East of Bolsover, the Coal Measures are covered uncomformably by the Permian breccias and magnesian limestone.
East of Bolsover, the Coal Measures are covered unconformably by the Permian breccias and magnesian limestone.
The material is magnesian limestone.
The material used is a soft, porous magnesian limestone, which is well adapted to the purpose in view.
Ore endowed with this curious property was well known to the ancient Greeks and Romans, who, because it occurred plentifully in the district of Magnesia near the Aegean coast, gave it the name of magnes, or the Magnesian stone.
The Dolomite Series, known to the Dutch as " Olifants Klip," consists of a bluish-grey magnesian limestone with bands of chert.
This variety must certainly be magnesian limestone.
Magnesian limestone mixed and fused with sand and an alkaline carbonate produces a permanent glass.
The actual coal measure strata, consisting mainly of shales and clays, are generally impervious to water, but when strata of a permeable character are sunk through, such as the magnesian limestone of the north of England, the Permian sandstones of the central counties, or the chalk and greensand in the north of France and Westphalia, special methods are required in order to pass the water-bearing beds, and to protect the shaft and workings from the influx of water subsequently.
Some of the earlier sinkings of this kind, when pumps had to be depended on for keeping down the water, were conducted at great cost, as, for instance, at South Hetton, and more recently Ryhope, near Sunderland, through the magnesian limestone of Durham.
Near Gouverneur, St Lawrence county, is a large quarry of coarsely crystalline magnesian limestone, used as monumental marble.
From an extensive deposit of blue-black magnesian limestone at Glens Falls are taken the choicest varieties of black marble quarried in the United States.
Other authors have sought the origin of the diamond in the action of the hydrated magnesian silicates on hydrocarbons derived from bituminous schists, or in the decomposition of metallic carbides.
He first explored the Odeum and the Great Theatre situate in the city itself, and in the latter place had the good fortune to find an inscription which indicated to him in what direction to search for the Artemision; for it stated that processions came to the city from the temple by the Magnesian gate and returned by the Coressian.
These two gates were next identified, and following up that road which issued from the Magnesian gate, Wood lighted first on a ruin which he believed to be the tomb of Androclus, and afterwards on an angle of the peribolus wall of the time of Augustus.
Angle of the Hellenic Agora towards the Magnesian gate.
Besides these excavated monuments, the Stadion; the enceinte of fortifications erected by Lysimachus, which runs from the tower called the "Prison of St Paul" and right along the crests of the Bulbul (Prion) and Panajir hills; the round monument miscalled the "Tomb of St Luke"; and the Opistholeprian gymnasium near the Magnesian gate, are worthy of attention.
The coal-fields on the eastern side, from the Tyne nearly to the Trent, are sharply marked off on the east by the outcrop of Permian dolomite or Magnesian limestone, which forms a low terrace dipping towards the east under more recent rocks, and in many places giving rise to an escarpment facing westward towards the gentle slope of the Pennine dales.
The centaurs were the offspring of Ixion and Nephele (the rain-cloud), or of Kentauros (the son of these two) and some Magnesian mares or of Apollo acid Hebe.
In the central portion, which belongs to the Triassic formation, magnesian limestone, ferruginous sandstone and gypsum are representative rocks.
Magnesian limestone, or dolomite, is especially plentiful along the Blue, Republican and Neosho rivers and their tributaries.
Lexington was the home of Henry Clay from 1797 until his death in 1852, and in his memory a monument has been erected, consisting of a magnesian-limestone column (about 120 ft.) in the Corinthian style and surmounted by a statue of Clay, the head of which was torn off in 1902 by a thunderbolt.
Where the strata are not uniformly porous, they may resist the passage of water from the direction of the sea or they may assist it; and round the whole coast of England, in the Magnesian limestone to the northeast, in the Chalk and Greensand to the east and south, and in the New Red Sandstone to the west, the number of wells which have been abandoned as sources of potable supply, owing to the percolation of sea water, is very great.