A gradual refrigeration proceeded through the Pliocene period.
On the other hand, in the short-chinned mastodons, as represented by the Pleistocene North American Mastodon americanus and the Pliocene European M.
The Miocene and Pliocene are absent.
Mtich of Italy contains Pliocene clay, which is good for pottery and brickmaking.
At the close of the Pliocene the European flora was apparently little different from that now existing, though some warmer types such as the waterchestnut (Trapa natans) had a more northern extension.
The Pliocene flora found refuges in favored localities from which at its close the lowlands were restocked while the arctic plants were left behind on the mountains.
Pliocene remains are less numerous than those of the Miocene.
Struthio, ostrich, Pliocene of Samos and of north-west India, now Africa and Arabia.
Mesembriornis, Miocene or Pliocene of Argentina.
Hypselornis, Pliocene of Sivalik Hills.
Lake Balkash, or Denghiz, Lake Ala-kul (which was connected with Balkash in the post-Pliocene period, but now stands some hundred feet higher, and is connected by a chain of smaller lakes with Sissyk-kul), Lake Issyk-kul and the alpine lakes of Son-kul and Chatyr-kul are the principal sheets of water.
Recently emerged from the Post-Pliocene sea, or freed from their mantle of ice, they persistently maintain the self-same features over immense areas; and the few portions that rise above the general elevation have more the character of broad and gentle swellings than of mountain-chains.
This desert is now filled to only a small extent by the salt waters of the Caspian, Aral and Balkash inland seas; but it bears unmistakable traces of having been during Post-Pliocene times an immense inland basin.
The Pliocene appears only in the coast region of the Black and Azov Seas, but it is widely developed in the Aral-Caspian region, where, however, the Ust-Urt and the Obshchiy Syrt rose above the sea.
The thick Quaternary, or Post-Pliocene, deposits which cover nearly all Russia were for a long time a puzzle to geologists.
It has the Black Sea and Caucasia, being separated from the latter by the Manych depression, which in Post-Pliocene times connected the Sea of Azov with the Caspian.
This depression is supposed to be a relic of the former post-Pliocene connexion between the Black Sea and the Caspian, and is accepted by most geographers as the natural frontier between Europe and Asia, while others make the dividing-line coincide with the principal water-parting of the Caucasus mountain system.
The Pliocene deposits are not very widely spread and are generally of fresh-water origin excepting near the coast, but marine Pliocene beds have been found at el Forklus in the Palmyra desert.
In most cases the eruptions appear to be of Pliocene or later date, but in the extreme north some of the basalt seems to belong to the Miocene period.
Apparently the musk-ox (Ovibos moschatus) has little or no near relationship to either the oxen or the sheep; and it is not improbable that its affinities are with the Asiatic takin (Budorcas) and the extinct European Criotherium of the Pliocene of Samos.
In North America rhinoceroses became extinct before the close of the Pliocene period; but in the Old World, although their geographical distribution has become greatly restricted, at least five well-marked species survive.
Hornless rhinoceroses, with five fronttoes, ranging from the Oligocene to the Lower Pliocene in Europe, represent the genus Aceratherium, which may also occur in America, as it certainly does in India.
With the short-skulled, short-footed, three-toed and generally horned rhinoceroses ranging in Europe and America from the Lower Miocene to the Lower Pliocene, typified by the European R.
Sansaniensis and in the Indian Pliocene by R.
Sondaicus, and the Lower Pliocene Indian R.
This vast tract, which is only a few dozen feet above the sea, and most probably was covered by the Northern sea during the Post-Pliocene period, stretches from the lowlands.
All the valleys and depressions bear traces of immense post-Pliocene lakes.
The Pliocene, on the other hand, is of freshwater origin, and contains silicified wood and numerous remains of Mammalia.
Above the surrounding Pliocene plain.
The geological formation of the soil belongs to the Quaternary and Pliocene period in its upper strata, and to the Eocene and Cretaceous in the lower.
Jukes-Browne and Harrison ascribe the Scotland beds to the Eocene or Oligocene period, the Oceanic series to the Miocene, the Bissex Hill marls to the Pliocene, and the coral limestones partly to the Pliocene and partly to the Pleistocene.
The greater part of Tunisia is composed of sandstones, marls and loosely stratified deposits belonging to the Pliocene and Quaternary periods.
==Geology== The flat shore of Lough Neagh in the north is due to the thick deposit of pale-coloured clays with lignites, which are probably of Pliocene age, and indicate a reduction of the area of the lake in still later times.
Members of the group have existed in both east and west hemispheres since the beginning of the Miocene period; but in America they all became extinct before the end of the Pliocene period, and in the Old World their distribution has become greatly restricted.
The outbursts began in the later part of the Eocene period, and continued into the Pliocene, outlasting the period of folding.
Although now exclusively African, the family (of which all the representatives may be included in the single genus Hippopotamus, with several subgeneric groups) is represented in the Pliocene of Europe and the Lower Pliocene of northern India.
