Annual report . ize and form of thelarge porphyritic olivine crystals appear to be identical in both;the ground mass of both also has the same appearance, containingin each case an abundance of opaque and transparent octahedralcrystals. Nevertheless, certain mineralogical differences are appar-ent. The pyrope with its alteration rim, described by Mr Diller,is wanting in the Syracuse rock; ilmenite too, estimated to per cent of the Kentucky peridotite, was not detected in the Syra-cuse occurrence. On the other hand, biotite and enstatite are muchmore important constituents in the lat
Annual report . ize and form of thelarge porphyritic olivine crystals appear to be identical in both;the ground mass of both also has the same appearance, containingin each case an abundance of opaque and transparent octahedralcrystals. Nevertheless, certain mineralogical differences are appar-ent. The pyrope with its alteration rim, described by Mr Diller,is wanting in the Syracuse rock; ilmenite too, estimated to per cent of the Kentucky peridotite, was not detected in the Syra-cuse occurrence. On the other hand, biotite and enstatite are muchmore important constituents in the latter than in the former. . 1 .The little transparent crystals in the Kentucky peridotite are con-sidered by Mr Diller as anatase (octahedrite) while those in theSyracuse rock must, however, be regarded as perofskite. Following Williamss paper were others by J. F. Kemp (35) andby P. F. Schneider (19), (24), (27), (29); D. D. Luther (21);C. H. Smyth, jr (25) ; and E. H. Kraus (31). Plate 18 6j fe$ <Sr»££T t. THE GEOLOGY- OF THE SYRACUSE QUADRANGLE 49 THE DEWITT DIKE In 1894 P. F. Schneider discovered a new occurrence of perido-tite, similar to the Green Street rock, at the Dewitt reservoir. Thisrock was described by N. H. Darton (35) (36) and J. F. Kemp(35). It was also described by Luther in his Report on OnondagaCounty (39) and an analysis of the rock was published by H. in Bulletin 148 of the United States Geological Survey. DESCRIPTION OF THE SYRACUSE AND DEWITT DIKES 1 The Syracuse dike is known to extend about seven-eighths of amile north from Green street; how much farther is not knownowing to the heavy mantle of glacial drift that covers the adjoin-ing area. It is now exposed on Green street in the middle of thestreet and on the bank on the north side of the street. During thepast decade it has been exposed in excavations for sewers alongHighland avenue and Farmer street, some of which extending downto depths of 20 feet or more exposed the fresh unweathered
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