Environmental Engineering Reference
In-Depth Information
CANADA
105
110
°
100
°
°
1-5
1-4
3
1-5
4
2
MONTANA
NORTH DAKOTA
FORT UNION GP. - TERTIARY
2
PIERRE FM.
3
5
BEARPAW FM.
JUDITH RIVER FM.
CLAGGETT FM.
COLORADO GP.
CRETACEOUS
4
SOUTH DAKOTA
FIGURE 6.87
Distribution of Tertiary and Cretaceous marine shales in the northwestern United States. (From Banks, D. C.,
Proceedings ASCE, 13th Symposium on Rock Mechanics, University of Illinois, 1971, pp. 302-328, 1972. With
permission.)
FIGURE 6.88
Highly disintegrated marine shales of the Permian, Mineiros, Goias, Brazil.
