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A Possible Late Pleistocene Impact Crater in Central North America and Its Relation to the Younger Dryas Stadial

Tovar Rodriguez, David (2020-08-04)
The causes that started the Younger Dryas (YD) event remain hotly debated. Studies indicate that the drainage of Lake Agassiz into the North Atlantic Ocean and south through the Mississippi River caused a considerable ...

Geology of a Sulfide Deposit in Lower Precambrian Metavolcanic-Metasedimentary Rocks near Birchdale, Koochiching County, Minnesota

Listerud, William Harold (1974-02-22)
The Birchdale area lies near the southern edge of the Superior Province of the Canadian Shield. The rocks are felsic-intermediate metatuffs, metasediments, granite, and mafic intrusives. The rocks are part of a northwest ...

Metamorphism and Hydrothermal Alteration of Early Proterozoic Diabases in the Republic Mine, Northern Michigan

Yin, Xinping (1994-09)
Early Proterozoic diabases in the Republic Mine, Northern Michigan have undergone pre-metamorphic hydrothermal alterations, followed by regional and retrograde metamorphism. High calcic plagioclase, pyroxene and olivine ...

The Petrology and Sedimentation of the Lower Proterozoic Barron Quartzite, Northwestern Wisconsin

Rozacky, Wendy Johnson (1987-05-20)
The Barron Quartzite of northwestern Wisconsin is a fine-grained, quartz-cemented, buff to red quartz arenite with minor interbedded argillite and a thin basal quartz-pebble conglomerate. The thickness of the Barron is at ...

The Geology of the Skinner Peaks Quadrangle, Juab and Sanpete Counties, Utah

Felger, Tracey Jan (1991-03)
The geology of the Skinner Peaks 7 .5 minute quadrangle has been mapped at a scale of 1:24,000. The quadrangle is located m central Utah, just west of the leading edge of the Sevier fold-and-thrust belt, and in the transition ...