380 FREDERIC 11. I.AIIEE 



having a largo proportion of its pebbles and bowlders consisting 

 o\ effusive rocks, and having a paste which resembles the Parker 

 Hill white schist (cf. above), is a coarse p\ roclastic. an agglomer- 

 ate, rather than a tillite ? 



It is important to note that both Hitchcock and Hawes 1 main 

 tained that rocks ot" the Lyman group were the outcome of the 

 metamorphism ot" sediments. Neither oi these geologists held 

 the view that these schists were ot' volcanic origin, yet both were 

 struck by the resemblance between some members of the series 

 and ordinary Eelsite. 



Sl-KLVITKU RELATIONS OV lllK LYMAN SF.RIES 



The structural relations, and therefore the age. of the Lyman 

 schists still remain obscure. These rocks arc surely not younger 

 than Devonian, and they may be older, as has been stated by 

 Hitchcock. In several places on the Parker Hill-Mormon Hill 

 range stratigraphie structures point to an anticlinal axis eastward. 

 If this is so. since the blueberry Mountain-Bald Hill range is 

 regarded as synclinal, the intervening valley is anticlinal. Again. 

 if this is so. it becomes necessary to explain the lack of correlation 

 between the Lyman schists on the western range and the marine 

 argillites and sandstones of the eastern range. Unconformity or 

 extensive faulting may be the cause. At present I do not feel 

 justified in discussing this subject further. More time should be 

 given to held investigation. The region offers ample opportunity 

 for research in petrology and in structural geology. 



ACIOIC EFFUSIVE ROCKS FAST OF THE APPALACHIAN PROTAXIS 



South of the latitude of New York City the Appalachian 

 Mountains are flanked on the east by the Piedmont Plateau. 

 North of the same latitude, the New England Province corresponds 

 to the Plateau, both regions are underlain by plutonic rocks and 

 folded, sheared, sedimentary rocks, chiefly of Paleozoic and pre- 

 Cambrian age. With extended study of these complex rocks two 

 results stand out conspicuously: an increasing number of meta- 



• C. II. Hitchcock, Btttl. G Sto Am., XV (1904), 468, 400; and G. W. 



Hawes, "Mineralogy and tithology of Xew Hampshire." p. 170. in Hitchcock's 

 \ . . ! ! HI (1878). 



