STATE OF NORTH DAKOTA 119

in the publications of the Minnesota Geological Survey.^ More de-
tailed work both in Minnesota and North Dakota was undertaken
later by the same geologist and the report on it was published by
the United States Geological Survey.* By the cooperation of the
geological surveys of the United States and Canada, Warren Up-
ham was enabled to complete his investigations on Glacial Lake
Agfassiz, which were published by the United States Geological
Survey and in part by the Geological and Natural History Survey
of Canada.' The report is a valuable contribution to science.
Altitudes in the lake area have also been included in another pub-
lication by the United States Geological Survey.*

Important observations of the beaches of Lake Agassiz farther
northward along the Manitoba escarpment and near the mouth
of the Saskatchewan have been made during work for the Geolog-
ical Survey of Canada by Mr. J. B. Tyrrell."

The Geological and Natural History Survey of Minnesota in
Vol. 4 of its Final Report, 1899, considers the areal geology of
Kitson, Roseau and Marshall counties, lying in the Red River Val-
ley, and these have many characteristics in common with Pembina
and Walsh counties in North Dakota. Dr. C. P. Berkey, did some
work in the vicinity of Walhalla and published the results in the
Am. Geologist, Vol. XXXV, No. 3, March, 1905. Work of a gen-
eral character has been carried on in the past in this area by Prof.
Babcock and Dr. Leonard of the North Dakota Geological Survey,
and is reported in the First and Third Biennial Reports.
Acknowledgments are due Mr. J. M. Melsted, of Gardar, and Dr.
