. Bulletin of the Geological Society of America. Geology. 480 E. O. ULRICH REVISION OF THE PALEOZOIC SYSTEMS. mouth of Illinois Eiver/^ probably pinches out or be- comes unrecognizable in the vicinity of Hannibal, Mis- souri. The facts in hand are explained as follows: 1. The whole series repre- sents uninterrupted deposi- tion in and adjacent to an advancing shallow sea. 2. The Everton, with its basal layer of sand^ represents deposition in embayments while the sea was still con- fined to areas south of Mis- souri. 3. The St. Peter sandstone is a well developed beach formed of wind-transporte
. Bulletin of the Geological Society of America. Geology. 480 E. O. ULRICH REVISION OF THE PALEOZOIC SYSTEMS. mouth of Illinois Eiver/^ probably pinches out or be- comes unrecognizable in the vicinity of Hannibal, Mis- souri. The facts in hand are explained as follows: 1. The whole series repre- sents uninterrupted deposi- tion in and adjacent to an advancing shallow sea. 2. The Everton, with its basal layer of sand^ represents deposition in embayments while the sea was still con- fined to areas south of Mis- souri. 3. The St. Peter sandstone is a well developed beach formed of wind-transported quartz grains from the north. 4. In the early part of ihU stage the beach seems to have gained on and possibly over- come the advance of the sea in northern Arkansas, but subsequently it was itself progressively drowned and its development pushed north- ward to some line beyond the present limits of the St. Peter. 5. Finally, the Joachim represents off-shore deposi- tion during the latter half of the time consumed in the tan- gential deposition of the St. Peter beach sands. ^^ Apparently this is the formation to which the name Folly limestone was applied by C. R. Keyes (Proc. Iowa Acad. Sci., vol. v, 1898, p. 61).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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