PART I CHAZYAN AND RELATED BRACHIOPODS—-COOPER 121 
byites zone appears in the form of a bryozoan reef on the west side of the road. 
The brown and purplish shales on the east side of the road contain the fauna 
accompanying Multicostella convexa at the type section. 
At Rock Crossing in the Criner Hills the Multicostella convexa zone occurs 
just under the thin-bedded, light-colored limestones of the upper Bromide. The 
section underlying the Multicostella zone here is composed mostly of green shales 
and thin-bedded, brownish limestone. 
Brachiopods from the Mountain Lake member are: 
Acanthocrania erecta Cooper 
A, subquadrata Cooper 
Atelelasma oklahomense Cooper 
Bellimurina compressa Cooper 
B. subquadrata Cooper 
Chaulistomella crassa Cooper 
C. mira Cooper 
C. mundula Cooper 
C. nitens Cooper 
C. obesa Cooper 
Dactylogonia sculpturata Cooper 
D, subaequicostellata Cooper 
Doleroides compressus Cooper 
Fascifera dalmanelloidea Cooper 
Glyptorthis crenulata Cooper 
G. obesa Cooper 
G. uncinata Cooper 
Hesperorthis crinerensis Cooper 
Lingulella galba Cooper 
Macrocoelia bella Cooper 
Mimella extensa Cooper 
M., subquadrata Cooper 
Multicostella convexa Cooper 
M. sulcata Cooper 
Murinella partita Cooper 
Onychoplecia tenuis Cooper 
Opikina expatiata Cooper 
O. gregaria Cooper 
Oxoplecia filosa Cooper 
Paurorthis macrodeltoidea Cooper 
Petrocrania sp. 3 
Philhedra sp. 1 
Protozyga costata Cooper 
P. elongata Cooper 
P. magnicostata Cooper 
Rostricellula cuneata Cooper 
Skenidioides oklahomensis Cooper 
Sowerbyella indistincta Cooper 
S. plicatifera Cooper 
S. vulgata Cooper 
Sowerbyella sp. 1 
Sowerbyites lamellosus Cooper 
Valcourea transversa Cooper 
Pooleville member of Bromide formation.—This name is proposed for the 
upper limy beds which are quite uniform in lithology from place to place but 
vary considerably in thickness. The name is taken from Pooleville on the west 
side of the Arbuckle Mountains, but the type section is on Spring Creek above 
the Mountain Lake member about on the line between secs. 8 and 17, T. 2 S., 
R. 1 W., Murray County. Here is mostly a light-gray to nearly white limestone, 
thin bedded except for the top 15 feet which is massive and contains Receptacu- 
lites. The member at the type section is about 250 feet thick. The lowest zone is 
that of Strophomena oklahomensis, then follows a zone of Oxoplecia gouldi, a 
zone of Doleroides oklahomensis. A zone with Ancistrorhyncha occurs near the 
top. These zones are not present in all sections, and their thicknesses are different 
in different sections. It is also clear from the variations of thickness in this part 
of the column and the different zones that occur at the top of the section in 
different places that the contact with the overlying Viola formation is an uncon- 
formable one. 
This is essentially the interval to which Ulrich applied the name Criner on 
several of his charts. Ulrich, however, failed to define the formation and to desig- 
nate a type section. It seems best, therefore, to use another name. Besides, the 
