>>939367364
and for a more instantaneous and dramatic example of natural layer formation - of "dirt" forming over time, here's the ruins of Herculaneum, a Roman town buried in the eruption of Mt Vesuvius in 79AD.

on the left are the roman ruins. on the right, that isnt a wall - that's the modern surface at the top, and a ramp cutting down through rock ash. the entire town was buried under 10-20m of volcanic ash, killing everyone there