earth pillar

earth pillar

noun Geology.
a pillar of earthy matter left by erosion of the surrounding ground.

Origin:
1865–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Earth pillar is always a great word to know.
So is horizon. Does it mean:
single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition
thin, distinctive stratum useful for stratigraphic correlation
Collins
World English Dictionary
earth pillar
 
n
a landform consisting of a column of clay or earth capped and protected from erosion by a boulder

Collins English Dictionary - Complete & Unabridged 10th Edition
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