368 FREDERIC II. I.MIEE 



2. These Lymail schists are broadly exposed in the area north- 

 west of the Blueberry Mountain-Bald Hill range and its south- 

 west ward extension. 



3. Hitherto the Lyman series has been regarded as a group 

 of metamorphosed sedimentary rocks. 



4. Field evidence, megascopic examination of hand specimens, 

 and microscopic examination of thin sections indicate that the 

 Lyman series contains interbedded members which appear to be 

 of volcanic origin. 



5. These metamorphosed volcanic rocks include, among others, 

 species related to the quartz keratophyres and the keratophyres, 

 and probably also tuffs and agglomerates of similar composition. 



6. It seems more reasonable to attribute the origin of the coarse 

 conglomerate schist near Young's Pond, Lyman, to vulcanism 

 than to glaciation. 



7. The association of acidic effusives with the Paleozoic rocks 

 east of the main Appalachian protaxis is not exceptional for New 

 Hampshire. Such effusives are found in Maine, in the Maritime 

 Provinces of Canada, and in the Piedmont Plateau of our middle 

 and southern Atlantic border states. 



THE LISBON AND LYMAN SERIES 



On the northwestern side of the Blueberry Mountain formation 1 

 are highly metamorphosed greenish and whitish schists which out- 

 crop over many square miles. The greenish varieties are often 

 chloritic. They and certain other associated rocks were called 

 by Hitchcock the "Lisbon group." The whitish schists belong 

 to his "Lyman group." In his earlier reports he relegated these 

 two formations to the Huronian, 2 the Lyman group being con- 

 sidered the younger member; but subsequently he referred them 

 to the Cambrian or to the Ordovician, 3 and concluded that "the 

 Lyman schists .... do not represent a stratigraphical terrane"; 

 the term "is a petrographies! designation." 4 



1 \- . II. 1. alioo, op. cit. 



3 C. H. Hitchcock, Geology of New Hampshire (1S77), II, 277. 

 ' Ibid.; Geology of Littleton. View Hampshire, reprint from the History of Littleton 

 (io^), PP. "1 »9- 

 * Ibid., p. 31. 



