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?

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This setting suggests a lake environment, where shales would form in deeper water, a sandy delta would form where a river enters the lake, and well-sorted beach sands would be found along the shoreline.

What Setting Is Suggested by a Circular Region About 40