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Provenance
data were originally published as part of a regional study in Ziegler, A.M., Cocks, L.R.M., and McKerrow, W.S., 1968, The Llandovery Transgression of the Welsh Borderland, Palaeontology, vol. 11, part 5, pp. 736-782.
I have simplified and retooled the presentation to be suitable for undergraduate paleontology.
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Data_sections1thru9