What setting is suggested by a circular region about 40 km across with predominant shales, a thick sandy delta sequence at one end, and both of them surrounded by a thin rim of sandy, well sorted beach deposits?

Question

Quizplus · Accepted Answer

The combination of predominant shales, a thick sandy delta sequence, and surrounding beach deposits suggests that this is a lake setting. The shales are likely deposited in the deeper, quieter parts of the lake, while the delta represents the influx of sediment from a major river feeding into the lake. The beach deposits suggest a relatively shallow, wave-influenced area at the perimeter of the lake.

What Setting Is Suggested by a Circular Region About 40