GEOLOGY OF SARATOGA SPRINGS AND VICINITY 4I 



FEET INCHES 



32 Dark blue, subcrystalline, magnesian limestone. ... i 3 



31 Blackish, oolitic dolomite i 8 



30 Dark blue, crystalline dolomite, calcite cement 

 which shows large cleavage faces ; holds Lingu- 



lepis acuminata 10 



29 Black, oolitic dolomite containing pebbles of mud 



limestone i 8 



28 Rotten, crystalline dolomite, calcite cement rapidly 



leaching out 5 



27 Blackish, oolitic dolomite in three beds, the upper 

 a Cryptozoon bed ; frequent sand grains and 

 many drusy cavities with quartz ^nd calcite 



crystals 2 6 



26 Easily rotting crystalline dolomite, calcite cement, 



very shaly above 9 



25 Hard, light r.olored, vitreous sandstone i 4 



24 Crystalline bluish dolomite, calcite cement i 7 



23 Two massive beds of blackish, subcrystalline mag- 

 nesian limestone, with frequent sand grains 4 3 



22 Concealed between the two railroad cuts ; boundary 

 between Hoyt limestone and Theresa formation 

 in the interval 20 .... 



94 



Several points brought out by this section need to be noted. 

 Vitreous sandstones run up in it for nearly 60 feet above the base, 

 and there may be some question in regard to the classification of 

 this portion of the section. The sandstones are not so numerous 

 as in corresponding portions of the Theresa section elsewhere; the 

 black oolitic and magnesian limestone beds are quite characteristic 

 of the Hoyt, and not so much so of the normal Theresa. The sec- 

 tion brings out clearly the fact that the Hoyt lies above the Theresa 

 passage beds and is followed by the Little Falls and that the same 

 interval elsewhere is occupied by a thickness of passage beds equal 

 to the combined thickness of the Hoyt and Theresa of the Sara- 

 toga section. In other words, the Hoyt is a local phase of the upper 

 Theresa, probably a more offshore phase. It is exposed only at 

 Saratoga because only here has erosion cut down to this phase 

 Elsewhere the near shore phase of the formation is exposed and 



