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Discussion on Eocene sedimentation and tectonics in the Hampshire Basin

MR K. P. ISAACwrites: I agree with the overall thesis of Plint's (1982) paper that from late Lower Eocene times onwards sedimentation in the Hampshire Basin was controlled to a large extent by Eocene folding and faulting. Consideration of further evidence from slightly to the W of the area examined by Plint (op. cit.) demonstrates a more complex tectonic history in the Palaeogene and refutes Plint's, albeit speculative, hypothesis of a W-E trending axial supply (drainage system ?) of material from Dartmoor across E Devon to Dorset (Plint 1982, fig. 2) during the Eocene. The points raised are not intended to be criticism, as some of the evidence on which my comments are based is as yet unpublished (Isaac, paper in preparation, but see Isaac 1979, 1981).

My comments are:

(1) That stratigraphical evidence in the Bovey Basin area indicates that the most important phase of erosion and re-deposition of early Palaeogene and Cretaceous sediments occurred between the Lower Eocene(?) and the late Middle Eocene. Thereafter, Upper Eocene and Oligocene residual deposits (Bristow 1968) and Upper Palaeozoic rocks provided the bulk of the reworked material. More specifically, there were at least 2 phases of tectonic activity separated by a period of relative quiescence. The first phase was from the Lower to the late Middle Eocene and correlates with the destruction of any Cretaceous and early Palaeogene cover. The second phase was from the Upper Eocene onwards and correlates with renewed down-cutting into Upper Palaeozoic rocks and their only recently

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