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A re‐interpretation of the origin of sands and gravels around Banc‐y‐warren, near Cardigan, west Wales
Author(s) -
Helm D. G.,
Roberts B.
Publication year - 1975
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350100203
Subject(s) - geology , interpretation (philosophy) , archaeology , geochemistry , geography , philosophy , linguistics
The sands and gravels form part of a once more continuous succession comprising parts of three delta lobes which advanced into a deepening pro‐glacial lake. Normal delta construction was accompanied by sporadic rapid mass movement of coarse sediment. This generated turbidity currents which gouged and filled remarkable channels. The deposits are cut by a very large number of normal faults which bear a strike relationship to the bedding showing they were produced by down‐dip extension of the beds as a result of slope instability. The consistently southwesterly current directions, deduced from various sedimentary structures, and the constant strike orientation of faults together show that the mounds cannot be ice‐contact features as was previously widely believed. The external form of the deposits is related more to subsequent erosion than to their original mode of formation.