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

marker bed n. Geology (a) a layer of sedimentary rock possessing distinctive characteristics (esp. fossils) which enable it to be recognized over a large area; (b) a sedimentary stratum that accounts for a characteristic seismic refraction time–distance curve.

ΚΠ

1956 Nature 21 Jan. 120/2 In areas where deep weathering or drift presents difficult low-velocity-layer correction problems, the reflexion times down to a known shallow marker-bed will give the necessary corrections for the deeper horizons.

1965 G. J. Williams Econ. Geol. N.Z. iv. 36/1 A recognisable marker-bed which could possibly be mapped over a considerable distance.

1989 Encycl. Brit. VII. 858/2 The term marker bed is also applied to sedimentary strata that provide distinctive seismic reflections.

1990 P. Kearey & F. J. Vine Global Tectonics iii. 47 Marker beds of tillite and coal, and sediments containing Glossopteris and Gangamopteris flora..can be correlated through South America, South Africa, Antarctica, India and Australia.

单词	marker bed
释义	> as lemmas marker bed marker bed n. Geology (a) a layer of sedimentary rock possessing distinctive characteristics (esp. fossils) which enable it to be recognized over a large area; (b) a sedimentary stratum that accounts for a characteristic seismic refraction time–distance curve. ΚΠ 1956 Nature 21 Jan. 120/2 In areas where deep weathering or drift presents difficult low-velocity-layer correction problems, the reflexion times down to a known shallow marker-bed will give the necessary corrections for the deeper horizons. 1965 G. J. Williams Econ. Geol. N.Z. iv. 36/1 A recognisable marker-bed which could possibly be mapped over a considerable distance. 1989 Encycl. Brit. VII. 858/2 The term marker bed is also applied to sedimentary strata that provide distinctive seismic reflections. 1990 P. Kearey & F. J. Vine Global Tectonics iii. 47 Marker beds of tillite and coal, and sediments containing Glossopteris and Gangamopteris flora..can be correlated through South America, South Africa, Antarctica, India and Australia. extracted from markern. < as lemmas
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> as lemmas