Pollen analyses of the cromer forest bed series in east anglia with an appendix on the non-marine mollusca

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Abstract
The deposits which have been analyzed lie on the coast between West Runton and Corton. No single pollen diagram shows the complete vegetational history of the period during which the Cromer Forest Bed Series was laid down, but, when considered together, the diagrams show evidence of a sequence which has been divided tentatively into 3 zones. The 1st (zone a) shows a predominance of Betula and Pinus Alnus is strongly represented throughout zone b, which shows the rise and subsequent decline of mixed oak forest trees and a similar but later change in Picea. The mixed-oak forest trees disappear in zone c, Alnus and Picea decrease and probably disappear and Betula and Pinus retun to dominance.

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