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Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. [1] [2] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition.
Soil: Very sandy – Soil mix of 40% vegetative matter, 30% red lava sand, and 30% river sand. Perlite can be added to the mix as needed and provides faster growing in flats and pots. Makes a flat, very drought tolerant ground cover and good lawn replacement in dry zones. Takes medium foot traffic and often called living cement.
The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...
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The rocks containing Cretaceous fossils are exposed only in small areas lying directly over the Protho and Rayburn salt domes in northwest Louisiana where they have been displaced from deep in the subsurface. [1] Otherwise Cretaceous and older strata lie deeply buried beneath younger Cenozoic sediments where their fossils are inaccessible.
Vast areas of trap rock in the form of thick lava flows and other volcanic rocks comprise the Deccan Traps of India and Siberian Traps of Russia. [6] Other prominent basalt ridges, mountains, buttes, canyons, and other landscape features include: In North America: The ridges and cliffs of the Columbia River Gorge in Oregon and Washington.