What is suggested by the sheer volume of material transported and deposited to create these ancient layered beach features?

Answer

The water source (ocean or massive lake) was not ephemeral

The creation of extensive, layered features like beaches requires consistent wave energy acting over geological timescales, indicating that the water body responsible for forming them was large and long-lived, not temporary.

What is suggested by the sheer volume of material transported and deposited to create these ancient layered beach features?

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