Geology Question

Task 3 (15 points): Describe the Permian Park City Formation lithostratigraphy in essay format. Begin with a paragraph introducing the formation, giving its regional thickness, aerial occurrence, age, and generalized depositional environments based on regional information. Then describe Lithofacies I, II, III, and IV (from oldest to youngest) based on your observations in the Limekiln Gulch quarries.

PP file: https://drive.google.com/file/d/1ggYX4-exvFNojISu9…

Here, to give you an idea of what is expected for Task 3 is a:

Sample beginning of a description of the Park City Formation

The Middle Permian Park City Formation (Upper Leonardian/Lower Guadalupian North American stages = ~275 – 265 Ma) is predominantly a fossiliferous micrite deposited on a shallow, tropical carbonate shelf. Locally, it also contains dolomite, phosphorite, chert, and quartz sandstone lithologies (e.g., class handout). A common guide fossil is the brachiopod Punctospirifer pulcher (Stokes, 1988); crinoids, bryozoans, rugosan corals and fusulinids are also preserved. Its type section is in Big Cottonwood Canyon, but the formation is also exposed in thicknesses up to 600 meters in much of northern Utah, northeastern Nevada, southern Idaho, Montana, and Wyoming, and into western Colorado (http://3dparks.wr.usgs.gov/coloradoplateau/lexicon/parkcity.htm (Links to an external site.)).

For this project, approximately 30 meters of stratigraphic section were described within the lower third of the Park City Formation, exposed in the Limekiln Gulch limestone quarries northwest of the Big U above the University of Utah campus in Salt Lake City, Utah. These exposures are informally divided here into four conformable units based on contrasting lithofacies. The oldest, Unit I, comprises ~5.5 meters of tabular-bedded, medium-gray-weathering biomicrite with bed thicknesses ranging from 20 to 65 centimeters. The lower 3 meters are primarily detrital micrite containing up to 20% broken brachiopod tests up to about 1 cm in length, as well as sparse detrital crinoid stems up to 4 mm in diameter. A 25-cm-thick bed in the central part of the unit encloses up to 10% bryozoan colonies in growth position, ranging 0.8–1.5 cm in diameter and 2–10 cm in length. Two similar beds near the top of Unit I contain up to 90% crinoid stems with diameters 0.5 – 4 mm, oriented with stem axes perpendicular to bedding (growth position). Unit I also contains ~5% dark gray-weathering dolomite in small lenses and nodules, and in two beds about 10 mm thick (Figure__).

Unit II is 13-14 meters thick, but only the lower ~7 meters are accessible for examination…

Note: Please do not accept the assignment if your are not an expert.

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