648 Granite at Mounts Adam and Eve. 



G. H. Williams (1. c, p. 33), is exactly the same that is so often 

 mentioned in these pages. Nason mentions also the development 

 of scapolite in limestone, next the great trap dike at Rudeville, near 

 Hamburg, N. J. (1. c., p. 33). J. F. Kemp has already cited such 

 from Yan Artsdalen's quarry, Bucks Co., Penna.,^ where the min- 

 erals are practically the same and norite is near. On Lake Cham- 

 plain, especially near Port Henry, such aggregates are very promi- 

 nent features of the limestone near the gabbro intrusions.'^ Gr. H. 

 Williams mentions as the result of the intrusion of mica-diorite and 

 peridotite into the Cambrian limestones of Stony Point, N. Y.,' 

 pale pyroxene (malacolite), light green hornblende, zoisite, sphene, 

 and quite abundant scapolite, a practical repetition of the contacts 

 at Mt. Adam and Mt. Eve. 



It is in Spain, France, and Norway that the most interesting 

 parallels are found. For many years the rich development of scap- 

 olite (dipyr, couseranite) in the Mesozoic limestone of the Pyrenees 

 along intrusions of granite, nepheline syenite, and ophite (diabase) 

 has been known — Zirkel,* Lacroix,' Frossard,^ and others have de- 

 scribed them. Zirkel mentions, on a granite contact (1. c, p. 201), 

 tremolite, epidote, and couseranite, and again, p. 205, dipyr in 

 crystals over an inch long. Along the contacts with the ophite, 

 the coarsely crystalline limestones are charged with dipyr, couser- 

 anite, green hornblende, pyrite, w^hite mica and a little quartz 

 (p. 206). Lacroix mentions a zone formed of brecciated limestone, 

 containing great crystals of dipyre, also actinolite, pyrite, etc. 

 Frossard gives a quite extended list of minerals, and cites dipyre 

 and couseranite. 



Probably the best known of all developments of scapolite are in 

 Norway in association with the great deposits of apatite, whose 

 geology has been such a difficult problem. A very complete review 



1 Trans. N. Y. Acad. Sci., xii, 74, Jan. 1893. 



2 J. F. Kemp, Grabbros on the West Shore of Lake Champlain, Bull. Geol. 

 Soc. Amer., v, Boston Meeting. 



* Gr. H. Williams, Contact Phenomena of the Cortland Series, Amer. Journ. 

 Sci., Oct. 1888, p. 267. 



* F. Zirkel, Beitrage zur geolog. Kenntniss der Pyrenaen Zeit. d. d. g. Ges., 

 xix, 68-216, 1867. 



5 A. Lacroix, Description des Syenites n^pheliniques de Pouzac, etc., Bull. 

 Geol. Soc. de France, 1890, 511. 



^ C. L. Frossard, Sur les Roches metamorphiques de Pouzac, etc., Comptea 

 Rendus, ex, 1890, 1013. 



