Raindrop imprints 5
Raindrop imprints are scarce, but highly diagnostic, sedimentary structures. They absolutely demonstrate that a particular bedding plane was subaerially exposed - it had to be land. Raindrop imprints are expected to be small circular to subcircular pits or craters on fine-grained siliciclastic sediment surfaces. They may be associated with mudcracks and terrestrial fossils (such as fossil ferns).