Abstract

Studies of Ludlovian (Silurian) and younger Downtonian sedimentary rocks in South Wales show that the distribution of certain heavy minerals, particularly garnet, is a direct reflection of rock lithology. The influence of intrastratal solution upon garnet is illustrated by means of photomicrographs from both Welsh and Scottish rocks. The evidence indicates that for ancient indurated or strongly compacted sediments the use of heavy minerals for stratigraphic correlation and provenance studies may be of limited value.

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