I have read with interest the paper on “Early Pennsylvanian Sediments West of the Nemaha Granite Ridge, Kansas,” by R. C. Moore.1 It enunciates principles which I believe will be a great aid to a study of these sediments, and in particular I concur with the conclusion that the early Pennsylvanian of this area cannot be correlated unit for unit with the beds appearing at the outcrop in eastern Kansas.
The place of origin of the author’s proposed “Welch chert” is in part, I believe, well taken. However, I think that much of these sediments may well have come...
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