398 



W. D. MATTHEAV THE CRETACEOUS-TERTIARY PROBLEM 



C R E T A C I C 



TERTIARY 



OR 



C R E T A C I 



T E R T . 



FcLunal Break 

 due to migration 



\f WASATCH 



Fa unal Break 

 due toJTiiara tio ix 

 and change of fades 



K 



UERCO-TORREJON 



NEO-PLACENTAL 

 MAMMALS 



No Faunal Bredh hert 



I 



BELLY R/VER 



TRITUBERCULATES 



LANCE 



MULTITUBERCULATE 

 MAMMALS 



Dl NOS AURS 



[CeratopsianS , Tracho- 

 donts , Ank^losciurSy Jg. 

 uanodonCs ^Deinodonts^ 

 Orniihomimids etc.) 



CHfl\MPSOSAURS 



TRITUBERCULATE 



(? MARSUPIAL) 

 COAPIMAInS 



MULTITUBERCULATE 

 MAMMALS 



DINOSAURS 



(Ceratop^ians , Tracho 

 donts f AnftylosAurs , Iq 

 uanodoncsj Deinodonts^ 

 Orndhoiniwids etc.) 



CHAMPS05AURS 



pal/eo-placental 



MAMMALS 



PAL/tO-PLAC£NTAL 

 MAMMALS 



MULTITUBERCULATE 

 MAMMALS 



C H AMPSOSAURS 



CROCODILES 



CROC GDI LES 



C ROCODI L£S 



CROCODILES 



TURTLES 

 (Trio ni/chid<,, Baenids^ 

 Dermatewi/dids) 



TU RTLE S 

 (Trionychids ,Bain id^j 

 2)erma. tei^iydids) 



TURTL ES 



(Trioiii/chids,Baenids, 



Dermatemydids) 



\ 



'nig 



fidvocafed lu 



Know I ton ft al. 



t 



I'ng 



ya 



and Supported, iu 

 Stanton et a.1 ' 



TU RT LE S 

 (Trionyc/tids , Ba'en idsj 

 J)e rmaterri ydids , 

 l^arsh Turtles and 

 Tortoises) 



Bii/iding line 

 Carrentfu aeeephd, 



Dividin 



iin< 



tnq 



Sua yes red iu 

 Cope and //my 



FiGUUE 3. — Division bcticccii ("rrtaccoiix and Tertiar}/ I*rri(nlH. as iniii< >itr<l Inj terrestrial 

 Vertebrate Fannw of typical ucntcrn Format ioni^ 



