The Erratic Rocks and the Age of the Southern Limit of Glaciation in the Oxford District

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Abstract
I. I ntroduction . In this paper I propose to study the material of which the Plateau Drift consists in the Oxford District, and to discuss the inferences arising therefrom. For the sake of brevity, and to avoid restating a host of facts already published, it will be assumed that the reader has access to the latest Memoir of the Geological Survey which deals with the district, wherein he will find a detailed account and a full bibliography. In that Memoir certain problems of the erratic material which abounds in the local superficial deposits had to be left sub judice . Research was in progress, aided by the grant from the Daniel-Pidgeon Fund awarded to me in 1924, and I now present the results of the work, expressing gratitude to the Council of the Geological Society for the assistance thus afforded. I have collected material from the Plateau Drift over a wide area for rather more than eight years, and Prof. W. J. Sollas put at my disposal his important collection, mainly derived from two localities close to Oxford:—Pickett's Heath (on Boars Hill) and Chawley Brickworks, on the flank of Cumnor Hill (Cumnor Hurst). The considerable mass of material thus available has been reduced to about fifty rocks of essential importance from a petrological point of view, that is, to rocks of character so marked that they can be recognized without fear of grave error. In the work of recognition, after initial research on my own account, I submitted the material to Mr.

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