上元古界—下古生界
upper-proterozoic-lower-paleozoic
下古生界
the Lower Palaeozoic Erathem
bitumen C
exploration
lower paleozoic
paleozoic
lower Palaeozoic
the Lower Paleozoic
lower-palaeozoic
下古生界气藏
Lower Paleozoic gas reservoir
下古生界潜山
Lower Paleozoic buried hill
震旦系－下古生界
Sinian system-lower Paleozoic
sinian-lower palaeozoic
sinian-lower paleozoic
塔河下游
lower reaches of Tarim River
古生界的厘定
determination of the Paleozoic
古生界盐构造
Paleozoic salt structures