PERMIAN. 399 



and it was only after having passed Beavertown that I saw clearly I was upon 

 the New Red Sandstone. Since the discovery of Permian in Kansas I am still 

 more inclined to the belief that the strata between Delaware Mount and 

 Beavertown are Permian. Thus you see I include the Permian in the New 

 Red Sandstone formation." * 



Again, in another report on notes furnished Prof. Marcou by Capt. John 

 Pope, of a survey made from El Paso to Preston, on Red River, he says: 

 "The upper part and the headwaters of the Rio Brazos are situated on the 

 rocks of the Trias," and says in a note below, "I have since used the more 

 general expression of New Red Sandstone formation to designate all the 

 strata in America that lie between the Carboniferous formation and the Ju- 

 rassic rocks." 



I understand that while Marcou put all the Red Beds in Texas, from the 

 Coal Measures and well marked Carboniferous strata at Fort Belknap to the 

 foot of the Staked Plains at. Big Springs, in the Triassic, he did not intend to 

 say thereby that there were no beds in that district that might not properly be 

 placed in the Permian. On a trip which he made across the same beds from 

 Mount Delaware westward, as quoted above, he did not hesitate to place some 

 of the beds in the Permian. He made no personal examination of the line 

 between Fort Belknap and Big Springs, but made a report from notes and 

 material collected by Capt. Pope, United States Topographical Engineer. 

 Marcou says he called the Red Beds Trias on lithological and stratigraphical 

 grounds alone, not having found any fossils by which he could determine 

 their true geological horizon. The only fossils found were trees or petrified 

 wood. 



Doctor William DeRyee, formerly State Chemist, visited Archer County 

 in 1868, in the interest of the Texas Copper Mining and Manufacturing Com- 

 pany. In a report made to that company and published by them he says: 



"After traversing the Lias and Carboniferous series northward of Weath- 

 erford, I was agreeably surprised by a grand panorama of the outcropping 

 Permian formation. This system is extensively developed in Russia between 

 the Ural Mountains and the river Volga, in the North of England, and in 

 Germany, where it is mined for its treasures of copper, silver, nickle, and 

 cobalt ores. It has not heretofore been known to exist in this State, or has 

 been mistaken for the Triassic system, which is overlying the former to the 

 northwest." 



Prof. Jacob Boll, formerly of Dallas, Texas, in an article entitled " Geo- 

 logical Examinations in Texas," published in the American Naturalist, 

 Vol. XIV, pp. 684, 686, September, 1880, says these Red Beds of Texas are 

 undoubtedly Permian. 



* American Geology, Zurich, 1858. 



