TY  - RPRT
TI  - Palynologically calibrated vertebrate record from North Dakota consistent with abrupt dinosaur extinction at the Cretaceous-Tertiary boundary
AU  - D.A. Pearson
AU  - T. Schaefer
AU  - K.R. Johnson
AU  - D. J. Nichols
PY  - 2001
DO  - 10.1130/0091-7613(2001)029<0039:pcvrfn>2.0.co;2
UR  - https://pubs.usgs.gov/publication/70023697
ID  - 70023697
ER  -