GEY 100 Roadcut Cross-Section Assignments Composite Roadcut Cross-Secti Consi ge
ID: 291730 • Letter: G
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GEY 100 Roadcut Cross-Section Assignments Composite Roadcut Cross-Secti Consi geologic history and imagine a composite roadcut that takes igneous rocks, sedimentary ider all that you have leamed about rock types, structures and New England faul ts s them into a single cross-section, weaving together a New England style geologic history USING THE PROPER FORMAT FOUND 1. Show a composite roadcut with igneous, sedimentary, metamorphic rocks deformed by folds and faults This drawing will take a bit more planning as you are free to apply your geologic knowledge and creativity in combining the rock ty pes and structures in any way you want in order to make a single cross section. Pay special attention to the contact relations between the different features and rock units so that they are geologically accurate and realistic. These contact relations include: -igneous intrusive contacts that cut across and truncate all other contacts -sedimentary contacts as layers and layers of sediment accumulate with conformable relations where each layer is parallel to the next as well as unconformable relations as in the angular unconformity where younger layers truncate tilted lower layers -metamorphic layers are typically the oldest and cut by younger intrusions and covered by younger sediments. You can't have metamorphic and sedimentary rocks together in the same sequence without having an unconformity or a fault between the older metamorphics and the younger, unmetamorphosed sediment layers. 2. You might try this with a larger size paper (11"x 17" ledger size paper would work well) to give you more room to work out the geologic details. Landscape format in 8" x 11" works OK as well. Either way make your roadcut "canvas" as long as possible. 3. Keep it simple. Combine just one element from each of the previous units into your composite cross-section. Include elemen ts from the Igneous, Sedimentary, Metamorphic, Fold, and Fault roadcut cross section assi gnments. 4. Remember to use appropriate colors and patterns for the rock types portrayed and to include all rock types and features in your legend. Make the color spectrum work for you in designing your color scheme. 5. Try to keep your legend as a single stack to show a continuous geologic development. A larger and longer paper size will give you more room to develop a single stack legend 6. Use geologic time period age assignments for rock units and structures within your section in accordance with the geologic history of Maine and the general New England area. Triassic is for normal faults and basalt dikes; Late Devonian is for granites; Folds Thrust faults are Early Devonian in age; Sedimentary rocks would be Middle to Late Devonian as ancient mountain sediments locally preserved or Triassic arkoses along normal fault bounded rift basins; and metamorphic rocks could be older possibly Precambrian age "basement" rocks of the ancient continental crust.Explanation / Answer
Yes these photos might be better, but my suggestion is as mentioned in your text, you should take large size paper draw your own and make it colourful, it will give clear image and non confuse understanding workout.
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