Download E-books Tertiary and Cretaceous Coals in the Rocky Mountains Region: Casper, Wyoming to Salt Lake City, Utah June 29 - July 8, 1989 (Field Trip Guidebooks) PDF

Published via the yankee Geophysical Union as a part of the sector journey Guidebooks sequence, quantity 132.

The Paleocene coal-bearing sequences within the northern Powder River Basin are inside the Tongue River Member of the castle Union Formation and comprise anomalously thick (54 m) subbituminous coals. those thick coals were the objective of exploration and improvement for the prior few many years. For the previous decade, those coals have additionally been the item of depositional modeling reviews [Law, 1976; Galloway, 1979; Flores, 1981, 1983, 1986; Ethridge and others, 1981; Ayers and Kaiser, 1984; Warwick, 1985; Ayers, 1986; Moore, 1986; Warwick and Stanton, 1988].

Intensive modeling of those coals has led to significant faculties of concept. first of all, Galloway [1979], Flores [1981, 1983, 1986], Ethridge and others [1981], Warwick [1985], Moore [1986], and Warwick and Stanton [1988] think that the coals shaped from peat that accrued in swamps of fluvial platforms. The fluvial platforms are interpreted as a basin axis trunk-tributary complicated that tired to the north-northeast into the Williston Basin. Secondly, Ayers and Kaiser [1984] and Ayers [1986] think that the coals shaped from peat swamps of deltaic platforms. those deltas are anticipated to have prograded east to west from the Black Hills and infilled Lebo lake that was once centrally positioned alongside the basin axis.

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