Blaney and Loomis — Mt. Desert Island. . 401 



Labrador to-day were both preserved as fossil faunas, the temp- 

 tation would be very strong to identify them as of the same 

 age, which indicates some of the difficulties in the way of syn- 

 chronizing two extinct faunas, when the time element separat- 

 ing thein is not very great. In this case the constant element 

 has been temperature. 



The clays at Goose Cove, Mt. Desert Island, would usually 

 be designated as Leda Clays, but it should also be noted that 

 they contain Saxicava, which in Canada belong to a later phase. 

 The mingling of Leda faunas and Saxicava faunas is character- 

 istic of the deposits in Maine. 



In general the Goose Cove fauna resembles most closely the 

 fauna found in New Brunswick and described by Matthew. 

 It is also very similar to the fauna found at Portland, Me., but 

 differs from both of these in many fundamental respects, 

 From the collections made at Saco, Me., and at Gardiner, Me., 

 the Goose Cove fauna differs even more widely, though it 

 would be expected to resemble them more closely. The pres- 

 ence of Modiolus modiolus in abundance, of Trickotropis, of 

 the Ledas, and Astartes, of Rhynchonella psitticea and Tere- 

 hratella make a surprising close affinity to the fauna found at 

 Montreal where these forms are distinctive, and occur in about 

 the same relative abundance as at Goose Cove. 



For the most important literature see the following, which 

 contain all the minor references : 



Dawson, J. W., Canadian Ice Age, 1894. 



Packard, A. S., Glacial Phenomena of Labrador and Maine, 

 Memoirs Boston Soc. Nat. Hist., vol. 1, pp. 210-303, 1865. 



Stone, G. H., The Glacial Gravels of Maine, U. S. Geol. Sur- 

 vey, Monograph 34, 1899. 



Amherst, Mass. 



