“key bed”的概念、定义、翻译、参考文献-科学参考

单词	key bed
释义	key bed [`kē ´bed] ^GEOLOGY 1. Also known as index bed; key horizon; marker bed. 2. A stratum or body of strata that has distinctive characteristics so that it can be easily identified. 3. A bed whose top or bottom is employed as a datum in the drawing of structure contour maps.
随便看	Ischnacanthiformes I scope ISDN Isectolophidae isenergic flow isenthalpic expansion isenthalpic process isentrope isentropic isentropic chart isentropic compression isentropic condensation level isentropic expansion isentropic flow isentropic map isentropic mixing isentropic process isentropic surface isentropic thickness chart isentropic weight chart isethionic acid ISFET ishikawaite ishkyldite I signal

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