SEBOOIS-KINGMAE^-OOLUMBIA SYSTEM. 95 



to Machias Fourth Lake. From this point southward I have followed in 

 great part the information given by H. R. Taylor, C. E., of Machias, and 

 the late Hon. S. F. Perley, of Naples. As mapped, the system runs near 

 the town lines east of Sabao Lake and the large Mopang Lake, and 

 appears to end near Pleasant River Lake. I crossed this system on the 

 Air Line road in 1878, bitt could not at that time distinguish the plains as 

 a delta. My information concerning the Pleasant River Valley south of 

 the lake of that name is meager and conflicting. As seen from Columbia, 

 the valley appears to have a gentle slope and to be covered with marine 

 clay for a long distance northward. It seems probable, therefore, that the 

 plains near Pleasant River Lake end at the south in a marine delta — 

 at least that would account for the system's ending so far from the sea. 



As to the region between Sisladobsis and Nickatous lakes, I have 

 received miich information from Messrs. James Belmore and S. W. Hay- 

 cock, of Calais; also from D. F. Maxwell, C. E., of St. Stephen, New 

 Brunswick; A. J. Darhng, of Enfield; John Gardner, of Robbinston, and 

 many others. All agree that in that region there are large tracts of sand 

 and gravel overgrown with "Norway pine." These are probably glacial 

 gravels, but my informants locate them with reference to streams and lakes 

 not on the existing maps, and therefore it is impossible for me to map them 

 eA^en approximately. 



Within 30 miles from Machias are perhaps the most noted grounds for 

 the hunting of deer to be found in the older portion of the United States. 

 The "Raceground" is so called because favorable to the chase. These 

 great plains are due to the large glacial rivers which poured into the sea, at 

 a time when the Machias Valley as far north as the Air Line road was 

 covered by a broad sheet of salt water. 



SEBOOIS-KINGMAN-COLUMBIA SYSTEM. 



A short ridge of glacial gravel is found in Oxbow Township, Aroos- 

 took County, and several similar ridges are reported along the upper 

 Seboois Lakes. It is as yet uncertain whether they have any connection 

 with the remarkable system now to be described. An osar of luiknown 

 length comes southward out of the woods to the north shore of Seboois 

 Second Lake in T. 7, R. 7, Penobscot County. It enters the water on 

 the north side of the lake and reap^Dears on the south shore, and thence 



