Two types of dolomite are observed.One type is stratiform, replaced micrite-rich facies, and is interpreted as early dolomite that recrystallized in hydrothermal brines. The second type crosscuts stratigraphy and depositional facies and has vertically continuous morphologies that trend northwest-southeast. The latter dolomite is interpreted as forming in hydrothermal brines
derived from latest Permian-aged highly evaporated seawater. Lower porosity but much higher permeability.