32 NEW YORK STATE MUSEUM 



In the quarry by the road 3 miles north of Keene, and also in 

 ledges by or near the road one-half to two-thirds of a mile north 

 of the quarry, the VVhiteface anorthosite contains numerous bunches 

 or lenses of Grenville, usually less than a foot long, as distinct 

 inclusions. 



Near the southeastern end of the Grertville area 2 miles due 

 north of Keene, and also by the road in the mixed gneiss area i^^ 

 miles southwest of Upper Jay, the anorthosite contains numerous 

 sharply defined inclusions of Grenville gneiss and some of lime- 

 stone. Most of these are less than 2 or 3 feet across. 



In The Flume southwest of Wilmington, and also in the mixed 

 gneiss area 2^ to 33^ miles west-northwest of Wilmington, por- 

 tions of the anorthosite contain small lenses or irregular masses of 

 Grenville green pyroxene gneiss. 



♦ Just west of the bridge at Franklin Falls the big ledges of White- 

 face anorthosite contain a number of clearly defined bands or lenses 

 of Grenville gneisses from a few inches wide and long, to 7 or 8 

 feet wide and 10 or 20 feet long (see plate 11). These inclusions 

 are mostly gray quartz- feldspar-biotite gneiss, white feldspar- 

 quartz-garnet gneiss, and quartzitic gneisses. 



A big ledge of Grenville hornblende gneiss on the western shore 

 of the river i mile south of Upper Jay is clearly intruded by a 

 dike of Whiteface anorthosite 20 feet wide, this doubtless being 

 an off-shoot from the anorthosite body just to the north. 



In the areas of Grenville-anorthosite mixed gneisses, the Gren- 

 ville rocks are literally cut to pieces by, and often injected with, 

 much anorthosite, so that a separate mapping of the two forma- 

 tions is rendered impossible. Areas of this sort are considered 

 below. 



The above phenomena, mentioned somewhat in detail, strongly 

 support the view that the anorthosite is, in the strict sense of the 

 term, an intrusive body. Such evidence is directly opposed to the 

 hypothesis of origin of the anorthosite as advocated by Bowen 

 (see above). 



The anorthosite older than the syenite-granite series. That the 

 anorthosite is older than the syenite-granite series (described 

 beyond) is conclusively proved both by tongues or dikes of syenite 

 and granite cutting the anorthosite, and by inclusions of anorthosite 

 in the syenite and granite. Several excellent examples of tongues 

 of syenite and granite cutting anorthosite have been discovered 

 by the writer within the quadrangle. These are of particidar inter- 

 est and importance because they constitute the only known evi- 



