WESTERN OUTCROPS IN TENNESSEE IV 



Feet 



5. Sandstone 40 



6. Limestone 123 



Total 601 



The sandstone has become thicker and it forms a well defined bench. 

 The limestone is disappearing from the upper portion. The Lithostro- 

 tion is 244 feet thick at one locality in this county and contains much 

 chert, which, however, is mostly nodular and much of it is fossiliferous.* 



Mr Campbell, in Putnam, Overton, and Pickett counties, northeast- 

 ward from White to the Kentucky line, finds the conditions similar to 

 those on the east side of the plateau, and reports 



Feet 



Pennington shales 90 to 300 



Newman limestone 400 



About midway in the Newman he finds a sandstone, 40 to 60 feet, 

 shown along the face of the plateau. f 



Mr Campbell's average difters somewhat from the section obtained by 

 Professor SafFord in the southern portion of the area embraced in the 

 Standing Stone quadrangle, and evidences the continued decrease north- 

 ward. Professor Safford's measurements are : 



Feet 



1. Blue limestone 4 



2. Shales, marls, etcetera 52 



3. Limestones = 154 



4. Shales 6 



5. Sandstone 48 



6. Limestone 168 



Total 432 



7. Lithostrotion 203 



Numbers 1 and 2 probably represent the Pennington shales, which 

 thicken northward at the expense of the limestone, the upper part of 

 number 3 being very largely argillaceous limestone. The sandstone is 

 evidently one of those in the Hartselle, and it was identified by Professor 

 Safford with that seam east from Huntsville in Alabama. The Litho- 

 strotion contains much chert, but the bottom 75 feet is "an impure 

 limestone of water lime aspect."J 



The Mountain limestone of SafFord extends westward for onl}^ a few 

 miles beyond the Cumberland plateau, so that one finds beyond the 



* J. M. Safford : Op. cit., pp. 355-356. 



fM. R. Campbell: U. S. Geol. Survey folio, Standing Stone, 1899. 



t J. M. Safford : Op. cit., pp. 353-354. 



XI— BuLT,. Geol. Soc. Am.. Vol. 14, 1902 



