236 



TEN YEARS PROGRESS IN VERTEBRATE PALEONTOLOGY 



been established in American work and promise to set new standards for 

 foreign work (see Matthew, 1909,' Osborn, 1907).^ These standards have 

 been developed independently, but are qnite similar to those long in use 

 by invertebrate paleontologists. The subdivision of the old units into 



-Eotitanops No. /4867, sku// 



^etlOns 



g^sf^s ; ^-^=r^^^'^< — Eotitanops ^i"egoryi) No. /^-dSQ 

 Banded red ^-^ 



and 0ray shales^ ^ . ,I«X^ 



^=^i=i=4^^^^<- £ot/ tanops No. /4894- /4-900 



— and clays \ ^ Lambdotherium 1/4904 



\J4902 



U^9/4 



Red stratum on Alkali Zre^!f^^ i^Eotitannn.'i 



14888 



— ==^ ^Lambdother/umV'^f^^ 



\J4897 



/49/6 



(Pelycodus 

 Notharctus 

 Anaptomorphus 

 Shoshonius 

 Micros/ops 

 D/d/mict/s 

 l^/i/errawc/s 

 Miac/s 

 yu/pav^us 

 Si'nopa 

 Hapa/odectes 

 Pa/asos/nopa 

 \ Par/ctops 

 Pa/ae/ctops 

 ./iyopsodus 

 ? Metache/romys 

 [Sc/uravus 

 \Paramys 

 \£sthonyx 

 {Ca/amodon 

 { Tr/gono/estes 



I//yrachyus 

 Meptodon 

 £oh/ppus 

 £ot/tanops 

 Lambdother/'um- 

 [Phenacodus 

 \Men/scother/um- 

 [Bathyops/s 

 \Coryp/iodon 



Typical Wind River mammals 

 absent or unrecorded inthiszone 



Lambdother/'um 



Eotitanops 



Bathyops/S 



(2). 

 Present in this 

 transition zone 



A II genera common 

 to the Cor-ypTiodoTZ 

 andiLctmbdotTieriitiTL 



zones 



Red stratum on 

 Cottonwood Draw 

 ( Fossils most 

 abundant ) ( 3) 



Typical Wasatch mammals 

 absent or unrecorded inthis zone 



Systemodon 



D/ssacus 



Clasnodon 



MESOZOiC and PALEOZOIC 



Figure ;{. — Qenerulized He<i\un — Tifphal Wind Nicer Series of irestent Wi/omiihg 



(After Granger aud Sinclair) 



I'pper : Lamhdotlieriiim Zone, Lost Cabin 

 Middle : Transition Zone, Lysite 





Si 



' W. D. Matthew : A Provisional Classification of the Fresh-water Tertiary of the West. 

 Bulletin of the Amoricnn Mus(>uni of Natural History, vol. 1L>. pp. 10-75. 



8 H. F. Osborn : Tertiary Mammal Horizons of North America. Bulletin of the Amer- 

 ican Museum of Natural History, vol. xxiil, art. xi, March 30, 1907, pp. 237-254. 



