376 T/t.e American Geologist. Deccmiwr, iH9.i 
above the Tritis tind below the true Cretueeous Neoeomiau of 
Texas, and puts it far up, as the upper portion of tlie Lower Cre- 
taceous, or Washita division. 
Another grave error is the rechiction of the Texan Trias to the 
upper 200 f(!et of that system, wliich h;is truly in Texas a thick- 
ness of no less than 5,000 feet; and to refer to the Dyas or Per- 
mian, not only the Lower and Middle Texan Trias, but even two- 
thirds of the Upper Trias, reducing the great Texan Trias to an 
insigniiicant system: and at the same time giving to the Texas 
Dyas an importance absolutely imaginary, and <nit of all propor- 
tion to its value and position in American stratigraphy. Besides 
Mr. Cummins has increased also the already very great formation 
of the Coal Measures or Carboniferous, ii> placing in it the Lower 
Dyas of Nebraska City and Plattemouth, Nebraska, which he calls 
x\lbany and Cisco divisions of the Coal Measures. 
As the (leological Survey of Texas has begun to publish geo- 
logical maps of great area, in the Third Animal Etport. it is im- 
portant to signalize to its director the ditt'erence of opinions held 
by other observers than his own assistants in the survey, on ques- 
tions which involve great scientific responsibilities, not only for 
Texas, but also for American geology. 
Here is the detailed table showing the order of succession and 
classification of northwest Texas, the Indian Territory and New 
Mexico by Mr. Cummins, in comparison with the classification 1 
have given as far l)ack as 1853, and which Jias been repeated in 
detail in Tuk American (Ieolooist, September. 1889. pi). 
156-157. 
Mr. Cummins" daasitication in North-west Mr. Marcou's Classification. 
Texas and New Mexico, 1890-18in. 1H53. 
I (ri'i/phaa pitcheri linie- 
f n, r.T^«TT. ' Stone of Comet creek, or 
'""^^■^'^'^"^ '"• i' Neocomian. Thickness, 
I, 5 feet. 
Break. ITnconformity. 
Tertiary.-No. a.^White^clayey limestone. g^^^.^,^ ^^ p^^^^,^^.^, ,,^^,^,^^_ ^,„^.,,„^. 
g r Washita diWsion, numbered 3, 4, 5 and S, |^ | No"Tertiary.-.Inrassic rocks nun,- 
§ i and corresponding to F. E, D, and C, ^ ^ j )ZS^'V^^'Z^Z' i'^a 'y 
Ijof Marcon-s section, at ti>e Tucun.cari ^^ l^^^jjji ^^^'JI^S.'^O^ f^e^'^ 
^ I area.— 375 feet. 
