Breccias sentence example

breccias
  • East of Bolsover, the Coal Measures are covered uncomformably by the Permian breccias and magnesian limestone.

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  • East of Bolsover, the Coal Measures are covered unconformably by the Permian breccias and magnesian limestone.

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  • They consist of breccias, conglomerates, sandstones, marls, and limestones, with seams of coal and lignite.

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  • It is only in the more northerly part of the country that the pipes are filled with blue ground (or " kimberlite "), and that they are diamantiferous; but over a great part of Cape Colony have been discovered what are probably similar pipes filled with agglomerates, breccias and tuffs, and some with basic lavas; one, in particular, in the Riversdale Division near the southern coast, being occupied by a melilite-basalt.

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  • There occur also below the Lias on some parts of the west coast unfossiliferous red sandstones, conglomerates and breccias, presenting lithological resemblance to the Rhaetic group of England.

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  • These are overlaid by sandstones, slates and limestones, alternating with porphyries and porphyrites, sometimes in the form of sheets, sometimes as breccias and conglomerates.

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  • These are overlain, perhaps unconformably, by a great thickness of lavas and volcanic breccias (Pniel volcanic series, Beer Vley and Zeekoe Baard amygdaloids), and these in turn by the quartzites, grits and shales of the Black Reef series.

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  • The Ongeluk volcanic series, consisting of lavas and breccias, conformably overlies the Griquatown series; while the grits, quartzites and conglomerates of the Matsap series rest on them with a great discordance.

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  • The principal varieties are basalt and palagonitic breccias, the former covering two-thirds of the entire area, the latter the remaining one-third.

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  • The palagonitic breccias, which stretch in an irregular belt across the island, are younger than the basalt.

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  • The palagonitic breccias, which attain their greatest development in the south of the island and on the tableland, consist of reddish, brown or yellowish rocks, tuffs and breccias, belonging to several different groups or divisions, the youngest of which seems to be of a date subsequent to the Glacial epoch.

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  • In the middle of Iceland, where the geological foundation is tuff and breccias, large areas are buried under ancient outflows of lava, which bear evidences of glacial scratching.

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  • Both methods become difficult to implement if large boulders have to be propped up or if explosives have to be used on indurated breccias.

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  • A priori, one would guess that bone in some uncemented breccias will have witnessed the passage of only small amounts of water.

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  • The rock lies close to the others which are more clearly limestone breccias and it acts as a reasonable marker horizon.

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  • In geology, the cement of breccias and conglomerates is usually silica, iron oxides or calcite (mineral calcium carbonate ).

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  • For caverns that contain breccias and speleothems, the excavation and mapping has to take into account the vagaries of speleothem deposition.

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  • The other rocks include igneous breccias, shales, coarse conglomerates and grits.

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  • Seasonal inflow may, for example, winnow out sediments from breccias and other areas, to redeposit them elsewhere.

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