Significados de red marl em inglês

The red marl must almost certainly have been black slate somewhere, somewhen.

The salt rock in Cheshire lies in strata of red marl.

Green and red marl, shale, and shaly limestone with some veins of gypsum.

Rich lowlands and oolites suit the cereals; red marl produces wonderful grazing grass; bare uplands are best for gorse and heather.

The difference in colour between black slate and red marl is caused simply by the oxidation of the iron in the slate.

And if my readers want a probable cause why the sandstones lie undermost, and the red marl uppermost-canthey not find one for themselves?

And the red marl-thegreat deposit of red marl which covers a wide region of England-whyshould not it have come from the same quarter?

But its rich red marls, wherever they come to the surface, are one of God's most precious gifts to this favoured land.

(* Magnesian limestone is of a straw-yellow colour, and contains madrepores: it lies beneath red marl, or muriatiferous red sandstone.)