UNI CANADA TED STATES - USGS

U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY

112?

111?

110?

109?

CANADA

49?

UNITED STATES

Alberta Saskatchewan

Mosby Sandstone Member present

Havre

Harlem

150 48?

108?

107?

106?

105?

DIGITAL DATA SERIES DDS-57

PLATE 14

104?

M20a0lta

Saco

Glasgow

Montana

North Dakota

Wolf Point

Culbertson

150 250

200 25

Great Falls

47?

200 0

Lewistown

Mosby

Glendive

250

Miles City

46?

Mosby Sandstone Member present

Bozman

Base modified from U.S. Geological Survey 1:2,000,000-scale digital line graph data (1980), which was digitized from the 1970 National Atlas of the United States. Universal Transverse Mercator projection, zone 13

Explanation

Isopach--Indicates lines of equal thickness of Belle Fourche Shale. Contour interval 50 ft. Number of data points is 200

Billings

SCALE 1:1 000 000

MILES KILOMETERS

ISOPACH MAP OF THE BELLE FOURCHE SHALE

STRATIGRAPHIC FRAMEWORK OF LOWER AND UPPER CRETACEOUS ROCKS IN CENTRAL AND EASTERN MONTANA

By Steven M. Condon

2000

Isopach data compiled by S.M. Condon, 1999

Extent of Mosby Sandstone Member modified from Rice, 1984

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