A geologist is mapping Carboniferous rocks, all of about the same age, located in the middle of a continent. The geologist's map reveals that the rocks are sandstone in one area, grading into shale
in an adjacent area, and then grading into limestone. What can she infer about the depositional
environment during the Carboniferous Period in this area?
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The area was probably located in a deep marine environment.

The area was probably located at the mouth of a large river.

The area was once a wind-blown desert.

The area was probably located along a coastline.