Outline history of Utica and vicinity . s, and therefore all the stratified fossil- i^ Tra^^^cT bearing rocks run across it in southeast and northwest s.,1887-9, bands, gradually assuming a more nearly east and west direction. The strata slope gently southward. About the slowly-sinking shores of the Adirondackisland, in the shallow, sandy water, the Cambrian rocks,including the Potsdam sandstone, were in modern geologic research is more interestingthan the study of the Cambrian rocks, by C. D. Walcott,W. B. Dwight, and S. W. Ford, who have shown that state Museum ,. rir^.j 11
Outline history of Utica and vicinity . s, and therefore all the stratified fossil- i^ Tra^^^cT bearing rocks run across it in southeast and northwest s.,1887-9, bands, gradually assuming a more nearly east and west direction. The strata slope gently southward. About the slowly-sinking shores of the Adirondackisland, in the shallow, sandy water, the Cambrian rocks,including the Potsdam sandstone, were in modern geologic research is more interestingthan the study of the Cambrian rocks, by C. D. Walcott,W. B. Dwight, and S. W. Ford, who have shown that state Museum ,. rir^.j 11 i^ i Buiietin,, many limestones of the State, as well as sandstones, be- No. iq, p 145. long to this period. It is believed, however, that this formation is wanting in Oneida County, where the waters were becoming deep enough to favor the formation of the Trenton beds. The opening of the Lower Silurian age is marked in thisregion by the deposition of an impure, sandy or grittylimestone, the calciferous sand-rock. This appears, in. SHERMAN Fall, Trenton falls. lhotot;ra|)li of N. II. I artoii GEOLOGY. I4I Oneida County, only in the bed of the West Canada creek, on the boundary Hne of Herkimer County. It ovedies the ^ p Brigham up-thrust Archaean rock at Little Falls, and in its inter-i^ Trans, stices are found there and at Middleville the quartz crystals called Little Falls diamonds. It is known by its brownish color, and the rough, knotty appearance due to the weathering off of particles of lime, leaving the sandy portions. The purer limestones of the Trenton group were nextdeposited. These were formed by organic life, just aslimestone is being formed in coral seas to-day. (SeeDanas Corals and Coral Islands.) The average depth ec^Text-borkof the sea-bottom must have been at least lOO feet, and itP-^ probable that the climate of the region was warm. Thethickness of the deposit favors the belief that the reefs ^^ , ,. , ^ Danas Lorals were sinking at about the sam
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