WILLIAMS.] HITCHCOCK, BAILEY AND MATTHEW. 243 



them as pre Carboniferous, but found no direct evidence of their age. 

 He identified them as occupying the same place in the series with simi- 

 lar rocks reported on the west side of East River by Mr. Hartley. 



The second series, which he identified with the " Millstone grit" of 

 Dawson's Acadian Geology, and with "Bonaventure formation * of 

 Gasp6, and the "Millstone grit" of England, occurs on the east side of 

 East River in a triangular area, and near the foot of Fraser's Moun- 

 tain. Thin, impure limestones, carrying fossils 3 among them iSpirorbis 

 carbonarius, were noted at McLellan's Brook. For this formation he 

 proposed the name " Grindstone grit." 



The third series, named by Dawson the u New Glasgow Conglomer- 

 ate," has a total thickness of 1,600 feet. It covers the south flank of 

 Fraser's Mountain. In a white arenaceous limestone, 3 miles eastward 

 of New Glasgow, occurring in the midst of a series of sandstones, 

 shales, and other concretionary limestones, was discovered a number 

 of minute coiled shells, referred to a new species of iSpirorbis, and de- 

 scribed by Dawson under the name of Spirorbis arietina. 



The fourth series, the u Productive Coal Measures," is well repre- 

 sented by a section along McLellan's Brook, between McLellan's and 

 McGregor's Mountains, but the upper part of the series is not shown in 

 this section. 



In 1871 Prof. Hitchcock * aunounced the discovery of Helderberg corals 

 in Littleton, New Hampshire. The limestone containing the corals was 

 traced for about 3 miles, and appeared to be duplicated by a synclinal 

 fold. It overlies the metamorphic Quebec group on one side, and 

 probably the Coos group on the other, and appears to be overlaid by a 

 clay slate carrying a few worm trails. The corals were obscure, and 

 were submitted to the examination of E. Billings, of Montreal. He 

 recognized Favosites basilica and a Zaphrentis. The rock appeared to be 

 identical with the Canadian limestone 55 miles to the northwest, sup- 

 posed to range from the Lower to the Upper Helderberg. 



Messrs. Bailey and Matthew, in 1872, 2 presented their preliminary 

 report on the geology of southern New Brunswick. In this article the 

 Devonian rocks of St. John County, New Brunswick, are described 

 under the following classification : 



Bloomsoury conglomerate. — Coarse reddish gray rock, red shales interstratified ; 

 thickness 500 feet. 



Dadoxylon sandstone.— Sandstone and grits, with dark green shales; 2,800 feet; 

 containing fossils, plants, Crustacea, and wings of insects. 



Cordaites shales and flags.— Two thousand four hundred feet, containing numerous 

 plant remains. 



Mispec conglomerate. — One thousand eight hundred feet. 



The Devonian rocks of Lepreau Harbor are separated from those of 



1 Hitchcock, C. H.: Helderberg Corals in New Hampshire. Am. Jour. Sci., 3d series, vol. 2, 1871, pp. 

 148, 149. 



•Bailey, L. W., and Matthew, G. F.: Preliminary report on the geology of southern New Brunswick. 

 Geol. Survey Canada : Report of progress for 1870-71, 1872, pp. 13-240. 



