from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Chiefly British A dark, fine-grained igneous rock; diabase.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fine-grained basaltic rock
from the GNU version of the Collaborative International Dictionary of English
- n. A dark, crystalline, igneous rock, chiefly pyroxene with labradorite.
- n. Coarse-grained basalt.
- n. Diabase.
- n. Any dark, igneous rock composed chiefly of silicates of iron and magnesium with some feldspar.
from The Century Dictionary and Cyclopedia
- n. 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.
In addition, the rain forests are restricted to dolerite-derived red clay soils, which are highly moisture retentive.
The Karoo dolerite dykes and sills were formed when molten rock intruded into the pre-existing rocks of the Ecca and Beaufort shales.
Sandstone and shale from the Karoo sequence, together with dolerite intrusions, characterize the geology.
The rocks of Hirta are predominantly a complex of dolerite and microgranites with gabbro along the castellated west coast, intruded by basalt dykes.
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.
Areas of lower elevation largely consist of post Carboniferous sediments overlying a basement of Cambrian rocks, with significant intrusions of Jurassic dolerite.
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.
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.
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.
Due to its resistant nature dolerite covers a vast tract of the WHA.
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