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truncated spur
A truncated spur is a spur, which is a ridge that descends towards a valley floor or coastline from a higher elevation, that ends in an inverted-V face and was produced by the erosional truncation of the spur by the action of either streams, waves, or glaciers. Truncated spurs can be found within mountains, along the walls of river valleys, or along coastlines.〔Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. ISBN 0-922152-76-4〕〔Thornbury, W. D., 1954, ''Principles of Geomorphology.'' John Wiley and Sons, Inc. New York. 618 pp. ISBN 978-8123908113〕
A faceted spur is also a spur that ends in a triangular face, known as a triangular facet, with a broad base and an apex pointing upward. As typically used in geology, the triangular facet is usually a remnant of a fault plane and it and its associated faceted spur are the result of faulting. The term ''faceted spur'' is also applied to inverted-V rock faces formed by stream, wave, or glacial erosion and, thus, as a synonym for ''truncated spur''.〔〔
==Formation==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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