Moraine. A Swiss term for the débris of rocks brought down into valleys by glaciers.
Myricaciæ. Plants of the Gale family.
Mytilus. A marine shell, the mussel.
Neuropteris. A fossil fern of the coal-measures.
Nodule. A rounded irregular-shaped mass.
Nucleus. The solid center, about which matter is often collected to form solids.
Nummulites. A group of foraminiferous shells, some of them of large size and very abundant, occurring in rocks chiefly of the oldest tertiary period.
Oolite. A limestone composed of rounded particles, like the roe of a fish. The name Oolitic is applied to a considerable group of deposits in which this limestone occurs.
Organic. Exhibiting organization, or the results of vital force. Organic remains, or fossils, are the remains of the animals and vegetables of a former state of existence found buried in rocks.
Ornithic. Relating to birds.