SCIENTIFIC SURVEY. „.- 



241 



third extends from soutl. of Crawford's pond to north of Hope 

 Lake. Tf tliore is a fourtli it embraces the Hope and Lincohiville 

 beds. It is eurions that the dip of the different beds in all those 

 lines is difibrent. That in tlie valley of the St. George river dips 

 in opposite directions away from each other, makiii^^ an anti(;linal ; 

 BO do those on the Crawlbrd pond ran{,re ; while the Lincolnville 

 and Hope beds dip towards each other, and the In^raham corner 

 and Warren beds dip in the same din-ction essentially. Fig. 35 

 shows that the Hope and Apph'ton buds are distinct from 1'ach 

 other. The Crawford pond and St. George river ranges may make 

 a great synclinal axis with each other ; and if the former is con- 

 nected at all with the Ingrahain corner range the coimoction is not 

 obvious. The study of the connection between diflerent beds of 

 limestone may not only indicate the number of folds in the older 

 strata, but may also lead to the discovery of more limestone now 

 concealed from view by the soil. We hope that tlu'se glimpses of 

 connection between the various limestone beds of this vicinily may 

 lead some resident to work out the relations more fully. 



4. Quartz Ruck, (Tacunic.) 



Three belts of this Quartz Rr)ck are represented npon our map. 

 One is between the two belts of Kolian limestone in Kockland and 

 Thomaston ; another extends from South Tliomaston, g(!nerally 

 along the shore of Penobscot bay, with an occasional subuKirgence 

 beneath the salt water, to Rockport ; and the third is an isolated 

 outlier in ('amden, forming Mount Battie. In the west part of 

 Thomaston is a considerable thickness of quartz rock not repre- 

 sented. 



The best characterized locality of quartz rock is near the south 

 end of the first belt, near West Keag river .in South Thomaston. 

 The hill south and west from the dolomite quarry, (Marsh quarry,) 

 is the place where it crops out so finely. The rock is a sand- 

 stone, very much like the white purely silicious Potsdam sand- 

 stone about Lake Champlain. It has numerous minute crystals 

 of magnetite scattered through it. It dips 75° N. 60° W., and its 

 relations to the adjacent strata are given in Pig. 3Y. It appears to 

 overlie some of the older mica schist, and to nnderlie the Taconic 

 schist and dolomitic limestone. This locality is the most promis- 

 ing place we have seen in this rock for the occurrence of fossils. 



81 



