Following the end of the last glaciation 15,000 years ago, the climate appears to have dried out somewhat as a layer of calcrete overlays the clay deposits.

Her assumption - backed up by endless simulations - was that the sheer grinding bulk of the weapon would be sufficient to push it through the thin layer of artificial crust overlaying the world's interior.

Several layers of corrugated sheeting alternating with sandbags overlaid the roof, and the windows were covered outside by steel mesh.

The third layer, however, directly overlays the first layer.

They were, as far as he could see through the thick layers of paint overlaying their skins, older than their officer companion.

A thick layer of dust overlaid everything, dulling the top surface to a near uniform grey, but it was not only the dust that obscured the body lying there.

Now a third layer of reality or illusion overlaid everything and I knew without question I was in very real danger of being swept away by the currents of aether coiling around me.