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One core contains what appears to be lithified layers of soil, which could capture indicators of the atmosphere’s composition.

The bedrock under these modern dunes is the Navajo Sandstone, the lithified remains of a 180-million-year-old desert.

Rain tumbling on to the ash would have dug out small depressions, which were then subsequently covered over by further ash deposits and lithified, or turned to stone.

Description of the lithified deposits would be far from complete without reference to the later diabase which is associated with the Newark rocks.

They become lithified as it were and constitute the strata of the psychozoic stage'—I told you the butter's at the spring.