2 adjectives to describe atone

An exsiccated body of a female * * * was found at the depth of about 10 feet from the surface of the cave bedded in clay strongly impregnated with nitre, placed in a sitting posture, incased in broad stones standing on their edges, with a flat atone covering the whole.

This Goethe himself expressed as the central thought of this drama in the lines: Alle menschlichen Gebrechen Sühnet reine Menschlichkeit (For each human fault and frailty Pure humanity atones).

2 adjectives to describe  atone