What is the dominant sedimentary rock type shown in figure 4.10? Conglomerate Sa
ID: 804458 • Letter: W
Question
What is the dominant sedimentary rock type shown in figure 4.10?
Conglomerate
Sandstone
Shale
Limestone
What does the black color suggest about the environment of deposition (figure 4.10)?
Deposition occurred in a low-oxygen environment.
Deposition occurred under direct sunlight.
Deposition occurred where iron was absent.
Deposition occurred near an intense heat source.
What additional information is provided by the types of fossils in the Mancos Shale (figure 4.10)?
The fossils indicate that the Mancos was deposited in a marine environment.
Some fossils are marine and others are from the land, indicating that the Mancos was deposited along a shoreline or in shallow water.
The fossils are land plants and animals, suggesting the Mancos was deposited in a continental environment.
The fossils are freshwater plants and fishes, suggesting the Mancos was deposited in a lake
Rocks of the Mancos Shale (figure 4.10) were most likely deposited in which of the sedimentary environments listed below?
The fossils indicate that the Mancos was deposited in a marine environment.
Some fossils are marine and others are from the land, indicating that the Mancos was deposited along a shoreline or in shallow water.
The fossils are land plants and animals, suggesting the Mancos was deposited in a continental environment.
The fossils are freshwater plants and fishes, suggesting the Mancos was deposited in a lake.
Select the answer choice below that best explains the reasoning for your conclusions about the depositional environments of the Mancos
Fine-grained and well-sorted nature of the sediment, undisrupted laminae, fossils of swimming marine organisms
Variably sorted nature of the sediment, cross-bedding and ripple marks, and well-preserved fossils of creatures that inhabit deserts
Fine- to medium-grained and well-sorted nature of the sediment, sand-filled channels and cut-and-fill structures, fossils of freshwater invertebrates
Coarse-grained and well-sorted and angular nature of the sediment, fossils of terrestrial invertebrates
Conglomerate
Sandstone
Shale
Limestone
Explanation / Answer
What is the dominant sedimentary rock type shown in figure 4.10?
Answer is Shale
Shale is an argillaceous sedimentary rock.
What does the black color suggest about the environment of deposition (figure 4.10)?
Answer is Deposition occurred in a low-oxygen environment.
Black indicates absence of oxygen.
What additional information is provided by the types of fossils in the Mancos Shale (figure 4.10)?
Answer: The fossils indicate that the Mancos was deposited in a marine environment.
Rocks of the Mancos Shale (figure 4.10) were most likely deposited in which of the sedimentary environments listed below?
Answer: The fossils indicate that the Mancos was deposited in a marine environment.
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