352 H. S. WILLIAMS PALEOZOIC FAUNAS OF EASTPORT QUADRANGLE 



cut by numerous dikes and interbedded masses. Volcanic flows and asli 

 beds constantly interrupt the sequence of the stratified and fossil-bearing 

 sediments; but structurally, as well as faunally, the whole series is 

 divisible into four distinct masses, namely : 



1. A mass of slates and metamorphosed sandstones occupying in general 

 the south corner of the area is separated from the rest of the series by a 

 profound fault, which runs from a few miles south of the town of Whit- 

 ing to Johnson Bay, north of Lubec. This fault has been traced across 

 the boundary into southwestern Xew Brunswick. Faunally this mass 

 contains the oldest fauna of the series. 



2. The area on the west side of the quadrangle, including parts of the 

 towns of Edmund and Dennysville, is covered by a mass of sediments 

 and igneous rocks which do not appear to have suffered metamorphism. 

 The mass is separated, however, by fault planes and probably by uncon- 

 formity from the next higher mass. 



3. The main interior mass of the quadrangle, the sedimentary beds of 

 which contain a series of fossil faunas, ranging from purely marine 

 below to estuarine beds at the top, is separated from the fourth mass by 

 a distinct unconformity, as is shown by the sections in the region of the 

 reservoir west of Perry village, where the uppermost beds of the Silurian 

 rocks containing fossils are followed by the Perry sediments lying uncon- 

 formably on them. 



4. The Perry group occupies the northeast corner of the quadrangle, 

 and is shown by its plant remains to be at least as young as Devonian. 

 It lies unconformably on the series below. 



Faunal Characteristics of the Sedimentts 



Faunally the series is divisible into six fairly well defined geological 

 formations. 



Formations I and II (represented by the structural masses above de- 

 scribed as 1 and 2) contain few diminutive fossils. Plectambonites 

 transversaJis (Waliln.) is found in both of them. 



Zone I also contains Monograptus sp. indet., Leptcena rhomhoidalis 

 (Wilckens), Atrypa reticuJaris (Linne), and Spirifers of the Sp. crispus^ 

 and Sp. radiatus types. 



Zone II is known only by a single fauna in a soft mud-shale. It is 

 distinguished by the presence of Piccfaiubonites transversaJis (Wahln.), 



