A volcanic eruption on the coast of Japan in 1850 deposits a…

A volcanic eruption on the coast of Japan in 1850 deposits a layer of ash on top of a layer of red clay, and the ash is covered by a layer of silt in a tsunami in 1902. Archaeologists find a coin between the ash and the silt, and they find a small pot between the ash and the clay. Given this sequence of events, which statement is true?