Abstract

"The south Wales underclays are interpreted as representing allochthonous soils which were deposited by aqueous means before the peat forming flora grew. Their mineral composition is determined mainly by provenance; leaching and weathering were active to only a slight degree. Many of the characteristics of the underclays may be explained by a progressive reduction in the carrying power of the depositing agent. The stratigraphical variation noted in underclay mineralogy is explained by postulating a relatively drier climate in upper Coal Measure times together with derivation from a different source."

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