LaHood Formation—A Coarse Facies of the Belt Series in Southwestern Montana

Table Mountain Quartzite and Moose Formation (new names) and associated rocks of the middle Proterozoic Belt Supergroup, Highland Mountains, southwestern Montana

“…Rocks deposited in the Helena embayment are separated from cratonic rocks to the south by the low-angle Camp Creek fault zone in the Highland Mountains (McMannis, 1963; O'Neill and others, 1986) and by right-lateral, oblique-slip thrust faults of the Southwest Montana transverse zone farther to the east along the northern edge of the Tobacco Root Mountains (Schmidt and O'Neill, 1982) ( fig. 2A).…”

Tectonic features of the Precambrian Belt Basin and their influence on post-Belt structures

“…Isopach maps, facies, and fan-shaped directions of deltaic sedimentary transport radiating outward from south to north show clearly that sediments of many Belt formations had a cratonic source area from the south side of the Belt basin (Harrison, 1972;Hrabar, 1971) and thus indicate that at least at times a large cratonic prong or island formed the south side of the Belt basin reentrant. The basin boundary fault and associated coarse facies (LaHood Formation) of old Belt age in the Helena embayment were studied in some detail by McMannis (1963). Recent investigations by Winston (1973) indicated that much of the youngest Belt rock had a source area from the south and that a coarse conglomeratic facies of young Belt age occurs along the west side of the Dillon.…”

Mineral resources in Permian rocks of southwest Montana

“…Locally, much of the Belt sediment was also eroded before Cambrian deposition (l(lepper and others, 1957 ;McMannis, 1963 ;l\1axwell, 1959 ;Poulter, 1956) ; however, R6ss ( 1958a) questioned the existence of a major sub-Cambrian unconformity.…”

“…Hall (written commun., 1957), Honkala (1949b), Honkala (1953), Karlstrom (1948), Kennedy (1949 andwritten commun., 1952), Klemme (1949), Klepper (1950), Klepper and others (1957), M. R. Klepper (unpub. map compilation of region about Boulder Batholith), Love and others (1955), Lowell (1949), , McMannis (1955), Mann (1950), G. T. Moore (1956), Myers (1952), Peale (1896), E. S. Perry (unpub. map information, Three Forks area, Montana), Richards and Pardee (1926), Robinson (1963), Ross and others (1955), Ross and Forrester (1947), Sahinen (1939Sahinen ( , 1950, Scholten and others (1955), Skeels (1939), Swanson (1951), Theodosis (1955), and Wilson (1934b). rock produced by mining contains mostly phosphorite but may also contain mudstone, sandstone, carbonate rock, or chert that occur in thin layers or lenses within the mined sequence, and these rocks may be poorly to richly phosphatic.…”