Portsmouth Basin, Me. and N. H. 145 



ing. The thickness cannot be accurately stated. In a 

 section from Godfrey's Cove northwest to the contact of 

 the sediments with the granites, a distance of eight miles, 

 the rocks dip almost invariably steeply to the northwest, 

 and although several folds seem to be indicated, the 

 covering of glacial drift obscures the structure. Along 

 the coast where outcrops are more numerous a duplica- 

 tion of lithologically similar rocks appears at such inter- 

 vals as to suggest that the formation has a thickness of 

 about 2000 feet. 



The lower limit of the Kittery could not be established : 

 in the southeastern part of the area the formation is 

 seemingly a faulted contact with the Rye gneiss ; in the 

 northwestern part it appears to stand in a faulted 

 relationship to the Berwick gneiss. Multitudes of dikes 

 cut this formation. 



Eliot Phyllite. — This phyllite is typically developed 

 in the town of Eliot, Maine. It is, as a rule, gray in 

 color but red, brown, black, and buff phases are common. 

 Slight variations in texture and composition are observed 

 and in the formation calcareous and carbonaceous phyl- 

 lites, true slates, and a light yellow to brown gray 

 crumpled and easily eroded argillite have been included. 

 Quartz veins and dikes are frequently seen cutting the 

 formation. Because of the lack of exposures it becomes 

 difficult to establish a standard section, and hence the 

 thickness can at best merely be estimated. South of 

 Eliot where exposures are most numerous the thickness 

 would seem not to exceed 2500 feet. Since the passage 

 from quartzite to phyllite is effected by transitional beds 

 which gradually change from quartzite with thin beds 

 of phyllite to homogeneous phyllite or shale, and because 

 the prevalent dips are such as to carry the quartzite 

 constantly beneath the shale or phyllite, it seems certain 

 that the Eliot and Kittery formations are conformable 

 and that the Eliot is the younger. 



Igneous Rocks. 



General Statement. — The igneous rocks of the area 

 include a great many dikes, several subjacent bodies, 

 a few effusives, and some mixed gneisses. The mixed 

 gneisses are pre-Carboniferous in age and occur in the 



