20 STRATIGR.\PHICAL GEOLOGY. 



Matthew, and Hartt. Their most recent conckisions present the follow- 

 ing arrangement : first, the Bloomsbury conglomerate, 500 feet thick ; 

 second, the Dadoxylon sandstone, 2800 feet thick; third, the Cordaite 

 shales and flags, 2400 feet thick; fourth, the Mispec conglomerate, 1800 

 feet thick — total, 7500 feet. In the western part of New Brunswick, and 

 at Perry, Me., are limited patches of red sandstones belonging to the 

 Upper Devonian, and closely related to the Gaspe and St. John series. 

 Dr. Dawson has described nearly a hundred species of plants from these 

 Devonian sandstones. 



Carboniferous. The Carboniferous rocks are essentially in two basins, 

 the one in Massachusetts and Rhode Island, the other occupying portions 

 of New Brunswick, Prince Edwards island, Nova Scotia, Cape Breton, 

 and Newfoundland, the greater portion of it underlying the Gulf of St, 

 Lawrence. The coal of the first basin is anthracite, and the second is 

 bituminous. According to my own explorations,* the Rhode Island sys- 

 tem consists of 



First, coarse conglomerate, with distorted pebbles, . . . 300 feet. 



Schists and slates, 473 " 



Second, conglomerate, ......... 464 " 



Coal measures, 3500 " 



Third, conglomerate, 50 " 



Total, 4787 feet. 



There are eleven beds of anthracite in these measures at the north end 

 of the island of Aquidneck. 



The Carboniferous outcrops along the Bay of Chaleur consist of con- 

 glomerates and sandstones, called the Bonaventure formation by Logan, 

 3000 feet thick. The extensive field in New Brunswick consists of com- 

 paratively thin deposits spread over a large surface, and contains very 

 little coal. The coal measures and millstone grit combined are 600 feet 

 thick, according to Bailey and Matthew. In Nova Scotia is exhibited 

 one of the most remarkable sections in the Carboniferous of any part of 

 North America. Dr. Dawson arranges the whole Carboniferous series 

 as follows: 



(i) The lower coal measures. 



* Proc. Avier. Ass. Adv. Sci., vol. 14, p. 112. 



