206 



AN AMERICAN GEOLOGICAL RAILWAY GUIDE. (ARK.) 



Arkansas/ 



GENERAL GEOLOGY OF THE STATE. Dividing the State diagonally from northeast to southwest, 

 beginning near the eastern boundary of Randolph county and running thence past Grand Glaise 

 and Little Rock, through to Fulton in Hempstead county on Red River, (consequently nearly in 

 the line of the St. Louis, Iron Mountain and Southern Railroad), almost all the State, east of said 

 line, will be found of the 19. Tertiary formation, except along the river bottoms, where it is 20. 



Quaternary. The northern portion, west of said line, is mostly 2-8. Silurian, with some 9-12. 

 evonian and 14. Carboniferous, further south; the middle western part of the State being 14. Car- 

 boniferous, while the southwest part (namely, from Arkadelphia and Murfreesboro south and west) 

 will be found 18. Cretaceous. 



In consequence of the above general arrangement of the geological formations in the State, it 

 will be readily perceived that the St. Louis, Iron Mountain and Southern Railroad runs mainly near 

 the junction between the Silurian, Carboniferous and Cretaceous of the west side, and the 19. 

 Tertiary, with some 30. Quaternary, of the east side. Further, that the Arkansas Central is chiefly 

 in the 19. Tertiary and 20. Quaternary, while the Little Rock and Fort Smith Railroad passes 

 through the 14. Carboniferous formation; also, that the Memphis and Little Rock Railroad runs 

 through 19. Tertiary and 20. Quaternary. 



The expression, " Quaternary over Silurian," is intended to indicate that the superficial deposits 

 of the locality, opposite which the remark is placed, are Quaternary ; but that when lower forma- 

 tions are exposed by denudation, &c., they would be found Silurian. A similar interpretation is 

 designed to be given to " Tertiary over Cretaceous," and the like expressions. R. O. 



Ms. 



Arkansas Central Railroad. 



St. Louis, Iron Mountain and Southern R.R. 



186 Moark. 

 192 Corning. 

 203 Peach Orchard. 

 214 O'Kean. 

 225 Walnut Ridge. 

 232 Minturn. 

 244 Swifton. 

 262 Newport. 

 273 Grand Glaise. 

 278 Bradford. 

 292 Judsonia. 

 305 Garner. 

 312 Beebe. 

 320 Austin. 

 332 Jacksonville. 

 345 Little Rock. 

 355 Mabelvale. 

 368 Benton. 

 388 Malvern. 



410 Arkadelphia. 



437 Boughton. 

 449 Emmet. 

 457 Hope. 

 471 Fulton. 

 490 Texarkana. 



20. Quat. over Silurian. 



14 a. Millstone Grit. 



14. Carboniferous. 



(Junction of 14. Carb 



(18. Creta. & 19. Ter. 



19. Ter. over 18. Creta. 



Ms. | Arkansas Central Railroad Continued. 



* Prepared by Prof. Richard Owen, of Bloomington, Indiana. 



