	*Witkind, Irving Jerome (1973) Igneous rocks and related mineral deposits of the Barker Quadrangle, Little Belt Mountains, Montana. Professional Paper* 752. US Geological Survey doi:10.3133/pp752**	Report (issue)
	Mountain _________ _ Porphyry of Galena Creek ___________ _ Snow Creek(?) Porphyry ____________ _ Chemistry...________________ _ Peterson fault ------------------Otter laccolith -----------------------Asymmetric laccoliths...deposits --------------------------------Barker mining district -----------------------Fissure veins in the...ation -----------------------------San Miguel district -------------------------Ore potential ------... 8. Index map of part of Montana and the study area -----------------------------------------------Map
	*Wright, H. E. Jr., Mattson, L. A., Thomas, J. A. (1970) Geology of the Cloquet Quadrangle, Carlton County, Minnesota. Geologic Map Series* GM-3. University of Minnesota - Minnesota Geological Survey**	Report (issue)
	It has only one conspicuous marker bed, the Otter Creek unit, so the stratigraphic thickness across the...During final withdrawal of the Superior Lobe from the area, the St. Louis River, which carried the out¬ flow...metasedimentary unit of Precambrian age in the Lake Superior district, and (2) repeated advance of the Superior glacial...diversion of the St. Louis River. The geology of the area was first explored by Winchell (1899, pp. 1-24)...General The rocks exposed in the Cloquet quadrangle area are of two major groups — folded metasedimentary
	*, (1976) Geological Survey research 1976. Professional Paper* 1000. US Geological Survey doi:10.3133/pp1000**	Report (issue)
	S. geothermal re·sources assessed-Continued 40 Alaska ---------------------------41 Arizona ___ ----...leistocene _____ - ------------- _--------Urban area studies --------------------Stratigraphy ------...---------Washington ---------------------------Alaska ------------------------------------General --...-------------------------------Northern Alaska ------------------------ 44 44 44 45 45 46 46 46 47 48...investigations-Continued Alaska-Continued Central Alaska ------------------------Southern Alaska -----------------------SouthE'
	*Rubey, William W. (1952) Geology and mineral resources of the Hardin and Brussels quadrangles (in Illinois) Professional Paper* 218. US Geological Survey doi:10.3133/pp218**	Report (issue)
	terrace (Illinoian) __________________ _ 119 Metz Creek terrace (Iowan or Wisconsin) _____ _ 120 Alluvial...(Wisconsin) ______________ _ 120 Terraces along Macoupin Creek _____________ _ 121 122 Final stages in development...123 127 Comparison of regimen of major rivers of area __ Peculiarities of Illinois River ________________...Illinois River; B, Lower part of valley of Macoupin Creek and Illinoian till plain___ .50 50 66 82 82 90...juncture of Mississippi and Illinois Rivers. Their area includes part of one of the sharpest zones of rock

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Ilmenite from Otter Creek Mines, Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USA

Ilmenite from
Otter Creek Mines, Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USA