Definitions

from The Century Dictionary.

  • noun In geology, a name given in Switzerland to an important geological formation belonging in part to the Miocene and in part to a position intermediate between the Eocene and the Miocene.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geol.) A soft Tertiary sandstone; -- applied to a rock occurring in Switzerland. See Chart of geology.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A shallow deposit of sandstone, shale and conglomerate in front of a rising mountain chain.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French molasse, from Latin mollis.

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