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Graded Assignment SCI112A: Earth Science | Unit 4 | Lessons 7 and 8: Laboratory: Interpreting Geologic History Name: Ayana Ortega Date: 1/4/16 Graded Assignment Lab Report: Interpreting Geologic History Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. In this laboratory experiment, you will write a narrative history of a rock section found in the Grand Canyon. You will describe and explain the events starting with the Vishnu Schist forming and ending with the unconformity above the Redwall Limestone in the Mississippian. Your description should include environmental changes. Example: 1. Sea level lowered, and the Esplanade Sandstone was deposited in a beach environment. Erosion, and the sea level rose. Hermit Shale deposited in a deeper sea. Sea level drops, returning the area to a beach environment where the Coconino Sandstone was deposited. Interpret the bottom half of the cross section below. Start with the Vishnu Schist and end with the Redwall Limestone. (16 points) Correct order: 1. Vishnu Schist 2. Zoroaster Granite 3. Bass limestone 4. Hakatar Shale 5. Igneous intrusion 6. Shinumo Quartzite 7. Dox Sandstone 8. Tepeats limestone 9. Bright Angel Shale Score 10. Muav limestone 11. Temple butte limestone 12. Redwall limestone © 2006 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 1 of 5 Graded Assignment SCI112A: Earth Science | Unit 4 | Lessons 7 and 8: Laboratory: Interpreting Geologic History Proper environmental changes: Erosion occurs after the Zoroaster granite, before the bass limestone. Temple butte limestone is formed in a shallow sea and erosion occurs before the Redwall limestone is laid down. : (6 points) 2. There is one of each type of unconformity in this diagram. Name at least one of each of them by indicating the layers that they are between. Score Nonconformity: Answer: The unkar Group shows angular unconformity because the layers are turned at angle. Angular unconformity: Answer: Specifically the angular unconformity occurs between the Cambrian and Precambrian rocks. The Dox sandstone, Shinumo quartzite, Hakatar shale, and bass limestone have been filled. An angular unconformity occurs between the Cambrian and Precambrian rocks. The Dox sandstone, Shinumo Quartzite, Hakatar Shale, and Bass limestone have been filled. Disconformity: Answer: The disconformities are marked irregular lines between the sedimentary rocks layers. © 2006 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 2 of 5 Graded Assignment SCI112A: Earth Science | Unit 4 | Lessons 7 and 8: Laboratory: Interpreting Geologic History Your Score © 2006 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 22 Page 3 of 5 Graded Assignment Symbol SCI112A: Earth Science | Unit 4 | Lessons 7 and 8: Laboratory: Interpreting Geologic History Name Environment Sandstone Beach or nearshore environment Limestone Forms in warm shallow seas Shale Igneous Rock (Granite) Deep sea Formed when rocks melt and then recrystalize Metamorphic Rock (Schist) Formed when rocks are severely deformed without melting; in this cross section, the Vishnu Schist represents the original surface in the area Igneous intrusion Magma melting and rising from deeper levels Hint: How can you tell the difference between an intrusion and rocks melting in place? Rocks melting in place usually appear as a large mass, whereas intrusions seem to have risen up from a source. © 2006 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 4 of 5 Graded Assignment SCI112A: Earth Science | Unit 4 | Lessons 7 and 8: Laboratory: Interpreting Geologic History © 2006 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 5 of 5