The Asthenosphere (from the Greekasthenia, "weakness") is the region of the Earth between 100-700km below the surface. This is the plastic (semi-molten) upper mantle.
... of gigantic ammonites, occur at Dui on the west coast, and Tertiary conglomerates, sandstones, marls and clays, folded by subsequent upheavals, in many parts of the ...