. Bulletin - New York State Museum. Science. GEOLOGY AND GEOGRAPHY OF CLAY DEPOSITS 131 recent, as shown by the contained fossils, and the clay on Little Neck near ISTorthport is Cretaceous as previously noted. The proof of the age of the Glen Cove clay is not absolute. Cretaceous leaves in fragments of ferruginous sandstone have been found along the north shore of Long Island from Great Neck to Montauk Point,* but they are usually much worn and scratched and have evidently been transported from some dis- tant source. The clays at Center Island, West Neck, Fresh Pond and Fisher Island are very
. Bulletin - New York State Museum. Science. GEOLOGY AND GEOGRAPHY OF CLAY DEPOSITS 131 recent, as shown by the contained fossils, and the clay on Little Neck near ISTorthport is Cretaceous as previously noted. The proof of the age of the Glen Cove clay is not absolute. Cretaceous leaves in fragments of ferruginous sandstone have been found along the north shore of Long Island from Great Neck to Montauk Point,* but they are usually much worn and scratched and have evidently been transported from some dis- tant source. The clays at Center Island, West Neck, Fresh Pond and Fisher Island are very similar in appearance and com- position, are very probably of the same age, possibly Tertiary,f but we lack palaeontologic or stratigraphic evidence. At West Neck the clay underlies the yellow gravel and the latter is covered by the drift, so that is pre pleistocene. The theory has been put forth that the Cretaceous formation on Long Island would be found north of a line joining the southern border of the Cretaceous formation of New Jersey and Martha's Yineyard,:}: and that outcrops south of this might be Tertiary; in view, however, of determining the clay at Little Neck near Northport to be Cretaceous, we must abandon this Folded clays, 'Vest Neck, An interesting phenomenon is the tilting and crumpling of the strata on the north shore of Long Island. This disturbance is especially well shown on West Neck and was considered by Dr. Merrill to be due to the pressure of the advancing ice sht!et,§ which excavated the deep narrow bays and pushed the * A Holllck, Notes on Geology of North Shore of Long Island, Trans. N. Y. Acad. Sci., Xm. tThlB Idea is also expressed by Dr. Merrill. X A. HoUick, Notes on 'Geology of North Shore of Long Island, Trans. N. Y. Acad Sci. XIIL § Geology of Long Island, Ann. N. Y. Acad. Sci. 188*.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
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