Preliminary Results of a Borehole at Petrockstow, North Devon

Fenning, P. J.; Freshney, E. C.

doi:10.1017/s0016756800052596

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B Determination Of Rock Densities1

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1971

1988

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Cited by 8 publications

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“…Cooke (1952) has discussed this variation for a homogeneous clay deposit, but his approach cannot be applied to a lithologically diverse deposit such as the Bovey beds. Unfortunately no borehole density logs of the" Bovey beds exist but a density log of the Petrockstow beds has been carried out (Fenning & Freshney, 1968). These beds (Freshney & Fenning, 1967) are situated to the north-west of Dartmoor and consist of lacustrine clay deposits of Oligocene age, and so it is a reasonable assumption that the density variation here will not be significantly different from that of the Bovey beds.…”

Section: B Determination Of Rock Densitiesmentioning

confidence: 99%

A gravity survey of the Bovey Tracy basin, Devon

Fasham

1971

Geol. Mag.

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A detailed gravity survey, carried out to determine the thickness of the Bovey Tracey beds, is described. After removal of the regional gradient a residual gravity anomaly of -15 mgal can be attributed to the Bovey beds. This has been interpreted assuming that the clay density increases with depth and a maximum Bovey bed thickness of 1245 m is predicted. The western contact of the basin is shown to be faulted with dips of up to 63° and is possibly an extension of the Lustleigh-Sticklepath fault system.

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Section: B Determination Of Rock Densitiesmentioning

confidence: 99%