214 The American Gtologist. Manii, i89:i 
The u|»per part. coiTespoiuUiig tn 1113' divisions <4. and V. of 
Pyramid niouiit. is referred by .Mr. Hill to rlip typical I>akota sand- 
stone, which means tlie lower part oT the true chalk or Upper Cre- 
taceous. As he gives no list of fossils, it is impossible to compare it 
with the typical Dakota sandstone of Nebraska. The middle part, 
corresponding^ to my division E. with the (rri/phud tucniiicari and (hfrea 
y/(«/-.s7///, is referred by -Mr. Hill, to his Denison beds of his Washita 
division, tluit is to say, to his uppermost ])artof what he calls his ].,ower 
Cretaceous. No list of fossils is given, so it is impossible to know if the 
GrujjJiu'ii tnriniirii ri i\])(l Osfira iiiiir>iliii hnve been found bj' him at l>eni- 
son, and to comjjaiv the fauna of th(^ Turumcari witli thn faiina of 
Denison. 
The lower part, corresponding to my ilivisions D. C. and 15., is referred 
by ^Ir. Hill to the typical Trinity sands. No list of fossils is given for 
the Trinity sands of Te.Kas, nor for the Trinity sands of Tucum- 
cari. 
As a whole, the conclusion arrived at, in IS92, by .Mr. Hill, is the 
realiirmation of the age of the Tueumcari section, to be Nebraska 
Cretaceous, as originally described by Mr. James Hall, in 1857. 
Between those two reattirmations, one Jurassic and the other Cre- 
taceous, and both without any paleontologlcal, stratigrai)hical and 
lithological proofs; it is rather ])erplexing to know on what ground 
and on what observations ]\lr. Hill has based his conflicting opin- 
ions. 
According to Mr. Hill the Tueumcari region is an "inaccessible 
locality." 80 it was when I visited it in 1853; but since 1887 it is 
easily accessible, for it has been visited twice by Mr. Hill and once 
each by ^Messrs. Hyatt, I. C. Russell and Cummins 
The method of correlation employed by me was to give names of 
the fossils discovered and their relations with typical European fos- 
sils ; and as soon as practicable I had the fossils figured and ])ublislied 
as early as 1855. two years after my exploration, and I described them 
with details in 1858 ; so, in less than five years every proof was given 
in full, with geological map and sections, notwithstanding the great 
ditiiculties of having my pajjers published first in French in Paris, and 
afterward in English at Zurich ( Switzerhuui ). 
'Slv. Hiir acts differently, and his metliod of correlation consists 
simply in reaftirmation of the conclusions of others, without giving 
any prt)ofs or even any reasons for so doing. 
Incorrect paleontology and inexact stratigraphy and lithology have 
been used constantly against my observations. Is it too much to ask 
my opponents to i)ublish soon a comi)lete monograph of the Tueum- 
cari region? Under rather diflicult circumstances I have contributed 
my pioneer share to the knowledg." of the g;^i)logy of a country abso- 
lutely unknown until my exploration of 1853. Now it is their turn to 
publish what they have seen and found. .Ii i.ks .M micoi. 
Cdiiiliriili/i'. Miis!;.. I),'i-. ]/;. is'j;. 
