NO. 12 PERMIAN BRACHIOPODS FROM OREGON—COOPER IQ 
CORRELATION OF THE OREGON FAUNA WITH THE PERMIAN FAUNA 
OF RUSSIA 
The Permian fauna of Oregon has obvious and close affinity to the 
fauna of part of the Russian Permian sequence. The published 
Russian work which illustrates these fossils best is that by Tscherny- 
schew (1902), especially the species described from the Ufa Plateau. 
Unfortunately, these are not adequately located stratigraphically. 
Tschernyschew described brachiopods from two regions in his 
great monograph: From the Timan arch in northeastern Russia and 
the Ufa Plateau in southeastern Russia. According to Dunbar (1940) 
Tschernyschew established a sequence in the Timan area consisting 
of the Omphalotrochus beds, Cora beds, and Schwagerina beds in 
ascending order. In attempting to apply this sequence to the strata 
of the Ufa Plateau far to the south, Tschernyschew made some mis- 
takes. The fossils he used for correlation purposes were not his zone 
guides, the fusulines, but the brachiopods which accompany them. 
Consequently, in the Ufa Plateau with its reefy developments, facies 
fossils were mistaken for guide fossils with the result that the Schwa- 
gerina zone was identified far above its true position. The “Schwa- 
gerina” zone of the Ufa Plateau region thus contains brachiopods 
that do not occur in the true Schwagerina zone. 
Lately the “Schwagerina”’ zone of the Ufa Plateau has been divided 
into four formations in ascending order: Chernya Rechka, Irghina, 
Sarga, and Krasnoufimsk formations. These make up the Artinskian 
in this region (Tolstikhina, 1935). Lists of species from these forma- 
tions are given by Fredericks (1934), Gorsky (1937), and Tolsti- 
khina (1937). Most of the Russian species identified in the Oregon 
Permian and other closely related forms range throughout these 
formations. These Russian species are Kochiproductus porrectus 
(Kutorga), Krotovia pustulata (Keyserling), Stenoscisma mutabile 
Tschernyschew, Cletothyridina gerardi (Diener), Squamularia ros- 
trata (Kutorga), and Spiriferella draschei (Toula). 
These Russian species therefore permit correlation with the Artin- 
skian. It is more difficult to delimit the part of the Artinskian repre- 
sented in Oregon. The Chernya Rechka formation can be eliminated 
from consideration because it contains Scacchinella and other fossils 
indicating a late Wolfcampian or early Leonardian age. The Oregon 
fauna thus seems best to conform with the Irghina and Sarga faunas 
and is thus correlative to medial or late Artinskian. 
Study of the Permian brachiopod fauna thus indicates that corre- 
