Marl

... uneasie steps / Over the burning Marle, not like those steps / On Heavens Azure...

Mr. Greenshields was the contractor selected to build the embankment, and over a hundred thousand tons of marl and moss compacted with brushwood were used in its construction.

Important marl and marine-shell deposits are worked in Michigan, Virginia, and Florida.

The surroundings were unearthly. It was not a fish setting—only bare rock, no trees, pungent sagebrush, and marl dust floating when a truck passed.

Those loved unhappy shades whom Dante turned / To sticks and marl