Ailing — Problems of Adirondack Precambrian. 53 



green quartzite separates the 20 feet seam into two more 

 or less distinct strata. A similar state of affairs was 

 observed on the George W. Smith property. 



Probably the most erratic member of the series is the 

 Faxon limestone. At its typical locality along the shore 

 of Faxon Pond, near Graphite, Warren Co., it lies above 

 the " Dixon,' ' bnt it is absent at Hague as well as at the 

 mines in the South Bay district, along the shore of Lake 

 Champlain. At Hague there is an increased feldspathic 

 content in the lower beds of the Swede Pond quartzite. 

 It is possible that this feldspar schist (which could by 

 analogy to " quartzite' ' be called an "arkosite") is the 

 stratigraphic equivalent of the Faxon limestone. The 

 presence of the Faxon seems to be confined to the interior 

 of the area. Farther west, 3% miles west-northwest of 

 Pottersville on the southern edge of the Schroon Lake 

 sheet (International Graphite Company's mine) the 

 Faxon is represented by two beds of paramphibolite, 

 separated by a stratum of limestone. The group taken 

 en masse is considerably thicker than the same formation 

 exposed farther east. Here the Faxon appears to be 

 replacing the Swede Pond quartzite by progressive over- 

 lap. One interpretation of these observations is that the 

 old shore of the Grenville sea was to the east; that the 

 limestone was deposited in relatively deep water, while 

 the arkosic sands accumulated under near-shore condi- 

 tions. "Kemp has already emphasized the greater 

 abundance of quartzose [para-] gneisses on the east." 8 

 Besides this variation in thickness and occurrence of the 

 Faxon it seems to depart from its normal position in 

 some localities and occur within the graphite schist and 

 even beneath it as well. The Chesterfield limestone of 

 the Smith property thus may be equivalent to the Faxon. 



The Hague gneiss, typically shown at Hague and at 

 Graphite, is a very interesting rock as already pointed 

 out by Kemp. 9 Besides quartz, feldspar and garnet it 

 contains long slender needles of sillimanite. In its char- 

 acteristic development it forms the footwall of the 

 "Dixon" schist at most of the graphite properties. At 

 the Rowland Graphite Company's abandoned mine, 

 Johnsburg, "Warren Co. (North Creek quadrangle), it 



8 dishing, H. P. : N. Y. State Mus., Bull. 95, p. 298, 1904. 



9 Kemp, J. F.: U. S. Geol. Surv., Bull. 225, p. 513, 1903. Kemp and 

 Newland: N. Y. State 51st Ann. Eept. II, p. 539, 1897. 



