Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Containing magnesium and iron and only a very small amount of silica. Used of igneous rock.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. ultramafic

from The Century Dictionary and Cyclopedia

  • In petrography, extremely rich in the base-forming elements and poor in silica: applied by Judd (1881) to peridotites, hornblendites, limburgites, and related igneous rocks.

Etymologies

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Examples

  • The higher elevations of the Nicobars often contain serpentine and gabbro formations, whereas at lower elevations Eocene sediments (sandstones, shales, and siltstones) with ultrabasic igneous intrusions predominate.

    Nicobar Islands rain forests

  • Metamorphic schist, limestone, ultrabasic rocks, and volcanic rocks are the main parent rock formations of the ecoregion.

    Aegean and Western Turkey sclerophyllous and mixed forests

  • This ecoregion also contains patches of ultrabasic rocks.

    Seram rain forests

  • Mesozoic dolomite and limestone predominate; other important substrates are sandstone and marl, the oldest crystalline metamorphic (i.e. quartzite and schist), and ultrabasic serpentines (Smolikas range).

    Pindus Mountains mixed forests

  • Goodenough, Fergusson, and Normanby islands consist mainly of lowland rain forest on acid soil; however, Normanby has one area of ultrabasic soils.

    Trobriand Islands rain forests

  • The ultrabasic soils of Normanby have turned up exciting new finds, including two endemic ant-plant species.

    Trobriand Islands rain forests

  • Grande Terre island is one of the most biodiverse islands for this taxonomic group, with species found only in ultrabasic substrata and others only in some short, oxygenated rivers of the north.

    Biological diversity in New Caledonia

  • This rich biodiversity and high endemism are due to its long-isolated evolution, as well as the variety of precipitation levels and very particular ultrabasic soils that cover more than one third of the country.

    Biological diversity in New Caledonia

  • East and West Sulawesi collided approximately 13-19 million years ago, and ultrabasic rocks were exposed as East Sulawesi overrode the western portion.

    Sulawesi montane rain forests

  • The higher elevations of the Andamans often contain serpentine and gabbro formations, and at lower elevations Eocene sediments (sandstones, shales, and siltstones) with ultrabasic igneous intrusions predominate.

    Andaman Islands rain forests

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