A snake spiral sits coiled above a sphere, (semi-circle on original), flanked by two crescents;probably representing the phases of the Moon, around this are successive layers of streams or rain torrents, "M" signs withiin lozenges, an arcing torrent and more crescents. Spiral, rain, and lunar crescent are purposely combined to create what may be a seasonal tableau.
The Language of the Goddess, Marija Gimbutas Pg. 286