GEOLOGY OF SARATOGA SPRINGS AXD VICIXITY 37 



FEET INCHES 



12 Light colored, vitreous sandstone i 3 



1 1 Gray, banded sandstone, slightly calcareous 3 9 



10 Alternating calcareous sandstone and crystalline 

 dolomite of blue gray color, large nodules of 



crystalline calcite in the latter; base of cut 3 .... 



9 Concealed between this and next cut east; arbi- 

 trary boundary between Theresa and Potsdam 



in the interval ; about 30 .... 



8 Hard, vitreous, light colored sandstone with 



darker calcareous sandstone above and below. . i 8 



7 Concealed to brook exposures next east ; about . . . 30- .... 

 6 Light colored, vitreous sandstone, with alternat- 

 ing layers of darker, calcareous sandstone which 



weather rapidly 30 



5 Light colored, vitreous sandstone 15 



4 Concealed 4 



3 Light colored, vitreous sandstone 2 



2 Concealed 4 



I Conglomerate, increasing in coarseness downward 



and reaching nearly to base of formation 10 .... 



Numbers i to 8 are regarded as constituting the Potsdam though 

 there is some question about the classification of 7 and 8, which 

 may be Theresa. If they are regarded as Potsdam, that formation 

 has a thickness of 96 feet, 8 inches in the section, with the base 

 not reached, though it can not be more than a few feet away. 

 Above is a thickness of 52 feet of beds which are certainly to be 

 classed as Theresa, and occasional beds of sandstone run still 

 higher. 



The State road out of Saratoga toward Corinth crosses the 

 Adirondack Railroad in a low depression between two rock cuts. 

 The easterly one of these is the one in which the upper part of the 

 above section was measured, nos. 10 to 21. It is the most ac- 

 cessible locality within the district about Saratoga where the 

 Theresa formation is well shown. A photograph of the rock wall 

 of the cut is shown in plate i, the extended hand resting on the 

 fossiliferous layer, no. 15 of the section. From this we obtained 

 species of Ptychoparia and Agraulos which are specifically 

 different from the forms found in the Hoyt limestone above. The 

 species collected here were, in addition to L i n g u 1 e 11 a 



