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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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).