石炭-二叠纪煤系
Carboniferous and Permian coal bed
石炭—二叠系煤系
Permo-Carboniferous coal measure
石炭系—二叠系
Permian-Carboniferous period
carboniferous-permian
permian-carboniferous
石炭二叠纪
carboniferous permian
permo-carberniferous
Permo-carboniferous period
permo-carboniferous
石炭－二叠纪
carboniferous-permian
Carboniferous to Permian
Carboniferous and Permian
石炭—二叠纪
Permo-carboniferous period
carboniferous-permian
permo_carboniferous
permo-carboniferous
Yuanshi mining area
石炭－二叠纪裂谷
Carboniferous-Permian rift
石炭二叠系
permo Carboniferous
Permo-carboniferous system
Carboniferous and Permian
permo-carboniferous
石炭－二叠系
the Permo-Carboniferous
carboniferous period—permian period
Pero-carboniferous system
permo-carbonniferous
carboniferous-permiansystems
Carboniferous-Permian coal sequence
Carboniferous-Permian deposits
carboniferous-permian
permo-carboniferous
Permo-carboniferous system
石炭—二叠系
Carboniferous-Permian formation
conodont biostratigraphy
Permo-carboniferous system
Carboniferous-Permian coal sequence
Carboniferous and Permian
carboniferous-permian
permo-carboniferous
石炭－二叠系界线
Carboniferous-Permian boundary
泥盆纪-石炭纪
Devonian-Carboniferous period
devonian-carboniferous
泥盆系—石炭系界线
Devonian-Carboniferous boundary
泥盆系——石炭系界线
Devonian-Carboniferous boundary