Tree root structures on a Dinantian palaeokarst, Urswick Limestone, south Cumbria (original) (raw)

Proceedings of the Yorkshire Geological Society, 1989

Abstract

SUMMARY Circular to elliptical pits with raised rims, up to 80 cm across, occur on a palaeokarstic surface in the Asbian Urswick Limestone near Grange-over-Sands, Cumbria. The raised rims consist of laminated micritic carbonate resembling laminar calcrete but with sub-vertical laminae. The pits and their raised rims are interpreted as structures formed by tree roots (rhizocretions). Their presence indicates subaerial exposure for sufficient time and under conditions favourable for the growth of mature trees.

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