短語詞組短語reverse graded bedding 反序粒層理content graded bedding 含量遞變層理double graded bedding 雙重粒級(jí)層biogenic graded bedding 生物粒級(jí)層;[古生]生物遞變層理rhythmic graded bedding 韻律性遞變層理reversely -graded bedding 倒轉(zhuǎn)分級(jí)層 返回 graded bedding