英语词汇“index horizon”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

index horizon n. Geology a horizon distinguished by certain groups of fossils found within it, or other characteristics which make it an indicator of a particular stratigraphic position.

ΘΚΠ

the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > organic remains or fossils > horizon or assise

horizon1856

assise1882

index horizon1956

1956 W. Edwards in D. L. Linton Sheffield 13 No marine horizons are known, but a widespread index-horizon with Euestheria, the Low ‘Estheria’ Band, overlies a split-off lower leaf of the Silkstone Coal.

1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles ix. 224 The marine horizons (called marine bands) are sometimes of great lateral extent and act as vitally important index horizons.

单词	index horizon
释义	> as lemmas index horizon index horizon n. Geology a horizon distinguished by certain groups of fossils found within it, or other characteristics which make it an indicator of a particular stratigraphic position. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > stratum by constitution > organic remains or fossils > horizon or assise horizon1856 assise1882 index horizon1956 1956 W. Edwards in D. L. Linton Sheffield 13 No marine horizons are known, but a widespread index-horizon with Euestheria, the Low ‘Estheria’ Band, overlies a split-off lower leaf of the Silkstone Coal. 1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles ix. 224 The marine horizons (called marine bands) are sometimes of great lateral extent and act as vitally important index horizons. extracted from indexn. < as lemmas
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> as lemmas