,1 Sfiuli/ of file /ich-itlere Beth. — Ci-n<jiii. HH:? 
than the Fort Worth [Eplaster elegdii.s) zone of the Washita. 
Messrs. Diimble and Cumniins' section indicates that the 
Tucumcari zone belongs to a position a little below that of 
the Ostrea quadrHpIicata zone which they describe as below 
that of Epiuster e/egan.s and which, to distinguish it from 
the quadnqjlica fa -henring liorizons above the Fort Worth 
zone may be called the Kenf bed. This Kent bed occupies a 
position near that of the north Texas Duck Creek, and the 
Mentor terrane is perhaps not far, in horizon, from the Kent. 
The paleontological aspect of tiie mollusk-bearing beds of 
the Tucumcari district, as portrayed by Prof. Hill, is such as 
to show that a portion of those beds must Ix- referred to the 
Kiowa shales. But too little has yet been published as to the 
stratigraphic range of the fossils of the Tucumcari district to 
warrant the conclusion that all of those beds should be so 
referred. The Tucumcari zone of the Kiowa is there tinely 
developed, 
Turhiiiolia fe.raiia, which Prof. Hill gives as one of tlie Tu- 
cumcari district fossils "peculiar to and characteristic of the 
Washita division.'" may occur in the Washita, but is certainl}'' 
not confined to it. It is, on the contrary, one of the common 
fossils of the Comanche Peak limestone in the typical North 
Texas region. In the outlying E\ Paso and Tucumcari dis- 
tricts it very likely occurs in the inter-Fredericksburg- Wash- 
ita group of sediments. 
The evidence taken altogether seems to i>oint to tlie conclu- 
sion that the Kiowa shales of Kansas, the Kiamiti;i and 'I'u- 
cumcari shales of Indian Territoiy, the limestones ob and oc 
of Messrs. Dunible and Cummins' Kent section, and a portion 
of the mollusk-bearing beds of the Tucumcari district, repre- 
sent a group of sediments intermediate between tiu' Freder- 
icksburg and the Washita divisions, and one which, as the 
meeting ground of the faunas of tht^sc two divisions, cannot 
satisfactoril}" (though it may arbitrarily ) he referred to 
either. 
CLASSIFICATION OF COMANCHK TKKKANKS. 
A brief statement of the classification ado])ted by the writer 
for the sediments of the Comanclu' series is added in conclu- 
sion, to indicate the basis of the stratigra|)hic i-ei'erences in lhi< 
article. 
