| 单词 | st louis group |
| 释义 | > as lemmasSt. Louis group St. Louis group n. a section of the mountain limestone of North America, well developed in states bordering on the upper Mississippi. ΚΠ 1863 J. D. Dana Man. Geol. 307 The St. Louis limestone (250 feet thick), overlaid by ferruginous sandstone (200 feet). 1879 Encycl. Brit. X. 350/2 St. Louis group.—Limestones with shale, in places 250 feet. < as lemmas |
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