Raindrop impressions can appear as small craters or as small raised bumps.
2.
In order for raindrop impressions to be preserved in the rock record, the impression would have to have occurred towards the end of a rain shower.
3.
In this case, the raindrop impressions were created in the sediment, which was then followed by more sediment deposition that filled the impressions, creating, what appear to be, raised bumps on the bottom of the upper layer.
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