436 A. W. GRABAU PALEOZOIC DELTA DEPOSITS OP NORTH AMERICA 



Feet In. Feet In. 



19. Red shale 6 



18. Red sandstone 10 



17. Grayish red sandstone 15 



16. Red slate 1 



15. Green slate ' 1 6 



14. Gray sandstone 15 



13. Gray slate 1 



12. Brown sandstone 20 



11. Gray slate 1 



10. Brown sandstone 8 



9. Red shale 6 



8 V Reddish brown sandstone 75 



7. Red slate 1 



6. Red and gray sandstone : 200 



5. Red sandstone and shale, alternating with some green 



shales and brown sandstones 112 



518 



Base of the Juniata series. 

 4. Brown and gray sandstones and concealed members.... 150 



3. Gray sandstone and concealed members 409 



2. Gray sandstone 320 



1. Gray and slaty sandstone 440 



Base of the Bald Eagle. — 1,319 



Total 2,905 



The sandstones are often markedly cross-bedded, and the alternations 

 here give a good example of rhythmic succession of oxidized and un- 

 oxidized strata. If all the red beds of this section are included in the 

 Juniata, this would be 1,486 feet thick. Lesley 51 thinks that the "Ked 

 Medina" comprises the lower 518 feet, plus some 400 or 500 feet of the 

 overlying beds, making in all about 1,020 feet, but this would draw the 

 line in the middle of the concealed series (number 31) and would leave 

 a considerable thickness of red beds above this plane. At the base of 

 number 28 there occur some pebbly layers, which may mark a dividing 

 line between a Lower (Queenston) or true Juniata and an Upper (Me- 

 dina) series, the latter composed of reworked Juniata material. Whether 

 this is so or not has not yet been determined. The red beds are char- 

 acterized throughout by an abundance of clay galls thoroughly com- 

 pressed. 



At Belief onte Gap, in Center County, Pennsylvania, the Juniata has, 

 according to Eogers, a thickness of about 500 feet. It is here a "thin- 

 bedded gray and red argillaceous sandstone, alternating with a fourth 



51 Summary Final Report, vol. i, p. G47, foot-note. 



