Marl
a mixture, naturally existing, of clay, and carbonate of lime. Marls are found in very different geological forma- 12 verses of Mark (xvi: 9-20) are of tions, but everywhere seem to owe their doubtful authenticity. External testi- origin to deposition by water. The name mony is perhaps slightly in their favor, mixtures of clay and sand, in which there is sometimes applied to friable clays, or but internal evidence is strongly against them; hence, in the Revised Version, they is almost no trace of lime; but the presinternal evidence is strongly against is almost no trace of lime; but the presthem; hence, in the Revised Version, they are separated by an interval from the rest of the book.
MARK, a Pope and saint, succeeded Sylvester I. in 336, and died the same year. There passed under his name an epistle addressed to St. Athanasius. ence of a notable proportion of carbonate of lime is essential to marls, properly so called. This proportion varies from 6 to 20 per cent. Marly soils are in general of great natural fertility. Marl is very advantageously used as a manure; acting both chemically and mechanically; MARLBOROUGH but different kinds of marl are of very different value in this respect. The use of marl as a manure has been practiced from ancient times.