Sedimentary+Rock+Identification+Lab+Answer+Key

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Liberty University *

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210

Subject

Geology

Date

Apr 3, 2024

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pdf

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4

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1 SEDIMENTARY ROCK IDENTIFICATION LAB Name: Answer Key Date: Objective To identify sedimentary rocks based on grain size, texture, and composition Materials • Clastic/Chemical Sedimentary Rock Charts • Mohs Hardness Scale (Optional, used in previous lab) Purpose (5 pts) Write 1–2 sentences stating the purpose of this lab. What do you expect to learn? What do you want the outcome to be? There should be complete sentences that answer the questions. Example: The purpose of this lab is to identify sedimentary rocks, identify textures and compositions, and categories (clastic, chemical, organic/biologic.) Hypothesis (5 pts) Write your hypothesis for this lab. It should be 1 sentence and be an if/then statement. (Remember this is your education guess as to what will happen in this lab.) This must be written as an if/then statement. Example: If I read the descriptions of a rock, I can successfully identify a sedimentary rock. Procedure 1. Read through all of the steps in the procedure as well as the Data section. Then complete the Purpose and Hypothesis sections. 2. Using the information provided in the Data table and the Clastic and Chemical Sedimentary Rock Chart to complete the Data table and name each sedimentary rock. 3. Complete the Observations , Analysis and Conclusion , and Application sections before submitting the lab assignment.
2 Data (60 pts) You may want to refer to the Mohs Hardness scale chart from the Mineral Identification Lab to help you decipher the composition based on hardness. You will also want to keep in mind that calcite reacts with Hydrochloric acid. (2 pts per blank = 60 pts total) Image Number Category (Clastic, Chemical, Organic/Biologic) Texture Hardn ess Composition or Sediment Name Rock Name 1 Chemical Fine to coarse Crystalline 3 Calcite Travertine 2 Organic/ Biologic Shells & cemented shell fragments 3 Calcite Coquina 3 Chemical Fine to coarse Crystalline 2 Calcite and some shell and skeleton fragments Rock gypsum 4 Organic/biologic Shell & shell fragment cemented with calcite 3 Calcite Fossiliferous limestone 5 Clastic Very Fine (< 1/256 mm) N/A Mud Shale 6 Clastic Medium (1/16 to 2 mm) N/A Sand Sandstone 7 Clastic > 2 mm N/A Gravel (rounded fragments Conglomerate 8 Chemical Very fine crystalline 7 Silica (Quartz) Chert
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