Whitney's Geology of California. 355 
The great feature of this county, economically considered, is 
the so-called “ Mariposa Estate,” on which are some of the most 
the mountains being in the main parallel with the strata. 
Subordinate to these belts of slate and sandstone are masses 
of serpentine and beds of limestone. The extreme southern 
end of the estate is occupied by granite, which cuts across these 
belts and extends, on ithe side, beyond its limits 
The slate belt is of the most interest to the public, for in it 
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Then occurs a break, extending across them, where the slates 
are much broken and confused. North of this, the strike is N. 
28° W., a change of 26°, This portion extends from the Ophir 
to the Pine Tree mine. Near this is another break, where the 
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