sentences:  The deposits are much finer grained than the deposits of magmatic eruptions, due to the much higher fragmentation of the type of eruption.The deposits appear better sorted than magmatic deposits in the field because of their fine nature, but grain size analysis reveals that the deposits are much more poorly sorted than their magmatic counterparts.A clast known as an accretionary lapilli is distinctive to phreatomagmatic deposits, and is a major factor for identification in the field.