W. Upham—Minnesota Valley in the Ice Age. 39 
corner of Tunsburg by a very notable channel which extends 
eastward from the middle of Lac qui Parle. The latter chan- 
nel, and its continuation in the old Pomme de Terre valley to 
the Chippewa River, are excavated nearly as deep as tue chan- 
nel occupied by the Minnesota River. Its west portion holds a 
marsh generally known as the “Big Slough.” Lac qui Parle 
would have to be raised only a few feet to turn it through this 
deserted valley. The only other localities where we have 
proof that the outflow from Lake Agassiz had more than one 
channel are seven and ten miles below Big Stone Lake, where 
isolated remnants of the general sheet of till occur south of 
Odessa Station and again three miles southeast. Hach of these 
former islands is about a mile long, and rises seventy-five feet 
above the surrounding low land, or nearly as high as the bluffs 
enclosing the valley, which here measures four miles across, 
having a greater width than at any other point 
Terraces and high plains of modified drift, found in many 
places along the valley of the Minnesota River from New Ulm 
to its mouth, show that it was once filled, doubtless at the close 
of the last glacial epoch, with stratified gravel, sand and clay, 
to a depth 75 to 150 feet above the present river. The rem- 
nants of this deposit include the plateau of modified drift, 
about a mile long and an eighth of a mile wide, upon which 
the west and highest part of New U!m is built; a terrace in 
section 27, Courtland, opposite the southeast part of New Ulm, 
more than a mile long and about an eighth of a mile wide; a 
larger terrace, four miles long and a half mile wide, lying also 
im Courtland, four to eight miles southeast from New Im, 
upon which Courtland depot is situated; a terrace extending 
about three miles northwest from near Minneopa falls, and 
varying from a few rods to a third of a mile in width; a ter- 
Tace three miles long east and south of Kasota; the “Sand 
Praine,” about four miles long and averaging a mile wide, west 
and north of Saint Peter ; Le Sueur prairie, six miles long and 
tom one to three miles wide, beginning east of Ottawa and 
teaching to Le Sueur; the plain five miles long and a mile 
wide, near the middle of which Belle Plaine is built; Spirit 
hill and “Sand prairie,” southwest and northwest of Jordan; 
a terrace eight miles long and varying from a few rods to two 
miles in width, extending through San Francisco, Dahlgren 
and Carver; and Shakopee prairie, eight miles long and aver- 
aging one mile wide. The height of these terraces and plains 
at New Ulm is about 115 feet above the river; in Courtland, 
and near Minneopa falls, 125 to 150 feet; at Kasota, Saint — 
Peter and Le Sueur, about 150 feet; at Belle Plaine, about 
185; and at Jordan, Carver and Shakopee, about 125. ells 
on the “Sand prairie” near Saint Peter and on Le Suear prey 
