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Iron-ore resources of the United States including Alaska and Puerto Rico, 1955
Martha S. Carr, Carl E. Dutton
1959, Bulletin 1082-C
The importance of iron ore, the basic raw material of steel, as a fundamental mineral, resource is shown by the fact that about 100 million long tons of steel is used annually in the economy of the United States, as compared with a combined total of about 5 million long...
Geology of part of the Horseshoe atoll in Scurry and Kent Counties, Texas
Philip T. Stafford
1959, Professional Paper 315-A
The subsurface Horseshoe atoll is an arcuate accumulation of fossiliferous limestone 70 to 90 miles across in the northern part of the Midland basin, in western Texas. The stratigraphy, the lithologic character of the rocks, and the petroleum reservoirs of the southeastern part of the atoll in Scurry County and...
Conodonts from the Chappel limestone of Texas
Wilbert H. Hass
1959, Professional Paper 294-J
The Chappel limestone of Early Mississippian (late Kinderhook and probably partly early Osage) age crops out in the Llano region of Texas where it is as much as 45 feet thick. It contains three conodont faunal zones which, from youngest to oldest, are herein designated: (1) the Bactrognathus communis zone...
Geology of part of the Horseshoe atoll in Borden and Howard Counties, Texas
R. J. Burnside
1959, Professional Paper 315-B
The Horseshoe atoll is an arcuate mass of deeply buried fossiliferous limestone of Pennsylvanian and early Permian age in the Midland basin of west Texas. The southern part of the atoll is in southern Borden and northern Howard Counties. From early Strawn until early Wolf camp time this atoll, which...