NEW YORK 421 



837. The Helderberg escarpment south of Indian Ladder, Albany county, New 



York ; looking southwest. Slopes of Hudson shale in the foreground. 

 High cliffs of pentamerus beds of the Helderberg, surmounted by terraces 

 of overlying limestones. Hills of Hamilton group in the background to 

 the right (No. 156). 



838. Quarry in Helderberg limestones just south of South Bethlehem, Albany 



county, New York. Exhibits tentaculite and pentamerus beds, used for 

 road metal; looking south (No. 158). 



839. Road metal quarry in pentamerus and tentaculite beds of Helderberg lime- 



stones at South Bethlehem (No. 159). 



840. Creek falling into limestone cave (pentamerus beds of Helderberg limestone), 



west of Coxsackie, New York (No. 161). 



841. Overturn and fault of Sprayt creek, one mile west of South Bethlehem, Al- 



bany county, New York. To the left are the Hudson shales, exhibiting 

 an overturned anticlinal with nearly horizontal axis. They are overlain 

 by thin-bedded Helderberg limestones, and at the top are heavier bedded 

 limestones, which are overthrust along a fault plane which is seen in the 

 middle of the right-hand side of the photograph (No. 162). 



842. Anticlinal in Esopus shales (Cauda galli), Catskill creek, near Leeds, Green 



county, New York (No. 168). 



843. Northern front of Catskills, and Cairo knob, from near Leeds. Catskill 



creek in the fore and middle ground (No. 186). 



844. Wittemburg range, southern Catskills, from half a mile east of Shokan sta- 



tion ; looking west (No. 185). 



845. Esopus shales, on west bank of Esopus creek, two miles above Saugerties, 



New York. Ledges of Oriskany sandstone are seen along the east bank 

 (No. 167). 



846. Champlain clay lying against Helderberg limestones, west shore of Hudson 



river, near Rondout, New York ; looking north (No. 169). 



847. Quarry in Becraft limestone, Rondout, New York; looking north (No. 175). 



848. Cement beds and limestones on Wallkill Valley railroad, one mile south of 



Whiteport, New York (No. 177). 



849. Arch in Salina and Clinton beds at High Falls, Ulster county, New York; 



looking north (No. 182). 



850. High Falls, Ulster county, New York. Over cement beds of the Salina for- 



mation ; looking north (No. 180). 



851. Clinton and Salina formations in west bank of Rondout creek at High 



Falls, Ulster county, New York (No. 181). 



852. Looking southward across lake Mohonk, Ulster county, New York. This 



lake is surrounded by cliffs of Shawangunk grit. Published in National 

 Geographic Magazine, volume vi, plate 2 (No. 190). 



853. Eastern face of Shawangunk mountain, two miles south of lake Mohonk, 



Ulster county, New York. Shawangunk grit lying on Hudson shales. 

 Published in National Geographic Magazine, volume vi, plate 3 (No. 196). 



854. Cliffs of Shawangunk grit on west shore of lake Mohonk, Ulster county, 



New York (No. 189). 



855. Awosting falls, on the Peterkill, near lake Minnewaska, Ulster county, New 



York. Over Shawangunk grit (No. 192). 



856. Honk falls, over flaggy beds of Devonian age, near Napanoch, Ulster county, 



New York; looking north (No. 188). 

 LXI— Bui,l. Geoi,. Soc. Am., Vol. 13, 1901 



