BLOCK FAULTING IN THE KLAMATH LAKES REGION 233 
of certain block mountains. The topography strongly suggests 
that Parowan Valley is a down-dropped block, bounded on the 
southeast by a fault-block plateau and on the northwest by a 
fault-block mountain whose more gentle back slope is toward the 
northwest. 
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Fic. 3.—The Parowan graben, Utah, showing abandoned antecedent gorge 
through block mountain on the northwest. 
Cutting transversely through the block mountain just mentioned 
is a remarkable gorge directly in line with the extended lower 
course of a stream which rises in the block plateau and flows north- 
west through the town of Parowan. According to the map, how- 
ever, the stream does not continue through the gorge at the present 
time, but terminates in a salt lake at the base of the fault scarp. 
The topographic relations suggested the possibility that a recent 
upfaulting of the block mountain had obstructed the Parowan 
stream and left the antecedent gorge deserted. If this be the 
