CLASSIFICATION OF UPPER PALZZOZOIC ROCKS. 769 
10. Myalina kansasensis, Shum. (tr) 
11. Myalina perattenuata, M. and H. (rr) 
12. Pinna peracuta, Shum. (tr) 
13. Bellerophon cf. Montfortianus, N. and P. (rr) 
14. Allorisma cf. subcuneata, M. and H. (tr) 
15. Schizodus cf. curtiforme, Walcott. (1r) 
16. Macrochilina angulifera, White (?) (1) 
It will be seen from the above faunas that in this formation 
we have strata containing Carboniferous fossils only, alternating 
with strata containing a mixture of Carboniferous and Permian 
fossils. The yellowish shales with abundant specimens of Cho- 
netes granulifera, Owen, contain only Carboniferous fossils, while 
the blocky shales and dark gray limestones contain such species 
as Pseudomonotts Hawn, Meek and Hayden, Pleurophorus sub- 
costatus, M. and Worth., etc., which are usually considered char- 
acteristic of the Permian or Upper Carboniferous. On account 
of the predominance of the strata containing this mixed fauna 
it seems advisable to consider the Neosho as the lowest forma- 
tion of the division generally called the Permo-Carboniferous. 
This classification would not differ greatly from that of Meek 
and Hayden, as defined in 1867 by Dr. Hayden when he stated 
that “‘Meek and Hayden regarded the beds..... down so far 
as to include most, if not nearly all, of Professor Swallow’s 
Lower Permian, as an intermediate connecting series between 
the Permian and Coal Measures, which, if worthy of a distinct 
name at all from the latter, should be called Permo-Carbon- 
WT 
iferous. 
tAm. Jour. Science, 2d series Vol. XLIV., p. 37. It will be remembered that 
Swallow called the ‘dry bone limestone” the base of his Lower Permian, which is 
about 62 feet below the base of the Neosho formation; and Meek and Hayden did not 
indicate a precise line of division. Some geologists consider that Meek in his Report 
on the Palzontology of Eastern Nebraska referred the Permo-Carboniferous and 
Permian of Kansas to the Carboniferous; but the writer understands that classification 
to apply only to Nebraska, for Meek said: “All of these strata under consideration 
along the Missouri..... really belong entirely to the true Coal Measures; unless the 
division C, at Nebraska City, and some apparently higher beds below there on the 
Missouri, may possibly belong to the horizon of an intermediate series between the 
Permian and Carboniferous, for which, in Kansas, Dr. Hayden and the writer pro- 
posed the name Permo-Carboniferous” (Final Rept. U. S. Geol. Surv. Neb. and adjg. 
Territories, 1872, p. 130). 
