GEOLOGY OF THE NORTHERN ADIRONDACK REGION 381 



were drilled deeper, and from their records Orton constructed a 

 generalized section for the vicinity, which allots a thickness of 

 600 feet to the formation (inclusive of the Black river and Low- 

 ville), and 200 feet to the Beekmantown beneath. 1 At Stillwater, 

 10 miles southeast of Pulaski, he indicates a thickness of 670 feet 

 for the Trenton, and no allowance is made for the Beekmantown, 

 which is surprising and suggests the query whether the Trenton 

 has not been thickened at its expense. Here also the upper 300 

 feet are significantly' referred to as " White Trenton " and the 

 lower portion as " Dark Trenton," an arrangement of interest 

 when compared with the type section. 



A few wells are also reported on in Jefferson county, but the 

 records given are very fragmentary. 2 In Adams township, next 

 southeast of Watertown, three wells were drilled to the Precam- 

 bric, which was reached at from 915 to 960 feet. Except for a 

 few feet of drift the wells began in the Trenton and very near 

 its summit. It seems incredible that the formation should be 

 900 feet thick here, but this includes the Black River and Low- 

 ville, and, in all probability, at least a small thickness of the 

 Beekmantown, though it is not certain that that formation is here 

 present. It is found however in outcrop not many miles away to 

 the northeast, though it is not thick. However this may be, and 

 making the most generous allowance possible, there yet remains 

 a huge thickness which must be ascribed to the Trenton proper. 



Notwithstanding their imperfections, these sections indicate 

 with clearness that the thickness of the formation at Trenton falls 

 is not a mere local matter, but that it is held, and much increased 

 to the north, on the west side of the Adirondack region. As the 

 same records show, the overlying Utica rapidly thins in the same 

 direction. 



In the Mohawk valley, west from Herkimer, the drill has also 

 given corroborative evidence. 3 In the well at Ilion, only 3 miles 

 west of Herkimer, the section shows 105 feet of Trenton, about 

 what should be expected from its measured thickness along West 

 Canada creek between Herkimer and Middleville. At Utica. 12 

 miles farther to the north of west, the Trenton is certainly 330 



*Op. ext. p.442. 

 2 Op. ext. p.456-59. 



3 Prosser, C. S. Am. Geol. 25:131-49; Geol. Soc. Am. Bui. 4 :100. 



