CEAWPOED SYSTEM. 87 



The map shows that this gravel series is nearly in the direction of the 

 East Machias system prolonged northward. Several small ridges of sub- 

 angular glacial gravel are found intermediate between tlie two systems. 

 They are in T. 18, near the road from Crawford to East Machias. They 

 are found on the western slopes of the rather high hills which border the 

 valley of the East Machias River on the east. Their course is westward 

 down the hills, and I regard them as short hillside kames deposited by 

 small glacial streams which were either lateral tributaries of a large glacial 

 stream in the valley or flowed into the sea at the time it extended far north 

 in the valley of the East Machias River. This valley is very inaccessible, 

 and my exploration was confined to the region lying near the road from 

 East Machias to Crawford. 



According to my present information, it would appear that the glacial 

 and postglacial history of the broad and plain-like valley of the East 

 Machias River is about as follows: 



None of the longer glacial rivers flowed through this valley, the drain- 

 age of the glacier to the north being either carried off eastward by the 

 Denny sville system or westward down the valley of the Machias River. 

 The East Machias system of glacial gravels was wholly deposited before 

 the melting of the ice, unless the enlargement of the system before described 

 as being found about 2 miles from its northern extremity prove to be a 

 marine delta. At the time the ocean stood at the contour of 225 feet, an 

 arm of the sea 3 to 5 miles broad extended northward up this valley to 

 Crawford, and probably was continuous with the bay of salt water which 

 at that time extended up the valleys of the St. Croix and Schoodic rivers 

 to Princeton. The Crawford-Love Lake system was deposited later than 

 the East Machias system, at a time when the ice had receded so far north- 

 ward that all the valley from Round Lake southward was covered by the 

 sea. Occasional gravel deposits have been reported in the valley near the 

 river, but the descriptions make it uncertain whether they are glacial gravel 

 or till. A ridge of true glacial gravel crosses the Air Line road from Calais 

 to Bangor in the southwestern part of Crawford. It is near the East 

 Machias River, and is about a mile long. Another short and rather broad 

 ridge is found not far to the south of it. This series oiight to end at the 

 south in a delta, but I have not been able to find one, unless it be the 

 shorter ridge just mentioned. This short series is evidently an incident in 



