Barton Clay is the name given to a series of beds which form the upper division of the Eocene of the Hampshire basin. These beds are well exposed in the cliffs of Hordwell, Barton, and in the Isle of Wight. They are believed to be the equivalents in age of the Upper Bagshot Sands of the London basin.
Barton Clay
Chambers's Encyclopaedia, Volume 1: A to Beaufort, p. 767
Source scan(s): p. 0794