Exercise_12_Paleoecology_II_2023

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Texas A&M University *

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314

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Geology

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Dec 6, 2023

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docx

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Paleoecology II – Assemblages and Depositional History Part 1. Fossil Slabs and Assemblages (Complete by end of lab period) In the previous lab, you identified the ages and environments of deposition for three fossil slabs. The TAs have given you feedback on your determinations. Find a partner that did a different set of slabs. Revisit the slabs together, correcting any errors and exchanging information. Repeat until you have seen and recorded ages and depositional environments for all 8 slabs in the list. Fill out the table below. Slab # Important Taxa Age Depositional Environment Set #1 (Z and Y) #4 #5 #8 #9 #10 #11 (Cream Limestone) #12

Last time, you also looked at loose a fossil assemblage as well. For your assemblage fill out the table after making any corrections necessary. Look at and fill out the table for an assemblage another student completed. Assemblag e Important Taxa Age Depositional Environment Terrestrial Assemblages (New to this lab) Sample Important Taxa Age Depositional Environment #6 #13 #14 Slabs without visible fossils (New to this lab) For each of these, use the sedimentology and sedimentary structures to reconstruct the depositional environment. Slab Sedimentology Sedimentary Structures Depositional Environment #3 Age: Paleocene #2 Age: Early Triassic #7 Age: Silurian

Part 2: Stratigraphic Interpretation (Due Week of April 24) Imagine that we have taken the slabs from an outcrop. We have recorded the stratigraphic location of each slab. Using this information and the determinations you made in the Paleoecology II lab, you will draw a stratigraphic column. Each slab has a number and a level from which it came in the outcrop – which is 300 m of section (below left). Slabs came only from the uncovered intervals. Fossil assemblages were collected from covered intervals. Using your corrected lab, reconstruct the outcrop using the template included on a later page. Use the symbols below to indicate the lithology and the fossil occurrences in the graphical column. Next to the graphical column, include a descriptive column and construct a relative sea level curve based on your interpretations of the depositional environments. 300 m total section Unit containing Slab Slab #14 – 290-300 m Slab #3 – 267-269 m Slab #10 – 258-267 m Slab #11 – 230-253 m Slab #9 – 218-230 m Slab #2 – 198-218 m Slab #4 – 174-198m Slab #13 – 136-174 m Slab #6 – 102-136 m Slab #8 – 65-87 m Slab #5 – 40-60 m Slab #7 – 28-40 m Slab #12 – 8-28 m Slab #1 – 5-8 m Covered section 269-290 m Covered section 253-258 m Covered section 87-102 m Covered section 60-65 m Covered section 0-5 m On your stratigraphic column, note which covered intervals that the assemblages in your table above would fall within. Include those assemblages information in your environmental interpretations. Note, some slabs from the previous lab may not be present in this exercise. Lithological patterns – If you add a new one, you must add it to this legend.

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