Carboniferous and Permian

Carboniferous and Permian coal bed

Carboniferous Period—Permian Period

Carboniferous Permian

Carboniferous to Permian

Carboniferous-Early Permian rift-related volcanic

distortion of Permian sedimentary facies zone

early Late Permian

Early Permian

Early Permian Epoch

early stage of early Permian

Early-Middle Permian

Late Carboniferous to Early Permian

Late Carboniferous-early Early Permian

late Early Permian

Late Middle Permian

late Permian

Late Permian coal

Late Permian Epoch

late Permian Period