Dictionary

sub-outcrop en · NOUN

Etymology

From sub- + outcrop.

Meanings

1. A rock stratum that was once exposed at an ancient erosion surface and unconformably underlies another rock stratum.
   • Another interpretation is that the moraine cover is considerably thinner at the anomaly centre than at the drillhole sites so that the sub-outcrop of the ore actually occurs north of the position in which it is shown in Fig.50. 1966, D.S. Parasnis, Mining Geophysics, page 147:
   • The sub-outcrop on the northern part of Rietfontein No. 4 and Benoni No. 3 is fixed by several bore-holes and by mine workings. 1924, Mining Publications (publisher), The Mining Magazine, Volumes 30-31, page 372:
   • This great abundance of surficial silica deposited in the five chalcedonic sinter terraces indicates that extensive sub-outcrop volumes of the Palm Springs formation and the Canebrake conglomerate have been saturated, soaked, and replaced by silica, thereby forming key gold target areas in Sections 20 and 30. 1991, Stephen A. Manydeeds, Bruce D. Smith, Mineral Frontiers on Indian Lands:
   • Certain pellets are very homogeneous in appearance, with practically no endogangue; grains of this type are frequently contained in sub-outcrop strata. 1986, Maurice Slansky, Geology of Sedimentary Phosphates, page 50:
   • Beyond the eastern limit the outcrop dips below the Black Reef and Dolomite formations; but the sub-outcrop, sweeping round and striking south-east, has been traced by bore-holes for another ten or twelve miles. 1917, Cuthbert Baring Horwood, The Gold Deposits of the Rand, page 160:
   • Subsequently, a low-altitude airborne geophysical survey was flown over the whole area, and the results were useful in determining the extent and structure of the carbonatite sub-outcrop. 2015, Wolfgang Derek Maier, Raimo Lahtinen, Hugh O'Brien, Mineral Deposits of Finland, page 28:
   • The government of Mali interprets artisanal mining as operations engaged in the extraction and beneficiation of mineral commodities sourced from primary and secondary deposits, outcrops or sub-outcrops, using manual methods and traditional processes. 2006, Gavin M. Hilson (editor), Small-scale Mining, Rural Subsistence and Poverty in West Africa, page 108:

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