Topic
Hokkaido
Yezo Group
3
planktonic foraminifera
Cenomanian
2
Cretaceous
2
Hobetsu
2
Turonian
2
"Orbitolina-Praecaprotina limestone"
1
456
1
Early Cretaceous
1
Helvetoglobotruncana
1
Helvetoglobotruncana helvetica
1
bio-stratigraphy
1
biostratigraphy
1
biostratigraphy carbon
1
carbon isotope
1
helvetica
1
isotope
1
olistostrome
1