. Annals of the New York Academy of Sciences. Science; Science -- New York (State). ROGERS, GEOLOGY OF THE CORTLANDT SERIES 59 they all belong to the same series. The norites occupy a central position in the area, being flanked by diorite and pyroxenite, and often, at least, protected on the north and south by more acid rocks. The biotite augite norite magma is the largest and is closely connected with the norite proper and the biotite norite; while the hornblende norite shows closer affinities with the diorites. The pyroxenites comprise the eastern third of the series, and possibly likewise e
. Annals of the New York Academy of Sciences. Science; Science -- New York (State). ROGERS, GEOLOGY OF THE CORTLANDT SERIES 59 they all belong to the same series. The norites occupy a central position in the area, being flanked by diorite and pyroxenite, and often, at least, protected on the north and south by more acid rocks. The biotite augite norite magma is the largest and is closely connected with the norite proper and the biotite norite; while the hornblende norite shows closer affinities with the diorites. The pyroxenites comprise the eastern third of the series, and possibly likewise extend to the west, since they are found on BC DEFG HI K. 40 45 SO 55" 60 65 70 Fig. 3. Variation Diagram of the Cortlandt Series A = Diorite; B = Hornblende Norite; C = Biotite Norite; D = Olivine Pyroxenite; E = Pyroxenite; F = Biotite Augite Norite; G = Norite; H = Gabbro; I = Augite Norite; K = Granite. (The rocks of tbe New Jersey and Connecticut extensions of the series are not included.) Montrose Point and again across the river, on Stony Point. They be- come chrysolitic in apparently irregular patches. Finally, the diorites occupy an area to the west which contains most of the inclusions of the district; and in several places where there is reason to believe that inclu- sions have existed but have been absorbed, diorite is also found. Gabbro is found in two cases next to the limestone, and in two others adjoining schist, while syenite is in an analogous location. The problem suggested by the location of these last rocks is a difficult one to solve. According to Harker,45 the hybrid formed by the absorption 46 Jour. Geol., VIII, 380-399. 1900. Also Nat. Hist, of Ign. Rocks, Chap. XIV. 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 New York Academy of Sciences; Casey, Thos. L. (Thomas Linco
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