Stratigraphic revision of the Green River Formation in Fossil Basin, WyomingOverfilled to underfilled lake evolution

Q3 Earth and Planetary Sciences

Rocky Mountain Geology Pub Date : 2011-09-01 DOI:10.2113/GSROCKY.46.2.165

H. Buchheim, R. Cushman, R. Biaggi

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引用次数: 15

Abstract

The Eocene Green River Formation in Fossil Basin, Wyoming provides a detailed record of the paleoecology and depositional history of ancient Fossil Lake. Fossil Lake was one of three Eocene lakes that formed an extensive lake system in Wyoming, Utah, and Colorado. It began as a flood-plain lake in the southern part of Fossil Basin and expanded northward as the lake evolved. Fossil Lake went through the major stages of lake evolution, including the overfilled (Road Hollow Member), balanced-fill (Fossil Butte Member), and underfilled (Angelo Member) stages. These stages are represented in the sedimentary record by a complete suite of lake-margin to lake-center facies. This study establishes the Road Hollow Member of the Green River Formation as representing the earliest stage of lake evolution in Fossil Lake. We also revise the boundaries for the Fossil Butte and Angelo Members of the Green River Formation, which clearly delineate the latest two stages of lake evolution. These revisions not only describe and add a previously unrecognized and thick sequence of lacustrine rocks in Fossil Basin, but help us to better understand the depositional systems that existed during each stage of lake evolution.

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怀俄明化石盆地绿河组地层修正:填湖到欠填湖演化

怀俄明州化石盆地始新世绿河组提供了古化石湖古生态和沉积历史的详细记录。化石湖是始新世的三个湖泊之一，在怀俄明州、犹他州和科罗拉多州形成了一个广泛的湖泊系统。它最初是化石盆地南部的一个洪泛平原湖泊，随着湖泊的演化向北扩展。化石湖经历了湖泊演化的主要阶段，包括过填期(路洞段)、平衡填期(化石丘段)和欠填期(安杰洛段)。这些阶段在沉积记录中表现为一套完整的湖缘到湖心相。本研究确定绿河组路洞段代表了化石湖最早的湖泊演化阶段。我们还对绿河组化石贝特和安杰洛的边界进行了修正，清晰地描绘了湖泊演化的最新两个阶段。这些修正不仅描述和增加了一个以前未被认识的湖相岩厚层序，而且有助于我们更好地了解湖泊演化各个阶段存在的沉积体系。

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来源期刊

Rocky Mountain Geology Earth and Planetary Sciences-Geology

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： Rocky Mountain Geology (formerly Contributions to Geology) is published twice yearly by the Department of Geology and Geophysics at the University of Wyoming. The focus of the journal is regional geology and paleontology of the Rocky Mountains and adjacent areas of western North America. This high-impact, scholarly journal, is an important resource for professional earth scientists. The high-quality, refereed articles report original research by top specialists in all aspects of geology and paleontology in the greater Rocky Mountain region.