attritus


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attritus

[ə′trīd·əs]
(geology)
Visible-to-ultramicroscopic particles of vegetable matter produced by microscopic and other organisms in vegetable deposits, particularly in swamps and bogs.
The dull gray to nearly black, frequently striped portion of material that makes up the bulk of some coals and alternate bands of bright anthraxylon in well-banded coals.
References in periodicals archive ?
Cinco especies solo fueron observadas en Agua Dulce (Anas platyrhynchos, Branta bernicla, Gavia immer, Melanitta perspicillata, Podiceps attritus y Podiceps nigricollis) y cinco en El Ermitano (Anas penelope, Anas strepera, Dendrocygna bicolor, Porphyrula martinica y Tachybaptus dominicus).
Vere novo, gelidus canis cum montibus umor liquitur et Zephyro putris se glaeba resolvit, depresso incipiat iam tum mihi taurus aratro ingemere et sulco attritus splendescere vomer.