Depositional Environments 51 Exercise 4 3. Rocks of the Cedar Mountain Formation

Question

Depositional Environments 51 Exercise 4 3. Rocks of the Cedar Mountain Formation were PART most likely deposited in which of the sedimen- tary environments listed in table 4.1? Explain your answer Cedar Mountain Formation, Early Cretaceous, San Rafael Swell, Utah (Figure 4.9) 1. What two sedimentary rock types predominate in this formation? 4. Explain why dinosaur skeletons collected from 2. How would you describe the shape of the sand- stone bodies shown in the satellite view of the area (figure 4.9C)? shales at locality 1 on figure 4.9A are more likely to be complete than dinosaur remains collected from sandstones at locality 2 on figure 4.9A.

Explanation / Answer

1. Pebble conglomerate and sandstone are two Predominant sedimentary rock type in this formation

2. The shape of the sandstone bodies looks like a snake in the satellite view of the area as shown in fig. 4.9C

3. Rocks of cedar mountain formation were most likely deposited in continental meandering stream (fluvial) depositional environment as it's rock type , sedimentary structure as well as its texture matches to this continental meandering steam fluvial environment.

4. Because of cut and fill structure of sandstones layer the dinosaur fossil/ bones get disarticulated and broken but shale comprises of laminated to blocky structure so that's why fossil of dinosaur get well preserved in shale rather than sandstone.

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