Triplehorn criticizes Cassidy's failure (ibid., v. 52, no.2, p. 295-312, 1968) to quantify the difference between the two major facies of the Excello Shale, questions the role of the 8-ft thick reef as a barrier to sediment transport, and suggests that the use of kaolinite as an indicator of acid conditions in sedimentary rocks needs to be reevaluated.

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