Possible Short Answer Question 2: (15 points total) Think about sedimentary rock

Question

Possible Short Answer Question 2: (15 points total) Think about sedimentary rocks and how they can inform us about past environments! A) Fill-in the table below for the four different sedimentary rocks. Provide at least two observations for each rock. For a rock that is a clastic sedimentary rock, one of those observations must be about the grain-sized. (remember, some grain sizes are too small to observe even with a hand lens and in that case an observation would be that the grain-size is smaller than can be resolved even with a hand lens) Additionally, provide a list of as many depositional environments that you can recall that could produce such a sedimentary rock. (8 points-for each rock: 1 points for observations &1 points for depositional environments) Table 3: Observations & Potential Deposition Environment for Sedimentary Rocks Sedimentary Observations Potential Depositional Environments Rock Name limestone mudstone sandstone coal

Explanation / Answer

A)

Sedimentary rock

name

Potential depositional

environment

Finely laminated and

imprints of marine shells

B)

Sedimentary rock

name

Potential depositional

environment

Finely laminated and

imprints of marine shells

C) Sandy limestone at the top of the succesion indicates the transgression or sea level rise. Because limestone deposited in shallow marine environment. Coal beds are deposited in swampy marsh environment. during transgression sea level enters to the sea and form shallow marine environment and deposited limestone at the top of the coal beds.

Sedimentary rock

name

Observations

Potential depositional

environment

Limestone Fossils present Shallow marine Mudstone

Finely laminated and

imprints of marine shells

Shelf to shallow marine Sandstone Showing ripple structure (wave ripples) Beach Coal Swamp or marsh

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