Thin layers of sandy shale, and carbonaceous fragments are locally present.局部出现砂质页岩薄层和碳质碎屑.This sandstone unit is commonly thick - bedded and massive, with silty and carbonaceous laminations.该砂层单元通常为厚层或块状, 具粉砂质和碳质纹层.Beca...
This sandstone unit is commonly thick - bedded and massive, with silty and carbonaceous laminations.该砂层单元通常为厚层或块状, 具粉砂质和碳质纹层.Thin layers of sandy shale, and carbonaceous fragments are locally present.局部出现砂质页岩薄层和碳质碎屑.Beca...