| 单词 | grand canyon |
| 释义 | > as lemmasGrand Canyon Grand Canyon n. [ < the name of the gorge of the Colorado River in Arizona, U.S.A.] Geology the system of (chiefly sedimentary) rocks exposed in the Grand Canyon, Arizona; spec. (in later use) a series of strata laid down between about 1250 and 700 million years ago; usually attributive, designating these formations and things connected with them. ΚΠ 1875 Rep. Geogr. & Geol. Surv. West 100th Meridian (Engineer Dept., U.S. Army) III. i. vi. 186 The Grand Cañon rock system. 1876 J. W. Powell Rep. Geol. Eastern Portion Uinta Mount. 70 Fossils have been found at the base of the Grand Cañon series... Red Creek Quartzite and Grand Cañon schists..are believed to be Eozoic. 1925 J. Joly Surface-hist. Earth viii. 131 Many authorities would recognize in pre-Cambrian times not one but three great revolutions as having occurred.., the third (the Killarney or Grand Canyon) closing pre-Cambrian time. 1952 W. J. Miller Introd. Hist. Geol. (ed. 6) x. 95 The Grand Canyon system must have been uplifted, tilted, and faulted, with production of block mountains, and then eroded to a condition of low relief, before submergence under the Cambrian sea. 2011 J. P. Rafferty Geochronol., Dating & Precambrian Time 220 The Grand Canyon Series is a major division of rocks in northern Arizona that dates from Precambrian time. < as lemmas |
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