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- catalog abstract "The geology of six geographically separated but geneti- cally related heavy-mineral placer deposits are investigated along 40 miles of coastal-marine sandstone outcrops comprising the McCourt Sandstone Tongue. The heavy- mineral placer deposits consist of dark-brown to black, fine- to medium-grained, ferruginous sandstones that occur in elongated lenses that are as much as 6.6 ft thick and 2,000 ft long. The placer deposits are mostly intercalated with light-gray or tan quartzose shoreline sandstones that offlapped southeastward across the study area and formed a strand plain during a regression of the interior Cretaceous sea. The placers were deposited along a single shoreline during one stage of the regression. The heavy-mineral placer deposits are composed of about 85 percent opaque iron minerals, mostly magnetite, hematite, and ilmenite, and about 15 percent nonopaque minerals, mostly zircon, with minor amounts of tourmaline, rutile, garnet, sphene, hornblende, apatite, and traces of other minerals. The depositional settings are river mouth, berm, forebeach, surf, and middle shoreface, where the segregation of light and heavy minerals took place by fluvial, marine, and eolian processes. A plutonic source for most of the heavy minerals was probably the Sevier orogenic belt located 150-250 miles west of the study area. The heavy-mineral deposits in the McCourt Tongue are analogous in origin to that of heavy-mineral deposits that are presently forming along the southeast Atlantic and gulf coasts of the United States.".
- catalog alternative "Origin and distribution of six heavy mineral placer deposits in coastal-marine sandstones ...".
- catalog alternative "Placer deposits, McCourt Sandstone Tongue, Rock Springs Formation, southwest Wyoming.".
- catalog contributor b2579213.
- catalog contributor b2579214.
- catalog coverage "Rock Springs Formation (Wyo.)".
- catalog created "1989.".
- catalog date "1989".
- catalog date "1989.".
- catalog dateCopyrighted "1989.".
- catalog description "Includes bibliographical references.".
- catalog description "The geology of six geographically separated but geneti- cally related heavy-mineral placer deposits are investigated along 40 miles of coastal-marine sandstone outcrops comprising the McCourt Sandstone Tongue. The heavy- mineral placer deposits consist of dark-brown to black, fine- to medium-grained, ferruginous sandstones that occur in elongated lenses that are as much as 6.6 ft thick and 2,000 ft long. The placer deposits are mostly intercalated with light-gray or tan quartzose shoreline sandstones that offlapped southeastward across the study area and formed a strand plain during a regression of the interior Cretaceous sea. The placers were deposited along a single shoreline during one stage of the regression. The heavy-mineral placer deposits are composed of about 85 percent opaque iron minerals, mostly magnetite, hematite, and ilmenite, and about 15 percent nonopaque minerals, mostly zircon, with minor amounts of tourmaline, rutile, garnet, sphene, hornblende, apatite, and traces of other minerals. The depositional settings are river mouth, berm, forebeach, surf, and middle shoreface, where the segregation of light and heavy minerals took place by fluvial, marine, and eolian processes. A plutonic source for most of the heavy minerals was probably the Sevier orogenic belt located 150-250 miles west of the study area. The heavy-mineral deposits in the McCourt Tongue are analogous in origin to that of heavy-mineral deposits that are presently forming along the southeast Atlantic and gulf coasts of the United States.".
- catalog extent "v, 34 p. :".
- catalog isPartOf "U.S. Geological Survey bulletin ; 1867".
- catalog issued "1989".
- catalog issued "1989.".
- catalog language "eng".
- catalog publisher "[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by the Books and Open-File Reports Section,".
- catalog spatial "Rock Springs Formation (Wyo.)".
- catalog spatial "Wyoming Rock Springs Formation.".
- catalog spatial "Wyoming Sweetwater County.".
- catalog subject "Heavy minerals Wyoming Rock Springs Formation.".
- catalog subject "Heavy minerals Wyoming Sweetwater County.".
- catalog subject "Placer deposits Wyoming Rock Springs Formation.".
- catalog subject "Placer deposits Wyoming Sweetwater County.".
- catalog subject "QE75 .B9 no. 1867 TN24.W8".
- catalog subject "Sandstone Wyoming Rock Springs Formation.".
- catalog subject "Sandstone Wyoming Sweetwater County.".
- catalog title "Origin and distribution of six heavy mineral placer deposits in coastal-marine sandstones ...".
- catalog title "Origin and distribution of six heavy-mineral placer deposits in coastal-marine sandstones in the Upper Cretaceous McCourt Sandstone Tongue of the Rock Springs Formation, southwest Wyoming / by Henry W. Roehler.".
- catalog title "Placer deposits, McCourt Sandstone Tongue, Rock Springs Formation, southwest Wyoming.".
- catalog type "text".