglomerates 6 m above the unconformity described by Cope & Gibbons (1987). The Wrekin Quartzite (34 m thick) represents beach deposits grading upwards into shelf sandstones. The stratigraphie evidence and recent ag...

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Bibliographic Details
Published in:Geological magazine 1993-03, Vol.130 (2), p.257-264
Main Authors: Wright, A. E., Fairchild, I. J., Moseley, F., Downie, C.
Format: Article
Language:English
Subjects:
Cambrian
Conglomerates
Earth sciences
Earth, ocean, space
Exact sciences and technology
Flowers & plants
Fossils
Geology
Sedimentology
Stratigraphy
Unconformity
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Summary:Acritarchs of Lower Cambrian age have been recovered from a clay horizon within conglomerates 6 m above the unconformity described by Cope & Gibbons (1987). The Wrekin Quartzite (34 m thick) represents beach deposits grading upwards into shelf sandstones. The stratigraphie evidence and recent age determinations suggest that although the granophyre was intruded at 560 ± 1 Ma the Cambrian Unconformity is younger than 533 ± 13 Ma.
ISSN:0016-7568
1469-5081
DOI:10.1017/S0016756800009900