474 PROCEEDINGS OF COLUMBUS MEETING. 



Presented by Dr. W. 11. Hobbs, Stab I diversity, Madison, Wis. 



Size, 4.! x 7; inches. 



386. Warner mountain; from Great Barrington, Mass. Searles quarry on the left. 



387. ( 'intact of< 'ambrian 'Silurian) gneiss overlying dolomite : above Searles quarry, 



Great Barrington, Mass. Looking southwest : mount Washington in the dis- 

 tance. The exposures on the left are gneiss, those on the right, either side 

 of derrick, are dolomite. The exposure where crumpled banding in gneiss 

 is best exhibited is seen in the left middle ground. 



388. Crumpled banding in gneiss ; near Searles quarry, north of most northerly 



opening. 



389. Polished slab of calcareous muscovite-biotite gneiss ; from above the Hopkins- 



Searles dolomite quarry at Great Harrington. Mass. The size of the face is 

 about 1x2 feet. A well developed cleavage foliation runs parallel to the 

 side on which the block rests. A nearly straight secondary banding follows 

 this direction. This banding is completely replaced by a crumpled trans- 

 verse banding showing the present position of the original stratification 

 plane. The course of the crumpled quartz lenses can be followed parallel to 

 that of the crumpled banding (published as plate 14 of this volume). 



390. < marry in Cambrian gneiss: above Searles quarry. Great Barrington, Mass. 



Shows perfect foliation and straight lamination, dipping toward the right, 

 and in the lower right-hand corner the straight lamination is replaced by a 

 crumpled banding which is parallel to the two scries of quartz lenses and 

 dips westward 40°-60°, conformably with overlying dolomite 100 feet west- 

 ward. The polished specimen (no. 389) was separated from this exposure in 

 the lower right-hand corner of the view at .1. 



391. Polished specimen of gneiss ; from near Searles quarry, Great Barrington, 



Mass. Showing crumpled quartz lenses across lamination and foliation. 

 One-half natural size. 



Photographed and Presented by S. R. Stoddard, Photographer, Glens Falls, X. Y. 



Nos. 392 to 414, size 7x9 inches, price post-paid I 50 cents each ; nos. 414 to 4-34, 

 size 5x8 inches, price post-paid) 30 cents each. (Mr. Stoddard's numbers are 

 given in parentheses for the convenience of those who may wish to order views, i 



392 (66). Clear lake : from mount Jo, Adirondacks. The forest cover of our north- 



ern mountains is beautifully illustrated in this view. The next photograph 

 1393) illustrates the devastation produced by forest-clearing (W. M. D.). 



393 (494). The trail of the charcoal-burner ; Adirondacks. 



394(486). Lower Ausable lake: Adirondacks. An excellent illustration of a pre- 

 glacial valley obstructed by a drift barrier and thus forming a linear lake 

 W. M. D.). 



395 (489). Upper Ausable lake: Haystack mountain; from inlet. 



396(488). ■' " - "The Gothics;" from inlet. 



397 (13). Ausable chasm: Column rocks; a post-glacial gorge cut in Potsdam sand- 

 stone. This is a good type of the many •j.f.r^r?. of New York, all of which 

 may be classed as the product of streams turned across old rocky slopes by 

 drift barriers which now occupy the former valleys (W. M. D.). 



:!!)<S. Ausable chasm : Rainbow fall.-. 



399(19). " " Grand flume ; from rapids down. 



ton (17,. •• •• View upward from Table rock. 



401 (492). The White mountains and the Ammonoosuc river. 



402 (131). West Point; looking northward from the plain. 



403 (60). Charcoal kilns on the Chateaugay railroad. 