On the other hand, in Merycopotamus, of the Lower Pliocene of India and Burma, the upper molars have lost the fifth intermediate cusp of Ancodon; and thus, although highly selenodont, might be easily modified, by a kind of retrograde development, into the trefoil-columned molars of Hippopotamus.
Finally, we have in the Pliocene of India the genus Tetraconodon, remarkable for the enormous size attained by the bluntly conical premolars; as the molars are purely bunodont, this genus seems to be a late and specialized survivor of a primitive type..
An antelope from the Lower Pliocene of Northern India known as Bubalis, or Damaliscus, palaeindicus indicates the occurrence of the hartebeest group in that country.
Gazelles are common in the Miocene and Pliocene of both Europe and Asia.
Elands and kudus appear to have been represented in India during the Pliocene; the European Palaeoreas of the same age seems to be intermediate between the two, while Protragelaphus is evidently another European representative of the group. Helicophora is another spiral-horned European Pliocene antelope, but of somewhat doubtful affinity; the same being the case with the large Criotherium of the Samos Pliocene, in which the short horns are curiously twisted.
Of the Lower Pliocene of Greece, at one time regarded as antelopes,, are now known to be ancestors of the okapi.
There is no proof of their having lived in the Oligocene epoch, but in deposits of Miocene and Pliocene date remains undistinguishable generically and perhaps specifically from the modern tapirs (though named priscus, T.
At the base of the Red Crag in East Anglia, and occasionally at the base of the other Pliocene Crags, there is a " nodule bed," consisting of phosphatic nodules, with rolled teeth and bones, which were formerly worked as " coprolites " for the preparation of artificial manure.
Post-Pliocene "Aral-Caspian deposits," containing the usual fossils (Hydrobia, Neritina, eight species of Cardium, two of Dreissena, three of Adacna and Lithoglyphus caspius), attain thicknesses varying from 105 ft.
Suess therefore suggested that the northern continuation of the Alps had foundered, and its summits been buried beneath the Pliocene marine rocks of the Wanganui basin and the volcanic rocks of the Taupo area.
The Cainozoic system is represented by Oligocene, Miocene, Pliocene and Pleistocene beds.
Marine beds of the Pliocene are best developed in the Wanganui basin.
Fossil remains of extinct bears first occur in strata of the Pliocene age.
Faulting, probably in Pliocene times, lowered the basaltic plateaus to form the basin of Lough Neagh, leaving the eastern scarp at heights ranging up to 1800 ft.
Pliocene beds also occur.
To the Pliocene period the marine deposits of the Sahel of Algiers and of the Sahel Jijelli must be attributed; also the lacustrine marls and limestone of the basin of Constantine, and the ancient alluviums of the basins and depressions which bear no relation to the existing valleys.
Among the Tertiary volcanic rocks those of acid types (granites, granulites) were the first to appear and are developed latitudinally; rocks of intermediate type (dacites, andesites) characterize the Miocene and early Pliocene periods; while the basic rocks (ophites, elaeolite syenites and basalts) attained their maximum in later Pliocene and Quaternary times.
De Blainville added to the knowledge of the shells of the Paris basin; Giovanni Battista Brocchi (1772-1826) in 1814, and Luigi Bellardi (1818-1889) and Giovanni Michelotti (born 1812) in 1840, described the Pliocene molluscs of the subApennine formation of Italy; from Germany and Austria appeared the epoch-making works of Heinrich Ernst Beyrich (1815-1896) and of Moritz Hoernes (1815-1868).
Paul similarly demonstrated genetic series of Paludina (Vivipara) in the Pliocene lakes of Slavonia (1875).
Among land animals striking illustrations of this local polyphyletic law are found in the existence of seven or eight contemporary series of rhinoceroses, five or six contemporary series of horses, and an equally numerous contemporary series of American Miocene and Pliocene camels; in short, the polyphyletic condition is the rule rather than the exception.
It is displayed to-day among the antelopes and to a limited degree among the zebras and rhinoceroses of Africa, a continent which exhibits a survival of the Miocene and Pliocene conditions of the northern hemisphere.
In the Miocene period andesites of various kinds were erupted, while at the close of the Pliocene began the great eruptions of basalt which reached their maximum in Quaternary times and continue to the present day.'
The short-horned Asiatic goats of the genus Hemitragus receive mention in the article Tahr; but it may be added that fossil species of the same genus are known from the Lower Pliocene formations of India, which have also yielded remains of a goat allied to the markhor of the Himalayas.
The Pliocene system stands in much the same stratigraphic relation to the Miocene as the Miocene does to the Eocene.
The marine Pliocene has but trifling development on the Atlantic Piior~ne coast north of Florida, and somewhat more extensive System.
The marine Pliocene of the continent has its greatest development in California (the Merced series, peninsula of San Francisco), where it is assigned a maximum thickness of nearly 6000 ft., and possibly as much as 13,000 ft.