模板:DailyGREWord/20070409

• Shale
• 红宝: n.页岩 ( a stratified fissile rock)
• 蓝宝: n. 页岩,泥板岩
• Webster: a fissile rock that is formed by the consolidation of clay, mud, or silt, has a finely stratified or laminated structure, and is composed of minerals essentially unaltered since deposition