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单词 basal conglomerate
释义 basal conglomerate
[`bā·sǝl kǝn`gläm·ǝ·rǝt]
GEOLOGY
A coarse gravelly sandstone or conglomerate forming the lowest member of a series of related strata which lie unconformably on older rocks; records the encroachment of the seabeach on dry land.
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