204 BULLETIN OF THE NATURAL HISTORY SOCIETY.' •' 
followed in general upon the accompanying small-scaled map, but 
they will be much plainer if read in comparison with the maps of 
the Geological Survey, which show also the courses of the for- 
mations. 
1. The Machian Valley . — To the westward of the New Bruns- 
wick series lie lines of valleys strongly suggestive of a continua- 
tion of the svstem. The westernmost of these heads in the East 
Branch of Penobscot (outside the limits of the rccompanying 
map, but very plain on Wilkinson’s map), follows the Penobscot a 
short distance to the re-entrant Matakeunk, which it follows 
through the westernmost Scoodic lakes to the Machias. 
Possibly another occurs east of this, heading in the Molum- 
kaus, crossing through Matagoodus, Scoodic Lakes and East 
Alachias. 
2. The Scoodian Valley . — This is the least distinct of the val- 
leys of the region, but it appears to be traceable from the Baska- 
hegan along the streams to the Grand Ealls of St. Croix, thence 
following the present river (the ancient Scoodic) to near Meddy-, 
bemps Lake, whence it probably runs through the Penamaquaiii, 
Valley into Cobscook. But my evidence as to this valley is almost 
wholly cartographical, and I can offer little more than a sugges 
tion. A minor valley seems to be east of this, including Mohannes 
Stream, Magurrewock and Boyden’s Lakes. 
3. The Chepednian Valley . — This appears to head in Mata- 
wamkeag River, or Skitticook Branch, (if not farther north in 
Aroostook waters), and extending through Grand Lake and its, 
Great South Bay, Lambert Lake, Scott’s Brook, the Chiputneti- 
cook ( St. Croix ) to Canoose, runs thence across to Denys River, 
and by this to the St. Croix below St. Stephen, which it follows 
to near the Narrows, when it passes behind the Devil’s Head to 
reacli the lower St. Croix near Red Beach. 
4. The Passaniaquodicin Valley . — This valley appears to head 
in the south branch of iMeduxnekeag (and perhaps farther north), 
extends thence to Lower iMonument Brook, thence across the head 
of Pirate Brook to IMusquash Brook, thence directly through to 
the St. Croix, which it leaves at Mud Lake, whence it extends 
across the heads of Canoose and Denys streams. Gallop Stream, 
and thus into Oak Bay and the Lower St. Croix (both of which it 
formed) ; it continues through Passamaquoddy near the Maine 
sliOre, passes between Deer Island and Moose Island, and crosses 
Campobello to empty through Herring Cove. A large river hav- 
ing this general course explains perfectly the Origin of the 
remarkable Oak Bay-St. Croix estuary, which otherwise stands, 
much in need of interpretation. 
