Synopses & Reviews
Synopsis
Excerpt from Transactions of the New York Academy of Sciences, Vol. 7: In Lyceum of National History, October, 1887, to June, 1888
Hill. The slates Of this hill (regarded as Taconic by Dr.
Emmons) are almost certainly of the same age with those of Greenbush Heights, i. E., probably Lorraine although the Utica formation may also here be represented. The hill itself has, un doubtedly, a synclinal structure, but this fact appears not to have been recognized by those who earlier studied it. Over a considerable portion Of its eastern Slope there is a deposit Of limestone (regarded by Emmons as an outlier Of the Calciferous Sandrock resting unconformably upon his Taconic slate) which extends to and forms the summit Of the elevation. This limestone is clearly of Trenton age, and has yielded a large number of Trenton species. The facts presented at this inter esting locality appear to me strongly to favor the view that the Norman's Kill graptolitic Slates are newer than the Trenton lime stone. From twelve to fifteen miles further south (in the Schodack and adjacent regions) there are other Trenton expo sures, some Of which I was at first led to regard as constituting an integral portion of the Lorraine formation, but which I now think are demonstrably not such, involved in the folds which have there profoundly affected the gritty and slaty rocks, in cluding the Norman's Kill graptolite-bearing beds already Spoken Of. The facts learned In eastern New York appear to me to demonstrate very effectually that the Norman's Kill graptolite beds are entirely independent of the Trenton forma tion.
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