Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A dark, fine-grained igneous rock; diabase.
from The Century Dictionary.
- noun A name given by Haüy to a rock of the basalt family, called by some a basaltic greenstone, the deception implied in the name referring to the difficulty of distinguishing the rock from other varieties also designated as greenstone.
from the GNU version of the Collaborative International Dictionary of English.
- noun A dark, crystalline, igneous rock, chiefly pyroxene with labradorite.
- noun Coarse-grained basalt.
- noun Diabase.
- noun Any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology A fine-grained
basaltic rock
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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A dramatic period of igneous activity followed the deposition of these sediments in the Jurassic, with the injection of massive amounts of dolerite into the Parmeener Supergroup.
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Due to its resistant nature dolerite covers a vast tract of the WHA.
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Although still infertile by world standards, soils here are generally higher in nutrient content than those in western Tasmania, especially the rich soils on dolerite substrate.
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The Western Mountain Karoo forms part of the Great Escarpment, a mountainous landscape comprising mainly of Karoo rocks with dolerite intrusions forming many of the peaks and ridges.
Succulent Karoo 2008
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Areas of lower elevation largely consist of post Carboniferous sediments overlying a basement of Cambrian rocks, with significant intrusions of Jurassic dolerite.
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The rocks of Hirta are predominantly a complex of dolerite and microgranites with gabbro along the castellated west coast, intruded by basalt dykes.
St Kilda (Hirta) National Nature Reserve, United Kingdom 2008
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The Karoo dolerite dykes and sills were formed when molten rock intruded into the pre-existing rocks of the Ecca and Beaufort shales.
Nama Karoo 2008
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In addition, the rain forests are restricted to dolerite-derived red clay soils, which are highly moisture retentive.
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Sandstone and shale from the Karoo sequence, together with dolerite intrusions, characterize the geology.
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The forests of the Amatole Mountains occur further east and inland, at 32. 7° south and 27. 2° east, where shale, sandstone, mudstone, and dolerite are the main geological elements.
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