3.1.1 Strata stratigraphy Strata: All layered rocks which include all sedimentary rocks. a layered part of igneous rocks and metamorphic rocks 地层:各种层状岩石的统称. 包括所有的沉积岩,部分火成 岩和变质岩 (ICS,1994)3.1.1 Strata & stratigraphy Strata: All layered rocks, which include all sedimentary rocks, a part of igneous rocks and metamorphic rocks 地层:各种层状岩石的统称. 包括所有的沉积岩,部分火成 岩和变质岩. layered (ICS,1994)