metamorphic rock with approximately the same composition as marl
同义词：marlite
marlstone详细解释
marl.stone n.（名词）A rock containing clay materials and calcium and magnesium carbonates, with approximately the same composition as marl.泥灰岩：一种含粘土物质、钙和镁碳酸盐的岩石，其成分与泥灰土大体一致
