492 



Russell— Relations of the Great 



follows the fault plane. The flows are sometimes quite 

 thick near the fault, and the scarp could not have 

 remained a steep slope during the whole of Newark time. 

 It seems probable, therefore, that the bowlders were 

 derived from portions of basalt that were lifted up by the 

 faulting. 



Fig. 5. 



THICKNESS OF 

 UPRAISED 

 3L0GK ERODED 

 117 NEWARK 

 TIME P 



OST- 

 TRIASSIC 

 THROW 



TOTAL THROW 16,000 FT.+ 



3L 



TRIASSIC 

 THROW 



. Fig. 5. — Diagram to illustrate the discussion of the throw of the Great 

 Fault. 



The Throw of the Great Fault. 



Any estimate of the throw of the Great Fault must be 

 based on the thickness of the Triassic to the west. There 

 appears to be great uncertainty about the thickness of the 

 lower sandstones. Davis estimated their thickness to be 

 5,000 to 6,000 feet. The wells drilled in the Triassic near 

 its western border give a definite indication that these 

 lower sandstones are thicker than this. The facts about 

 these wells may be listed as follows : 



