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Lithomarge, lith′o-m�rj, n. a clay-like mineral substance, sometimes called Mountain marrow, soft, greasy to the touch, white, yellow, or red.

In Antrim the bole is associated with lithomarge, bauxite and pisolitic iron-ore.

The relation between laterite and lithomarge is discussed in p.

The whole of the hill on which the fort of Gwālior stands had evidently, at no very distant period, been covered by a mass of basalt, surmounted by a crust of indurated brown and red iron clay, with lithomarge, which often assumes the appearance of common laterite.

These are intermixed with masses and irregular beds of gray cinders and score, pumice, various kinds of lava, lithomarge, and fuller's earth.