The book Geological Society of America Bulletin 1 (1890) was written by author Geological Society of America Here you can read free online of Geological Society of America Bulletin 1 (1890) book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Geological Society of America Bulletin 1 (1890) a good or bad book?
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They would grow forward by con- tinued addition of oblique layers to their sloping front; as the front ad- vanced they would slowly grow upward by the addition of essentially hori- zontal layers, after the fashion of ordinary deltas, in order to maintain a gentle surface slope from head to front ; and as the ice melted away, the space that it evacuated at the head of the delta would be more or less com- pletely filled by a backward growth at that part. If the feeding streams came from beneath t...he ice they must needs rise to flow over the delta surface to its front, and hence the backward growth at the head must have been at such points in the form of up-hill deposition. These three classes of deposits may be called fore-set, top-set, and back-set beds, shown in fig. 1 ; and it is FiouBB I.— Ideal Longitudinal Section of a Sand Plain. manifest that the ratio of fore- sets to back-sets must be the same as the ratio of the forward growth of the delta to the backward melting of the ice.
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