Annual report . this section the crystallinecrinoidal layer of the Manlius section does not appear at all and theStromatopora beds have a greater thickness; in fact, almost theentire thickness of 50 feet shows Stromatopora in abundance. AtJamesville, a few miles farther west, the thickness is 40 feet and atBrittons quarry, 3 miles farther west, it is 12 feet. At the SplitRock quarries on the west side of the Syracuse quadrangle it is notpresent at all, as the Onondaga limestone rests directly upon theManlius waterlime. ORISKANY SANDSTONE The Oriskany sandstone occupies the interval between the
Annual report . this section the crystallinecrinoidal layer of the Manlius section does not appear at all and theStromatopora beds have a greater thickness; in fact, almost theentire thickness of 50 feet shows Stromatopora in abundance. AtJamesville, a few miles farther west, the thickness is 40 feet and atBrittons quarry, 3 miles farther west, it is 12 feet. At the SplitRock quarries on the west side of the Syracuse quadrangle it is notpresent at all, as the Onondaga limestone rests directly upon theManlius waterlime. ORISKANY SANDSTONE The Oriskany sandstone occupies the interval between the Helder-berg-Manlius limestones below and the crystalline Onondaga lime-stone above, and, in connection with the Onondaga limestone, formsthe best key rock in working out the stratigraphy of the area. It isa coarse-grained sandstone lying in the midst of a great thicknessof limestones and its position in the column need never be mistaken. 1 Loc. cit. 2 American Paleontology. Bui. 19. Ithaca, N. Y. 1904. Plate 3. In Brittons limestone quarry 3 miles south of Syracuse. The partabove the mans head is the Stromatopora limestone (Helderbergian(?)). The lower layers are the Manlius waterlime, the middle layer acompact blue limestone. ( ? • ? fii - 6 • , j frf ?; . ^ * a ^^AsNsi /i i m^*t HB* 5l£ 1 1 • S^.jfl > **#& & Mm jjfc: it-* ?? •/•* ; ^H^^uf Pre , -|. # (E*.: J Wfi ! . fc kf J mm m BBtkS iJsmH;WjI 62£k?fK u 4 n o .O s O J! THE GEOLOGY OF THE SYRACUSE QUADRANGLE 21 The prevailing color of the Oriskany is a light gray, generallywith a yellowish stain from the hydrous iron oxid. In two placesin the Syracuse region it has a reddish tint from the small admix-ture of red hematite. In a few places it contains some pyrite crys-tals which on the weathered surface have oxidized to the yellowishbrown oxid. In nearly every exposure where there is any appreciable thicknessof the Oriskany, it contains black nodules of calcium phosphate,nodules varying from a fraction of an
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