JVM 



SCIENTIFIC SURVEY. 



Fig. 39. 



247 



Section through Ingraham's and Rankin's Quarries. 



aa. Taconic argillo-micaceous schist. 



c. Ingraham's limestone quarry. 



d. Limestone — north end of the Meadows quarries. 



e. Rankin's limestone quarry. 

 /. Quartz rock. 



Fig. 40. 



JVV. 



S.£. 



Section across Chickawakie Pond. 



aaaa. Taconic argillo-micaceous schist. 



b. Limestone. 



c. Quartz rock. 



d. Chickawakie pond. 



e. Jameson's point. 



and not at great distances apart. Fig. 37 extends through the 

 Beechwoods quarry, from Ash point in South Thomaston to a saw 

 mill on Oyster river, just in the edge of Warren. At the two ends 

 we have the Azoic rocks, gneiss on one side, and mica schist with 

 granite on the other. Then what we suppose to be the oldest 

 Taconic rock appears — the quartz rock, near the West Keag river, 

 underlying the Marsh quarry of dolomite. This rock may possibly 

 be repeated at the west end of the Taconic schists adjacent to the 

 gneiss. The rocks being concealed we could not determine this 

 point. The rocks appear to have a synclinal structure, the quartz 

 running beneath both the Eolian limestone and the schists. It is 

 possible that the most western of the schists are synchronous with 

 the quartz ; or may have been changed into the latter by metamor- 

 phic action upon one side of the axis and not upon the other. It 

 is not uncommon to find interstratified with the Taconic quartz 

 rock, in other parts of the country, schists very similar to those of 

 the upper part of the series. Above the quartz rock, and to the 

 left hand in the figure, occurs a large bed of dolomite ; then suc- 

 ceeds the Taconic schists with at least two beds of limestone, 



