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Journal of the Geological Society

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Clay mineral assemblages of the Townsend Tuff Bed (Lower Old Red Sandstone), South Wales and the Welsh Borders

Suites of samples from the Townsend Tuff Bed possess widely varying clay mineralogies, which may be divided into 5 major assemblages showing a general increase in diagenetic grade (from smectite/illite/kaolinite to chlorite/illite) to the W. This trend appears to be related to depth of burial. fold style and proximity to basement. Illite crystallinity closely parallels cleavage development.

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