GEOL 247 Lab 3 (2024)

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University of Saskatchewan *

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224

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Geology

Date

Feb 20, 2024

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pdf

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8

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/4 Exercise 1. (Drawing) Draw the stromatoporoid found at the back of the lab. Label the structures: mamelon, astrorhiza, pillar, lamellae, and gallery.
/2 Exercise 2. (Written answer) What kind of organisms are stromatoporoids and stromatolites? What features can you use to differentiate them? What ecological roles do each fulfill?
/4 Exercise 3. (Drawing) Draw the archaeocyathid found at the back of lab. Label the structures: outer wall, inner wall, central cavity, and intervallum. /3 Exercise 4. (Written answer) What geologic period is this archaeocyathid specimen from? What is the fossil composed of? What feature(s) about archaeocyathids allow us to categorize them as sponges?
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