Corre.sjjomlence. 
895 
in my later papers, especially one upon the Comanche series ol' the 
Arkansas-Texas region, read before the Geological Society of America, 
in Washington 1891, and published by the society, I separated the 
lower beds of the Comanclie series from the Fredricksburg division, 
and placed the Trinity sands and Glen Rose beds in a distinct division, 
to which I gave the name of Trinity division. The state geologist of 
Texas participated in the discussion whicli followed the reading of 
this paper [See Bui. Geol. Soc. Amer. Vol. ir, p. 327] and inasmuch as 
the section there published is reproduced by ]Mr. Taff without a word 
of credit, except for horizons, I append it in parallel columns with his. 
Secfioii and Nomenclature of the Com- 
anrlie Series as pnblisheil by Hill in. the 
Bulletin of the Geological Society of 
America, May, 1891. 
Definition oftue Terranes. 
CONSTITUTION OF TH?: COMANCIIJ: SEUI?:S. 
C. The Washita, or Iiiiliaii Territory 
Division. 
11, TheDenisou Beds. 
10. Tlie Fort Worth Limestone. 
9. The Dncli Creeli Chalk. 
S. The KiamitiaClavsor Schloenhachiu 
Beds. 
B. The Fredericlvsburg or Conianclio Pealt 
Division. 
V. The Goodland Limestone. 
<). The Caprina Limestone. 
h. The Comanche Peak Chalk. 
■1. The Gryphwa Eock and \\alniit 
Clays. 
3. The Paluxy Sands. 
A. The Trinity Division. 
•1. Tlie (Uen Rose or alternating beds. 
1. The Trinity or Basal Sands. 
Section and Nomenclature of the Com- 
anche Series as published by ./. A. Taff, 
Third Annnal lieport Geolor/ical Surrey 
of Texas, Sept. 1892. 
I. Lower Cuetackous. 
Washita Division. 
m. Vola limestone (3). 
1. Arietina clay. 
k. Denison (3). 
j. Fort Worth (3). 
Fredericksbnrg Division (2). 
i. Kiamitia clay (3). 
h. Austin marble (3). 
g. Flag limestone (3). 
f . Caprina limestone (1). 
e. Comanche Peak (1). 
d. Texana. 
Bosque Division (a). 
c. Paluxy sand (3). 
b. Glen Rose (alternating) bed(3i. 
a. Trinity sand (3)." 
*(1) B. F. Shumard, (2) Dr. Perd. Rcemer, 
(3) R. T. Hill. 
Why, after the general section had long been i)ublished, Mr. Taff, my 
former assistant, should })ublish the arrangement of this section and 
its description as original, with no other credit given than the nomen- 
clature of the above given horizons, may be attributed to the early 
attempt of an able young worker at publication, but his substitution 
of "Bosque" for my Trinity Division, [See Bull. Geol. Soc. Amer. 1891, 
pp. 508-5-28] and his accrediting to Dr. Ferd. lloeiner my Fredericks- 
burg division is remarkable. 
I am always glad to correct any errors in my wt)rk,and I have some- 
times amended my nomenclature. F^otli of these jn-ivileges every 
worker, especially one in a progressive science, has, but it is doubtful if 
others can change an established nomenclature without explanation. 
In the nomenclature of the ('oinaiicln' and Fppcr Cretaceous, in 
my later papers, I have sought to substitute geographic for paleon- 
tologic designations of beds, but have aimed to give credit to the 
humblest assistant. I ask that the readers of ]\[essrs. Cummins' and 
Taff's papers compare them with my report in the First Annual Re- 
