red beds短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 红沙岩床层 In South Tibet, beside the black shales that have been approved the results of OAE in Cretaceous, the overlying oceanic red beds deposited in high- oxidized circumstances have been discovered. 我国西藏南部在已证实的白垩纪大洋缺氧事件形成的黑色页岩基础上，又进一步发现了位于其上的大洋富氧事件产物-大洋红层。 cnki