wai.cott.1 SUMMARY ADIRONDACK SUB-PROVINCE. 345 



upper fauna occurs in the upper portion of No. 17 of the following sec- 

 tion and the lower in the lower part of No. 15. This is the relative 

 position of the same subfaunas in the Wisconsin section. 

 Section beginning below lower lock of canal at Whitehall : 



Ft. In. 



(1) Massive bedded, compact, dark steel gray sandstone, almost a qnartzito. 25 



(2) Dark clay shale .-. G 



(3) Bluish gray, brecciated limestone 6 



(4) Fine grained, compact, steel gray limestone 1 



(5) Compact, arenaceous limestone 3 



(6) Compact, fine grained, steel gray sandstone in layers of 6 inches to 3 feet. 



Partings of coarser sandstone and small, flattened clay concretions 

 occur, also streaks of light-colored sandstone in the layers, and cross- 

 bedding is of common occurrence 14 5 



Annelid trails on the surface of the layers. 



Strike N. 20° E. ; dip 6° to 8° E. 



(7) Calciferous sandstone in one layer 2 7 



( 8) Fine grained, compact, steel gray sandstone *. 20 



(9) Thin bedded sandstone and clay shale 1 3 



(10) Compact, gray and purplish, fine grained sandstone, streaked with dark 



sandstone and shaly matter ; slightly calcareous in places 16 6 



(11) Dark gray calciferous layers, weathering to a reddish brown sandstone.. 2 



Annelid trails and borings. 



(12) Gray, compact sandstone 1 3 



(13) Dark gray, calciferous layers, weathering to a reddish brown sandstone. 1 4 



Annelid trails and borings. 



(14) Hard, compact, gray sandstone, in evenly bedded layers 6 inches to 3 feet 



in thickness of the division of the typical Potsdam sandstone. Sum- 

 mit near crossing of private roadway 59 8 



(15) Sandstones similar to 14, but with few alternating calcareous layers ; the 



calcareous matter decomposing and leaving streaks of reddish and 

 brown rocks in the layers 113 



Ripple marks occur on the surface of many layers and annelid 

 trails on the calcareous strata, About 30 feet up found Palceacmcea 

 lypica, H. and W. 



Strike 25° E.; dip 10° E. 



The light gray compact limestone, with the little flattened concre- 

 tions of clay and the cross-bedding, give this portion of the section a 

 striking resemblance to that of the upper 150 feet of the Keeseville 

 section. 

 •(16) Lead colored calciferous sandstone, weathering rough 5 



(17) Alternating, gray, compact, fine grained sandstone, reddish coarse sand- 



stone and finer calcareous sandy layers. Lingulepis acuminata and 

 rtychoparia sp ? occur in the upper layers, about 40 feet up 70 



332 5 

 Calciferous. 



(18) Calciferous sandstone with a massive bedded light gray compact sand- 



stone; at top 10 feet thick 40 



The upper 30 feet of 17 and all of 18 may be considered as the pass- 

 age beds to the calciferous sandstone above. 



(1) Lead colored, massive bedded, calciferous sandstone 230 



(2) Lead colored, brecciated limestone overlain by a compact light gray lime- 



stone 20 



290 



