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for any science or branch of knowledge. He had a smattering of mechanics, of physiology, geology, mineralogy, and all other ologies whatsoever. De Quincey.

h. It sometimes constitutes extensive beds, as in the European Jurassic. See the Chart of Geology.

ediate or translational in character between the Silurian and Devonian ages. See Chart of Geology.

An old name for mineralogy and geology.

vonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology.

visions of geological time; as, the Tertiary period; the Glacial period. See the Chart of Geology.

The Permian period. See Chart of Geology.

The theory, early advanced in geology, that the successive rocks of the earth''s crust were formed by igneous fusion; -- opposed to the Neptunian theory.

A subdivision of the Chemung period in American geology. See Chart of Geology.

A subdivision of the Primordial or Cambrian period in American geology; -- so named from the sandstone of Potsdam, New York. See Chart of Geology.

st beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian.

the Purbeck stone, or Purbeck limestone, belonging to the Oölitic group. See the Chart of Geology.

The Quaternary age, era, or formation. See the Chart of Geology.

Canadian period have been divided in the American Lower Silurian system. See the Chart of Geology.

Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology.

ew York State belong largely to the Salina period of the Upper Silurian. See the Chart of Geology.

m, containing the brine-producing rocks of central New York, was formed. See the Chart of Geology.

onian system; -- so called from Schoharie, in New York, where it occurs. See the Chart of Geology.

In european geology, a name given to the middle division of the Upper Cretaceous formation.

That branch of geology which treats of the arrangement and succession of strata.