Topic
Cenomanian
3
planktonic foraminifera
Cretaceous
2
Hobetsu
2
Hokkaido
2
Turonian
2
Yezo Group
2
Helvetoglobotruncana
1
Helvetoglobotruncana helvetica
1
Oceanic Anoxic Event (OAE)
1
Oyubari section
1
Pueblo section
1
T) boundary
1
Turonian(C
1
Whiteinella archaeocretacea Zone
1
bio-stratigraphy
1
biostratigraphy carbon
1
carbon isotope
1
helvetica
1
isotope
1
σ^<13>C spike
1