United States Geological Survey YearbookThe Survey, 1987 - Forest reserves |
From inside the book
Results 1-5 of 60
Page 14
... mined from surficial geologic maps and hydrogeologic maps . Adjacent till and bed- rock areas that are not drained by peren- nial streams also contribute recharge , • • 227T 1 1 1 1 1 1 1 13 3 3212 2 1 1 1 1 either from subsurface ...
... mined from surficial geologic maps and hydrogeologic maps . Adjacent till and bed- rock areas that are not drained by peren- nial streams also contribute recharge , • • 227T 1 1 1 1 1 1 1 13 3 3212 2 1 1 1 1 either from subsurface ...
Page 25
... mining districts , including the Upper Mississippi Valley lead - zinc district , the Illinois - Kentucky fluorspar ... mines may be mineral resources of compa- rable value . The complex Precambrian rocks ( more than 570 million years old ) ...
... mining districts , including the Upper Mississippi Valley lead - zinc district , the Illinois - Kentucky fluorspar ... mines may be mineral resources of compa- rable value . The complex Precambrian rocks ( more than 570 million years old ) ...
Page 26
... terrane ( 3.0-3.6 billion years old ) ; includes granite ( 2.6 billion years old ) Limit of outcrop Fault or shear zone EXPLANATION Geologic deposit type mined principally for their platinum -. 26 U.S. Geological Survey Yearbook 1987 26.
... terrane ( 3.0-3.6 billion years old ) ; includes granite ( 2.6 billion years old ) Limit of outcrop Fault or shear zone EXPLANATION Geologic deposit type mined principally for their platinum -. 26 U.S. Geological Survey Yearbook 1987 26.
Page 27
... mining indus- tries gathered at a workshop on the geol- ogy of the early Mesozoic ( 180-230 million years ( m.y. ) old ) basins of eastern North America , held at the USGS National Cen- ter during May 1987. The workshop was designed as ...
... mining indus- tries gathered at a workshop on the geol- ogy of the early Mesozoic ( 180-230 million years ( m.y. ) old ) basins of eastern North America , held at the USGS National Cen- ter during May 1987. The workshop was designed as ...
Page 28
... mined by the Stillwater Mining Company , a joint venture of Chevron Corporation , Lac Min- erals Limited , and Manville Corporation ( fig . 4 ) . The J - M Reef was discovered in 1973 and has been extensively explored since then . This ...
... mined by the Stillwater Mining Company , a joint venture of Chevron Corporation , Lac Min- erals Limited , and Manville Corporation ( fig . 4 ) . The J - M Reef was discovered in 1973 and has been extensively explored since then . This ...
Other editions - View all
Common terms and phrases
activities Administration Alaska analysis aquifer areas Award basin Board Bureau Calcasieu River cartographic cartographic data Chief Hydrologist City City of w climate coal coastal Commission concentrations contamination cooperative Coordination County data base Denver Denver Federal Center Department of Public deposits Earth Science earthquake energy environment Environmental fiscal flow geographic information systems Geologic Division geologic map Geologist geophysical global change gram graphic ground water ground-water hazards hydrologic Hydrologist investigations Irrigation Lake Lake Nyos land located Management ment miles mineral resources National Center National Mapping Division natural Office organic Park percent Planning processes radon Regional Reston River rocks samples San Joaquin River scientific scientists sediment seismic selenium Service soils Stop streamflow studies surface tion Transportation U.S. Geological Survey United users USGS Valley Volcano Water Conservation District Water District water quality Water Resources water-quality wetlands zone