The succession of vertebrates and plants across the Cretaceous - Tertiary boundary in the Tremp Formation, Ager Valley (south-central Pyrenees, Spain.).
Reference:
Martnez-HernЎndez,N. et al. (1999)
The succession of vertebrates and plants across the Cretaceous - Tertiary boundary in the Tremp Formation, Ager Valley (south-central Pyrenees, Spain.). Geobios
Vol. 32 # 4 P. 617- 627