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ANGIOSPERM
2
BASIN
2
BIOSTRATIGRAPHY
2
BUCHIID BIVALVES
2
Correlation
2
Cretaceous boundary
2
EARLY CRETACEOUS AGE
2
Geology
2
HEILONGJIANG PROVINCE
JIXI GROUPS
2
JURASSIC/CRETACEOUS BOUNDARY
2
Jurassic
2
LONGZHAOGOU
2
Lower Cretaceous
2
MIDDLE
2
Northeastern China
2
Paleontology
2
Sikhote-Alin
2
Stratigraphy
2
Upper Jurassic
2
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