VANCEBOEO SYSTEM. 



71 



plain at First Eel Lake, the river Avoiild naturally have flowed farther south 

 or southeast. If so, the Eel River osar may prove to be a continuation of 

 one of the osars that unite at Vanceboro. 



A short distance north of the railroad bridge at Vanceboro is a small 

 and rather level-topped plain of sand and fine gravel which extends west- 

 ward from the main osar ridge. It ends in a steep bank, and is quite regu- 

 larly stratified, the strata dipping outward. The material is somewhat 

 coarser near the main ridge than at the edges, and therefore the deposit 

 presents the external appearance of a small delta ending in sand, showing 

 that the currents were not wholly checked. 



Just south of this plain the St. Croix River bends to the westward and 

 crosses the line of the osar. There is a short gap in the ridge at this 23oint, 

 perhaps due in part to erosion by the river. A ridge begins a few rods 

 south of the railroad sta- 

 tion (near where the two ■^t.^^ 

 glacial rivers united), and 

 thence a well-defined ridge 

 or series of ridges is formed 

 along the St. Croix for 

 about 5 miles, it being 

 most of the way on the 

 west side of the river. At 

 the mouth of Trout Brook the river makes an abrupt bend westward, 

 and the course of the gravel system is uncertain. Large sand-and-gravel 

 plains are reported by Prof. Gr. F. Mathew,^ near Lynnfield, Charlotte 

 County, New Brunswick. I did not personally explore the valley of the 

 St. Croix for several miles south of Vanceboro, and my marking of the 

 probable course of this glacial river as extending from the mouth of Trout 

 Brook southeastward past Mud Lake to Lynnfield, where it would naturally 

 deposit delta-plains, is provisional. The Lynnfield plains appear to be con- 

 siderably above the contour of 225 feet, and this glacial river may have 

 deposited gravels south or southeast of them, perhaps down the valley of 

 the Digdequash River. 



Fio. 9.— Osar and rtelta-plai 



\s, lakelet, Vanceboro 



' Report on the superficial geology of southern New Brunswick : Geological Survey of Canada, 

 Report of Progress for 1877-78, pp. 13-14 eb, Montreal, 1879. 



