Sedimentary rocks PHY 205

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Southern New Hampshire University *

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205

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Geology

Date

Feb 20, 2024

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docx

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Amber Smith Southern New Hampshire University PHY205 January 2024 Sedimentary Rocks My park I am researching is Glacier National Park in Montana and I will discuss that park for this short paper as well. The sedimentary rocks in Glacier National Park date back to the Precambrian age which is up to 800 million years ago. These rocks are typically known as the Belt series rocks when discussed. They were deposited in this area in what was the Belt Sea. A common sedimentary rock found in Glacier is limestone and dolomite. The areas these rocks are commonly found in Glacier include Altyn, Helena and Shepherd formations(“Geologic formations”, 2024). The Altyn formation for example is on the east side of Glacier National Park and appears to look white in color due to the dolomite in the formation. The Helena formation has a blue color limestone that appears to be a light brown color when looking. The Helena formation is located in the central area of the park. The Helena formation also has what is called the diorite sill which is a black color and was brought into the rock formation due to magma intrusion after the Helena formation rocks were there initially. The Shephard formation is near the Going-to-the Sun road. This formation includes limestone, dolomite, argillite, and siltstone. This formation seems to have more of a mix of different rocks than some of the other formations(“Stratigraphy”, 2024).

The carbonates which include limestone were deposited in this area in the Mississippian time period which is about 340 million years ago. These were deposited after the Belt Series rocks(“Stratigraphy”, 2024). There are economic values for limestone. Economic values for limestone include many construction uses. It can be crushed up and used to make cement which is then used for roadways and foundation base. It is commonly used in construction to build houses and other buildings. This includes window sills, walls, and roofs. Limestone can be used in agricultural ways and chemically by heating it up and then using it as a neutralization agent. It can be ground up and used in paint, paper, rubber and other similar materials. Since limestone is only in certain areas, it can be sold economically to those areas that want to use it for all the above uses(“Limestone”, 2024).

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