[Annals N. Y. Acad. Sci., Vol. XVII, No. 5, Part II, pp. 519-562, Pll. 

 XXXI and XXXII. Published September 10, 1907.] 



A CONTRIBUTION TO THE GEOLOGY OF SOUTHERN 



MAINE. 



By I. H. Ogilvie, Ph.D. 

 Introduction. 



The aim of this paper is to set forth the salient features of 

 the geology of a small area in southern Maine from the points 

 of view of physiography, chemico-mineralogical petrology and 

 metamorphism, respectively. On the petrological side, the 

 igneous rocks are those especially considered, and all questions 

 of structure or stratigraphy among the sedimentary schists are 

 omitted. 



The area discussed comprises that part of the Boothbay quad- 

 rangle which lies between the Sheepscot and the Damariscotta 

 river. The region is one of the typical examples of a fiord 

 coast, while its rocks are a metamorphic complex of schists and 

 gneisses, together with dike and plutonic igneous rocks ranging 

 in composition from aplite to dunite. The purpose of the map 

 is to illustrate the rock types described. It is not intended as a 

 complete geological map of the region. 



The field work was done during the summer of 1905, the writer 

 being assisted by K. I. Cook and M. W. Adams. Microscopical 

 and chemical work has been carried on during the past two 

 winters in the laboratories of Columbia University. Prof. A. 

 W. Grabau of Columbia University had previously visited the 

 region with a summer field class from the Teachers' School of 

 Science of the Boston Society of Natural History, and he 

 kindly placed his specimens and notes at the writer's disposal. 

 The map of Cabbage Island (Fig. 1.) was worked out by this 

 class, and the diabase dikes on Linekin's Bay were found by 

 him. Most of the rock types of the region were included in Dr. 



519 



