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NEW YORK STATE MUSEUM 



New Scotland beds as rock shelters, owing to rapid disintegration 

 of the underlying beds at the contact line [see pi. 12]. The 

 heavy beds of rock are traversed by joint cracks, which by solu- 

 tion frequently become widened into fissures of considerable 

 extent. 



Exposures are numerous in the Schoharie valley but less fre- 

 quent and accessible in that of the Cobleskill. On both West and 

 East hills and on Dann's hill good cliffs of this rock extend for 

 miles above the New Scotland slope. One of the best exposures 

 is in front of the home of Mr George Acker on West hill, where a 

 cliff of 15| feet of the limestone may be seen extending for some 

 distance just below the road. Above this are 5|- feet of similar 

 rock, after which the limestones become somewhat finer grained, 

 darker and more compact, with fewer organic remains. These 

 upper beds with a thickness of 10-15 feet may represent a part 

 of the Port Ewen or Upper Shaly bed series, which is otherwise 

 unrepresented in this vicinity. At any rate they are lithically 

 identical with beds occupying a similar position at Becraft moun- 

 tain and which there represent the Tort Ewen beds. 



Including these beds with the Becraft, from which they scarcely 

 differ lithically, we have about 30 feet of strata between the New 

 Scotland and the Oriskany. At Countryman hill near New Salem 

 the Becraft has a thickness of only 17 feet and is at once suc- 

 ceeded by 2 feet of Oriskany. At Clarksville, a mile farther 

 south, it is 20 feet thick and is succeeded by 1 foot of Oriskany. 

 At Becraft mountain, where the thickness of the Becrafl is 45 

 feet, there are from 20 to 25 feet of Pori Ewen between it and 

 the Oriskany. the transition being apparently a gradual one. 

 At Rondoul on 1 he other hand, where the Becraft has a thickness of 

 aboul 35 feet, it is succeeded by 110 feet or more of Port Ewen or 

 Upper Shaly beds. The great thickness of the Port Ewen beds 

 here is mainly due to a difference in the material of which it is 

 made, this being in a large measure argillaceous and silicious 

 elastics, whereas at Becrafl mountain it is mainly a deposit of 

 lime sandrocks. 



