ELIZABETHTOWN AND PORT HENRY QUADRANGLES 65 



dam beds, are here not as fully developed as in Clinton county 

 and that the formation as a whole does not attain the great thick- 

 ness it has farther north. 



Beekmantown formation. The Beekmantown formation has 

 been found during this investigation to be well exposed along the 

 shore from Cold Spring bay to Cole bay, in the Westport area. 

 The section begins with the division A of the Beekmantown at 

 Cold Spring bay, south of Westport, the transition beds to the 

 Potsdam farther north being hidden from view by drift. Owing 

 to the west to south dip of the beds the other divisions are suc- 

 cessively brought up in the shore cliffs and their characteristics 

 can be studied in detail. Care must, however, be taken since low 

 anticlines and faults have caused repetition of beds and the dis- 

 appearance of portions of the section, especially in D which there- 

 fore is incompletely exposed. 



The greater part of divisions A and B is probably covered, but 

 division C which occupies the lake shore from the promontory 

 east of Cold Spring bay past Barber point to the point east of Cole 

 island is splendidly exposed in all its subdivisions ; the only im- 

 portant disturbance appearing at Young bay where probably a 

 minor fault passes out and south of Barber point where a low 

 anticline causes a repetition of the beds. Of especial interest are 

 beds of coarse breccias in C^, containing angular blocks of the 

 preceding divisions, some 2 feet in diameter. These brecciated 

 beds are repeated several times. Cg which is exposed at Barber 

 point, is a sandstone much resembling the Potsdam sandstone and 

 covered on the surface with great numbers of spirally curved worm 

 casts. Below the light-house C4, the magnesian limestone no. 2 

 is exposed. This also is brecciated and is followed again by the 

 worm tube marked sandstones of Cg which extend for half a mile 

 south of Barber point and are followed by the magnesian lime- 

 stones of C4 which here, as in the Shoreham section of Vermont, 



^We have here adopted the subdivision of the Beekmantown (Calciferous) 

 formation in five members (A, B, C, D and E), first proposed by Brainerd 

 and Seely [Am. Mus. Nat. Hist. Bill. 3:1, p. 2-3; see also Gushing. N. Y. 

 State Mus. Bui. 95, p. 361]. Division A consists in Brainerd and Seely's type 

 section at Shoreham in Vermont of 310 feet of dark iron-gray magnesian 

 limestone, that in some beds approaches a sandstone; division B of 295 feet 

 of dove-colored limestone ; division C (350 feet) of magnesian limestone and 

 sandstone; division D (375 feet) of blue and drab limestone and sandy lime- 

 stone; and division E (470 feet) of fine grained magnesian limestone with 

 thin layers of slate near the top. 



