Hobbs—The Correlation of Fracture Systems. 
25 
Tabulation of Fracture Systems for the United States. 
(Partial.) 
Bearing of Fracture Series. 
District and Au¬ 
thority. 
Great Basin of Western 
United States. 
General direction for Gt. 
Basin.—Giijert. 
Basin Ranges in Cali- 
forni? and Nevada.— 
Spurr. 
Upper Sevier Basin.—Gil¬ 
bert. 
Utah and Arizona.—Gil¬ 
bert. 
General Direction in Colo¬ 
rado plateau—Gilbert. 
Lake Bonneville (Old 
River Valley.)—Gilbert. 
Lake Lahontan.—Rus¬ 
sell. 
Lake Lahontan tN. of 37° 
lat.)—Russell. 
Telluride quadrangle in 
Cole.—Purington. 
Rico Mts. in Colo.—Ran- 
some. 
Globe Quadrangle in Ari¬ 
zona—Ransome. 
Bisbee Quadrangle in Ari¬ 
zona.—Ransome. 
Albuquerque and Magda¬ 
lena Mts. in New Mex¬ 
ico.—D. W. Johnson. 
Same.—Keyes. 
Death Valley in So. Cal. 
—Campbell. 
Boise Quadrangle, Idaho 
—Lindgren 
Livingston Quadrangle, 
Montana.—Iddings. 
Butte Min. District.—Em¬ 
mons & Tower. 
Merid¬ 
ional or 
near¬ 
ly so. 
N—S 
N-S 
N-S 
N-S 
N-S 
N-S 
N-S 
N-S 
Equator¬ 
ial or 
near¬ 
ly so. 
E-W 
E-W 
E-W 
E-W? 
In quad¬ 
rants NE 
&SW. 
NE-SW 
N 10°- 
30° E 
N NE- 
s sw 
N 38 Q E 
N 53°— 
63° E 
N 25°— 
65° E 
NE-SW 
NE-SW 
In quad¬ 
rants 
NW & 
SE. 
NW-SE 
Remarks. 
Formations also end 
in E—W cliffs. 
In clay. 
Also a perpendicular 
vertical set in clay. 
N 21°— Directions N 53°—63® 
51° W 
N 87° W 
N-N 45° 
W 
NW-SE 
NW-SE 
to WNW 
-ENE 
E and N 21°—51° W 
recognized as each 
containing several 
series. 
Also some others 
common. 
N-S 
N-S 
N-S 
NE—SW 
These are the direc¬ 
tions of major 
faults in modem 
mts. 
E-W 
E NE— 
w SW 
Rarely NE-SW. 
E-W 
N 30 p E 
N 60° W 
Mainly 
near E— 
W. 
In quadrant between 
NE and SE but 
mainly nearE—W. 
‘ ‘Secondary frac¬ 
tures” with dips 
from 45°—65° at 
right angles to 
mineral veins. 
