Rocks of the Green River Formation contain a story of what the environment was like about 50 million years ago in what is now parts of Colorado, Utah and Wyoming。 2个what引导的句子做啥成分呢
a story of what 从句 充当主句的宾语。 两个what引导的名词从句，充当介词宾语，即介宾结构。 第一个what 从句中，the environment was like (what) about 50 million years ago.....，修饰story. 第二个in what is now parts of colorado, utah, and wyoming, 这里的what可以理解成缩合关系词，the place that. in +what从句介宾结构相当于介词短语指明地点。与about 50 million years ago（指明时间）并列修饰第一个what. a story of what从句整个意思是：5000万年前，部分位于现在的三个州（略）地区的环境状况。
主语：Rocks of the Green River Formation （Green River的岩层的形成） 谓语： contain 包括，包含 宾语： a storyof what the environment was like about 50 million years ago in what is now parts of Colorado, Utah and Wyoming。
what the environment was like about 50 million years ago做介词of 的宾语 what is now parts of Colorado, Utah and Wyoming做介词in的宾语