2£0 THE DEVONIAN AND CARBONIFEROUS. [bull. 80. 



Devonian period, and hence causing irregular deposition and local 

 denudation, a condition very common in Nova Scotia. 



The author has been unable to account for the separation between 

 the lower and middle coal formations, but thinks " it may include much 

 of the i Lower Coal Measures ' of Kogers in the Pennsylvania coal field." 

 He maintains that the order of sequence noted in the Carboniferous 

 period has its parallel in each of the other periods of the Paleozoic 

 age, "each of which was characterized by a great subsidence and partial 

 reelevation, succeeded by a second very gradual subsidence." 



A detail account was given of the stratification of the South Joggins 

 section and discussed under three divisions : 



(1) Logan's section, 1,617 feet in vertical thickness on the shore of 

 Shoulie Eiver. 



(2) Eagged Keef and vicinity, 650 feet in thickness, forming the lower 

 part of the upper coal formation. 



(3) From Eagged Eeef to McCavins Brook, 2,134 feet in thickness, 

 including 1,009 feet of sandstone, 912 feet of shales and clays, and 22 

 coal beds. This is probably equivalent to the " Upper Coal Measures" 

 of American geologists and includes also the " Middle Coal formation." 



In 1867 1 the same author announced some recent discoveries in the 

 Acadian provinces of British America. He said the discovery of aland 

 flora in a series of rocks near St. John, New Brunswick, underlying 

 uuconformably the Lower Carboniferous, has proved the presence of 

 rocks of the Devonian age. For this discovery we are indebted to 

 Messrs. Matthew, Hartt, and Bailey. With the flora were found six 

 species'of insects which have been described by Mr. Scudder. They 

 are the first insects found below the Carboniferous. Below the Devo- 

 nian shales and sandstones occurs a thick series of rocks embracing a 

 fauna of Silurian aspect. This division is termed the "Acadian series." 

 The labors of Mr. Davidson, Mr. Hartt, and the author have brought 

 to light fossils closely allied to Permian species. 



The announcement of the correlation of Devonian rocks in Maine 

 was made by C. H. Hitchcock 2 in 1867. 



A series of slaty deposits in Washington County, Maine, was referred 

 to the "Lower Helderberg" and " Upper Devonian." In the northern 

 part of the State occur the representatives of "(Orislcany) Cauda galli 

 grit" and other fossiliferous zones of Devonian strata. 



A reconnaissance made for the government of New Brunswick 3 by 

 Messrs. Matthew and Bailey, in connection with C. F. Hartt, brought 

 to light a wide distribution of Devonian rocks along the shore of St. 

 John Eiver. After describing the occurrence of the lower metamorphic 



'Dawson, .J. W. : On recent geological discoveries in the Acadian provinces of British America. 

 Am. Assoc. Proc, vol. 16, 1867, pp. 117-119. 



2 Hitchcock, Charles H. : Explanation of a geological map of Maine. In Am. Ass. Proc, vol. 16, 

 1867, pp. 123. 



3 Matthew, George F., and Bailey, L. W. : Remarks on the age and relations of the metamorphio 

 rocks of New Brunswick and Maine. Am. Ass., Proc, vol. 18, 1869, pp. 179-195. 



