Sentence examples for ash layer from inspiring English sources
Over time, this ash layer solidified into a soft, easily eroded, whitish rock called tuff.
The lowermost Triassic ash layer occurs ~5 m above the base of the microbial limestone at Shanmenhai (SHA-F).
Another blow landed in 1989 when scholars on Crete found, above a Thera ash layer, a house that had been substantially rebuilt in the Minoan style.
However, the presence of the ash layer minimizes the heat effect.
Back-diffusion, grate design, and ash layer buildup, hitherto neglected, are shown to have significant effects.
Ultra-distal dispersal from our simulations (>2500 km NE from source) is consistent with analyses of the CI ash layer identified in the Russian Plain21.
While the lapilli deposit fines slightly towards the top of the deposit, the boundary with the overlying vitric ash layer is sharp.
At Shanmenhai, Nanem and Tienbao, this intervening ash layer is missing and the volcanogenic sandstone directly rests on top of the microbial limestone.
Within lake sediments at LGdM, the CI deposit was separated into a 16.5 cm thick coarse lapilli pumice fall overlain by a 13 cm thick vitric ash layer.
The thickness of ice above the ash layer provided an estimate of the date of the eruption: 207 B.C., give or take 240 years.
The ER 1470 skull and other H. habilis specimens recovered below this ash layer, therefore, must be close to two million years old.
