1 8 THE JOURNAL OF GEOLOGY. 



daloids, aphanites, etc.) occur around the head of the Bay of 

 Chaleur and Dalhousie, as well as on the upper Upsalquitch and 

 Elm Tree rivers. Many of these rocks are pre-Cambrian, while 

 others cut the Silurian strata.^ Great sheets of contemporane- 

 ous trap are also found by Ells in the Silurian, and to a very 

 small extent in the Devonian, along the north shore of the Bay 

 of Chaleur. Bailey explored parts of northern and western New 

 Brunswick, especially in Carolton, York and Victoria counties, 

 and found porphyries, felsites and amygdaloids, intrusive in the 

 Silurian and older formations in Canterbury, Woodstock and 

 Kent townships, near the St. Johns river. ^ Still later Bailey 

 and Mclnnes continued similar explorations, and found signs of 

 intense volcanic action in the Niagara limestone at Pointe aux 

 Trembles, and a great development of acid and basic surface 

 rocks near the Aroostook river and at Presqu'ile and Haystack 

 mountain in Maine. 3 The same is true near Tobique lake, 

 farther to the northeast. 



As early as 1839, Gesner describes the volcanic rocks along 

 the Bay of Fundy, in southern New Brunswick, as belonging 

 to several distinct horizons.^ In 1865, Bailey, Matthew and 

 Hartt distinguished two groups mainly of volcanic origin, to one 

 of which, the "Coldbrook," they assigned a Huronian, and to 

 the other, the " Bloomsbury," a Devonian age.^ In 1872, 

 Bailey and Matthew, after a season's field-work with Dr. T. 

 Sterry Hunt, united the Coldbrook and Bloomsbury groups on 

 purely lithological grounds, and for the same reason joined with 

 them two other volcanic series — the Coastal and Kingston 

 groups — exposed at other localities in southern New Bruns- 

 wick.^ The petrographical characters of these rocks were those 

 regarded by Hunt as sufficient demonstration of Huronian age. 

 The acceptance of this fallacious principle exercised a distinctly 



■ lb., 1879-80, pp. 35 to 42. 



2 lb., 2882-83-84, G. pp. 15 and 20; ib., 1885, G. pp. 22 and 28. 



3 lb., 1886, N. pp. 14-15 ; and ib., 1887-88, M. pp. 32 and 47. 



■» First Report on tlie Geological Survey of the Province of New Brunswick, by 

 Abraham Gesner. 87 pp. 1839. 



5 Observations on the Geology of Southern New Brunswick. 1865. 

 ^Report of the Geol. Survey of Canada, 1870-71, pp. 57-133. 



