420 N. H. DARTON — CATALOG OF PHOTOGRAPHS 



Photographed by N. H. Barton 



6| by 82 inches. Negatives in United States Geological Survey 



Nos. 818-828, 830-834, 836, 838, 840-842, 845-850, 852-856 are published in Report 

 of State Geologist of New York for 1893 



817. Calciferous sandrock on East Canada creek, two miles above its mouth, Herki- 



mer county, New York (No. 133). 



818. Calciferous on East Canada creek, one mile above its mouth (No. 134). 



819. Fault and dike in east bank of East Canada creek, a mile above its mouth 



(No. 131). 



820. Fault and dike in east bank of East Canada creek, 1 mile above its mouth, 



looking east. On the left is Calciferous, with a breccia along the fault 

 plane. In the center is the dike, which is a melilite-diabase. On the 

 right are Trenton limestones below and shales and thin sandstones of the 

 Utica formation above. The central opening is an adit made by pros- 

 pectors (No. 132). 



821. Ravine in Utica shales behind Canajoharie, New York (No. 143). 



822. Gorge of Mohawk river, at Little Falls, New York. Calciferous in the fore- 



ground and to the left. Crystalline rocks along the river to the left and 

 hills of Utica shale in the background. Looking west (No. 136). 



823. The principal falls of Trenton Falls, New York, over Trenton limestone (JNo. 



137). 



824. Cascade in upper gorge at Trenton Falls, over Trenton limestone (No. 146). 



825. Potsdam sandstone lying on crystalline rocks, just below Jessups landing, on 



Hudson river, Saratoga county, New York. Shows thin bedded sandstones 

 and basal conglomerates and many points of actual contact with the crys- 

 talline rocks (No. 116). 



826. Potsdam conglomerate on crystalline rocks near Mosherville, Saratoga county , 



New York (No. 118). 



827. Glaciated surface of Potsdam conglomerate near Mosherville (No. 117). 



828. Glens falls, on Hudson river. Looking west (No. 120). 



829. Quarry in Trenton limestone, south bank of Hudson river, Glens Falls, New 



York (No. 121). 



830. Calciferous on crystalline schists, West Shore railroad cut one mile west of 



Downing station, New York. Looking south (No. 128). 



831. Lower portion of gorge at Trenton Falls, New York (No. Ml). 



832. Spencer falls, Trenton Falls, New York, over Trenton limestone (No. 140). 



833. Quarry at Howes cave, Schoharie county, New York. Pentamerus and ten- 



taculite beds of the Helderberg limestone (No. 148). 



834. Pentamerus and tentaculite beds of Helderberg limestone at Indian Ladder, 



Albany county, New York (No. 157). 



835. The Helderberg escarpment at Indian Ladder, Albany county, New York. 



Slopes of Hudson shale, cliffs of tentaculite, and pentamerus limestones; 

 looking south (No. 154). 



836. Part of panorama to the westward of 835, showing the ''gulf" at Indian 



Ladder (No. 155). 



