332 /. H. BRADLEY, JR. 



the same conditions and separated from the Tribes Hill by no time 

 break that could have greater than diastemic value. 



The transition beds of Logan's A3 at Philipsburg, made up 

 largely of reddish grey, brown weathering dolomites, succeeded by 

 black massive dolomites, appear quite unfossiliferous. They are 

 clearly represented at East Shoreham by Division C of Brainerd 

 and Seely. In both the localities these beds are characterized by 

 large quantities of wind blown sand and by an absence of fossils. 

 In both localities, dark massive dolomites predominate at the top. 

 Above these massive dolomites in both regions come rocks that 

 carry diagnostic fossils and it is here that the line should be drawn 

 between the Lower and Middle Beekmantown. In this brief 

 discussion of the lower Beekmantown, it has not been the writer's 

 intention to lay down any definite limitations. The present state 

 of knowledge concerning these unfossiliferous and deformed rocks 

 is still too incomplete to warrant a final correlation at this time. It 

 has merely been the intention to point out the possibility of correla- 

 ting the Lower Beekmantown east and west of the great Champlain 

 fault and to suggest the inadvisability of inferring a great uncon- 

 formity between the Philipsburg representatives of the Little 

 Falls dolomite and the Tribes Hill limestone. Until fossils are 

 found directly above and below the contact between Logan's Divi- 

 sion Ai and A2 that prove a considerable break, the pure limestone 

 of A2 must be considered to have been deposited, to be sure under 

 special conditions, but in the same sea without intervening erosion 

 directly subsequent to the formation of the impure dolomites of 

 Division Ai. 



MIDDLE BEEKMANTOWN 



The Middle Beekmantown at East Shoreham, Vermont, in 

 which the writer proposes to include Brainerd and Seely's Divisions 

 Di, D2, D3, D4, and E, rest with apparent structural conformity 

 on the Lower Beekmantown. These Divisions can be correlated 

 with the Middle Beekmantown at Philipsburg which includes 

 Logan's Divisions Bi, 2, 3, 4, and 5, and Ci, on faunal and Ktho- 

 logical grounds. Divisions B5 (upper part) and Ci are not repre- 

 sented at East Shoreham because of post-Beekmantown erosion, 

 which removed all of the uppermost strata of the Middle Beekman- 



