Exposed Units: Clent Formation (Haffield Breccia)
This is the type section for the Clent Formation, known locally as the Haffield Breccia Formation, at the base of the Permo-Triassic succession. The breccia forms a marked unconformity on Silurian and Malvern Complex rocks and forms a pronounced ridge between The Vineyard and the Glynch Brook Valley.
At this site, the Formation comprises poorly sorted, hematite-coated, subangular clasts of Malverns Complex rocks (mainly sheared, pinkish brown granite and dark green diorite) and greenish grey and purple-brown May Hill Sandstone and siltstone set in a matrix of purple to dark red brown, sandy siltstone and mudstone. The clasts are mostly less than 10cm across, but blocks up to 1m in diameter have been recorded. The sediments are generally well bedded, some beds having erosive bases scouring down as much as 30cm into the underlying sediments. In some of the southernmost exposures, the beds are less than 8 cm thick, many consisting of a thin basal breccia fining upwards into coarse-grained sandstone with only a few small clasts.
No flora or fauna has been recorded from the Haffield Breccia, but by comparison with the Clent Formation elsewhere in the West Midlands, a tentative age of Lower Permian is suggested.
WORSSAM, BC, ELLISON, RA and MOORLOCK, BSP. 1989. ‘Geology of the country around Tewkesbury’. Memoir of the British Geological Survey GB, Sheet 216, 57pp.
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