TY  - RPRT
TI  - Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA
AU  - D.R. Grocke
AU  - Greg A. Ludvigson
AU  - B.L. Witzke
AU  - S.A. Robinson
AU  - R. M. Joeckel
AU  - David F. Ufnar
AU  - R.L. Ravn
PY  - 2006
DO  - 10.1130/g21998.1
UR  - https://pubs.usgs.gov/publication/70030655
ID  - 70030655
ER  -