MAP 
OF THE TERTIARY 
AURIFEROUS GRAVEL DEPOSITS fs 
f if 
} TINTS = 4 
| LYING BETWEEN ae 
y as i 
ry x x hI a >i x ay ! i Pamiee 
THE MIDDLE FORK OF THE AMERICAN 
Y r x | TTY AD x = 
AND THE MIDDLE YUBA RIVERS 
mrerdding the principel hydraulic mining region of the State ; 
and showing also the range and extent of the volcanic overflows 
and the location of the gravel and quartz mining claims 
officially surveyed for US.Patent 
Scale {mile to Linch. 
ee 
Compiled by C.F HOFFMANN and A.CRAVEN : 
From surveys by Messrs. BOWMAN,WH.PETTEE and W.AGOOBYEAR, 
Together with Information furnished by the U.S.Surveyor Genls office tee 
and the various Ditch and Mining Companies 
1673 
To accompany the ei the Museum of Comparative Zoology” Vol. VI. Part 1 i 
é a 
: ys ie 
i SS | 
(oe =) 
a | - dqEumpire H \ 
ree, 
YY YY Ue: 
| ee Wy | tino sess 
High Gravel Deposits Volcanic Overflows Gravel Claims Quartz Claims é oe | : : = AY __"Platt — 
+ pz a eS : 
