GLY 1010 Geology of

GLY 1010 Geology of

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GLY 1010 Geology of

Exploring the geology of Acadia National Park (Maine). Now that you know the basics of the three major rock groups, you can investigate the geology of a given state or national park before you visit. The quality of information available for individual parks varies widely, but it so happens that the Maine Geological Survey has posted a number of excellent guides to park geology. Visit www.mine.gov/doc/nrimc/mgs/explore/bedrock/ and click on The Geology of Mount Desert Island, which comprises most of Acadia National Park.

Click on the Bedrock Geology of Mount Desert Island (2.5 Mb PDF file) link to get a geologic map of the island. This map shows you the type of rocks that you will find either exposed at the surface or under a thin covering of loose soil or sediment anywhere on the island.

Along the right side is a map explanation that describes each of the rock units (youngest at the top to oldest at the bottom), the map symbols, and several specific sites of interest. Note that each different body of rock has a different name and a three-letter code and specific color to mark its locations on the map.

Examine the map and look for the presence of map units with the letter ‘g’ in their code (e.g., Did, DC, Ds, Dsg1, etc.). The ‘D’ stands for a period of geologic time called the Devonian, ‘g’ stands for one of two rock types, and the remaining letter often refers to the name of the formation (e.g., ‘c’ stands for Cadillac).

Read the description of the oldest rock unit, the Ellsworth Schist.

Now open the geology page of the Acadia website – National Park Service. What were the parent rocks of the Ellsworth Schist?

The folded Ellsworth Schist shows a variety of compression features.

Given the abundant igneous intrusions and evidence for directed pressure, what type of tectonic boundary was present along the Maine coast (e.g., ocean-continent convergent, continent-continent convergent, ocean-ocean divergent, continent-continent divergent, transform, etc.)?

Look at the map of the Earth’s tectonic plates inside the front cover of your lab manual. Is a plate boundary still located along the coast of Maine?

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(1) According to the Explanation, what type(s) of rock does the ‘g’ stand for?

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(2) Are the ‘g’ units a minor part of the island, or do they dominate much of the park?

(3) Did these ‘g’ units form on the surface or deep underground?

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(1) What three minerals does this schist contain?

(2) Of these three minerals, which is the best index mineral? What metamorphic grade does it indicate for the Ellsworth Schist (see Fig. 5.12)?

(3) Where on the island do you find the Ellsworth Schist?

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(1) What type of metamorphism might have formed this shist?

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(2) Describe two features resulting from directed pressure during this metamorphism.

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If you like, continue reading the materials posted on the website to learn more about the park. In general, you will find that if you know something about the geology of the park, you will pay more attention to the rocks and find more interesting things to think about during your visit. Understanding geology definitely makes the world a more interesting place!

GLY 1010 Geology of

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