The Ancient Life History of the Earth: A Comprehensive Outline of the Principles and Leading Facts of Palæontological ScienceNicholson, Henry Alleyne
Science
The Ancient Life History of the Earth: A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science
Nicholson, Henry Alleyne
Paleontology
In _France_, the Lower Miocene is represented in Auvergne, Cantal,
and Velay, by a great thickness of nearly horizontal strata of
sands, sandstone, clays, marls, and limestones, the whole of
fresh-water origin. The principal fossils of these lacustrine
deposits are _Mammalia_, of which the remains occur in great
abundance. In the valley of the Loire occur the typical European
deposits of Upper Miocene age. These are known as the "Faluns,"
from a provincial term applied to shelly sands, employed to spread
upon soils which are deficient in lime; and the Upper Miocene
is hence sometimes spoken of as the "Falunian" formation. The
Faluns occur in scattered patches, which are rarely more than 50
feet in thickness, and consist of sands and marls. The fossils
are chiefly marine; but there occur also land and fresh-water
shells, together with the remains of numerous Mammals. About 25
per cent of the shells of the Faluns are identical with existing
species. The sands, limestones, and marls of the Department of
Gers, near the base of the Pyrenees, rendered famous by the number
or Mammalian remains exhumed from them by M. Lartet, also belong
to the age of the Faluns.
In _Switzerland_, between the Alps and the Jura, there occurs
a great series of Miocene deposits, known collectively as the
"Molasse," from the soft nature of a greenish sandstone, which
constitutes one of its chief members. It attains a thickness of
many thousands of feet, and rises into lofty mountains, some
of which--as the Rigi--are more than 6000 feet in height. The
middle portion of the Molasse is of marine origin, and is shown
by its fossils to be of the age of the Faluns; but the lower
and upper portions of the formation are mainly or entirely of
fresh-water origin. The Lower Molasse (of Lower Miocene age)
has yielded about 500 species of plants, mostly of tropical or
sub-tropical forms. The Upper Molasse has yielded about the same
number of plants, with about 900 species of Insects, such as
wood-eating Beetles Water-beetles, White Ants, Dragon-flies, &c.
In _Belgium_, strata of both Lower and Upper Miocene age are
known,--the former (_Rupelian Clays_) containing numerous marine
fossils; whilst the latter (_Bolderberg Sands_) have yielded
numerous shells corresponding with those of the Faluns.
In _Austria_, Miocene strata are largely developed, marine beds
belonging to both the Lower and Upper division of the formation
occurring extensively in the Vienna basin. The well-known Brown
Coals of Radaboj, in Croatia, with numerous plants and insects,
are also of Lower Miocene age.
In _Germany_, deposits belonging to both the Lower and Upper
division of the Miocene formation are extensively developed.
To the former belong the marine strata of the Mayence basin,
and the marine _Rupelian Clay_ near Berlin; whilst a celebrated
group of strata belonging to the Upper Miocene occurs near
Epplesheim, in Hesse-Darmstadt, and is well known for the number
of its Mammalian remains.
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