Abstract

Recent exposures at Pools Farm Pit, Brandon have allowed a reinvestigation of strat-igraphic relationships critical to the debate concerning the status of the Wolstonian Stage of the British Pleistocene. Central to the original case for maintaining the type site of the Wolstonian Stage at Wolston, Warwickshire is the acceptance that the fluviatile Baginton Formation (Shotton’s Baginton-Lillington Gravel and Baginton Sand) forms, together with the glacigenic Wolston Formation, a series of sediments (Shotton’s Wolston Series) deposited during a single post-Hoxnian (i.e. post-oxygen isotope stage 9) glacial stage. Evidence presented in this paper suggests this interpretation is no longer tenable.

The sediments of the Baginton Formation exposed at Pools Farm Pit record the facies changes identified by Shotton in 1968. A predominantly gravel unit, the Brandon Gravels (Baginton Gravel Member), is overlain by a sandy unit, the Brandon Sands (Baginton Sand Member), the bounding surface being erosional. Two newly exposed fine-grained organic channel fills are described. The Brandon Lower Organic Sands and Silts lie within the Brandon Gravels and contain a temperate coleopteran fauna and a boreal forest flora. Correlation of these organic deposits on fauna1 grounds with the nearby site of Waverley Wood suggests a correlation with oxygen isotope stage 15. The Upper Organic Silts and Clays lie within the Brandon Sands and contain a cold climate fauna and flora. The Brandon Sands are overlain locally by the Brandon Upper Sands and Gravels which are correlated with the Ailstone Member of the Avon Valley Formation (stage 6). The younger Avon Valley Formation is known to extend back to at least stage 9 and therefore given that the Wolston Formation is younger than the Baginton Formation as indicated by a borehole nearby, it could represent any of the cold stages 10, 12 or 14. However, stage 12, the Anglian, remains the most likely attribution.

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