32 PROI EEDINGS OF TORONTO MEETING. 



was meag r. Th( ml ilogy was then outlined. The rocks are metamorphic 



quartzites, slates, it rata, standing vertically and penetrated with bosses of 



granite and dikes of trap. A map drawn to scale illustrated their distribution. Men- 

 tion was also made of the neighboring rocky promontory of Bald Cliff, and this was 

 likewise ill by a map. The microscopical characters of the massive ruck.- were 



bed at length. The granite was ti r- 1 taken up and Bhown t" be a normal 

 granite in the while in the dikes it approximates h granite-porphyry with 



sely crystalline ground-mass and very large phenocrysts. The occurrence 

 ein-flllings on theb irders of the granite, consisting of quartz, feldspar, tourmaline, 

 and muscovite was cited as evidence of fu ma role action. 



The dike- were next treated, some seventy-five or more different ones having been 

 studied. They were shown to In- noncrystalline and porphyritic examples of the 

 oli vine-diabase series, although some departed more or less from the type. Their 



mineralogical c position was discussed at length, the most interesting features being 



the occurrence of brown basaltic hornblende in one or two, and the approximation of 

 the dike- t<i typical camptonites. Some discussion of this latter group followed' 

 Attention was also given to the structure of the dikes in broad and narrow examples, 

 and on edges and in center. While, in general, in the narrow dike- and on the ed 

 a porphyritic facies is to be seen, and in the centers an approximation to granular struc- 

 ture, nevertheless, some of the broadest examples are porphyritic all aero-- and some of 



the narrower ones more granular ; also boi f the very narrow dike- are ipiite holo- 



crystalline, with relatively large phenocrysts of olivine. Three principal types were 

 made out in all : the olivine-diabase, the augite-porphyrite, and the melaphyre, with 

 hornblendic and more randy biotitic departure- from the same. One or two analj 

 were appended : and the paper closed with a brief discussion of the related dike roi 

 hitherto described in this country, ami they were shown to he principally of diabase 

 affinities. A. tabulation of the Eennebunkport dike- by numbers which referred t" the 

 map, with their width- and petrographical determinations, concluded the contribution. 



In the absence of the author, the Secretary then read the following paper: 



lilt BYLVANIA SAND IN CUYAHOGA COUNTY, OHIO. 



T.V PETER Nil i . 



Unquestionably the Sylvania sand is found in the well drilled by the Cleveland 



Dg M I Co at their work- in Newblirg, near Cleveland. Cuyahoga county. 



Ohio. This sand is quartzose, bright and sharp, a good glass -and. It- position is 



in I nd it- pr nee here, however anomalous, i- unmistakable. It 



'Meet below the mouth of the well, and is about forty % feet in thickm 

 I quote from I' I Orton, State Geologist, Geological Survey of Ohio, 



Vol. 



rell-head is aboul ty-fivefeel below the bottom of the Berea grit, and 



Limestone wai reached at I860 feet; -ami at I860 

 t.. I" !' of the latter: " It is a sharply crystalline, unworn 



: which many of the grains are unusuallj t. It matches well in pi 



tion i" the Sylvai I . . . This, it will be borne in mind, is no 



• • buried under 160 or 200 !<■• t of 



