NO. 12 PERMIAN BRACHIOPODS FROM OREGON—COOPER 3 
so abundant as to form a calcareous conglomerate. It seems probable 
that these pebbly facies represent a local reworking of underlying 
Pennsylvanian sediments. 
Limestones of the Coyote Butte formation are interbedded with 
large amounts of sandstones. Furthermore the discontinuous nature 
of some of the limestone exposures leads to the impression that these 
deposits are lenticular within the arenaceous facies. Generally speak- 
ing, exposures of the sands are poor, while the limestones form promi- 
NT 
REDCLT 
SOC 
ane Oi 
R24E R2SE 
N 
N 
\ 
a4 
Zi 
g 
Wh 
4j 
GW 
7 
re a 
Hy 
i 
L. 
L S. 4A 
a 
hae A 
7 a a 
» 
= 
> 
z 
fe Vi, 
a 1 ( 
BX 
1S 
%, 
Ls) 
2b 
, 
es 
PIE 
So 
AP) 
ie 
‘isis: 
EXPLANATION 
J = Jurassic 
2 
R ® Triassic 
Pc Permian (Coyote Butte fm.) 
Cs = Penn. (Spotted Ridge formation)’ 
Cc Miss. (Coffee Creek formation) 
CH= Chert 
° 1/2 1 2 
SSS | 
Fic. 1—Map of Grindstone-Twelvemile Creeks area, central Oregon, showing distribution 
Permian rocks (oblique lines) and localities (numbers) from which brachiopods were taken. 
Map redrawn after Merriam and Berthiaume, 1943.) 
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