Geology Reference
In-Depth Information
A
California
aqueduct
Wheeler Ridge
thrust
anticline
anticline with
plunge direction
wind gap
0
1
2
3 km
water gap
area of
map below
transverse fault
landslide
Plieto thrust
Geomorphology and
Structure of a Laterally
Propagating Fold
Fig. 4.39
Wheeler Ridge,
a plunging fold in
California.
A. Shaded relief 30-m DEM
of Wheeler Ridge fold and
Plieto thrust fault system in
the southern San Joaquin
Valley, California. Wheeler
Ridge anticline plunges and
propagates to the east.
Dissection is more intense
on the more steeply dipping
forelimb of this asymmetric
anticline. B. Map of
geomorphology around
Wheeler Ridge. Stream
patterns indicate deflection
of streams toward the east
by the growing fold.
Antecedent streams persist
in water gaps, but these
streams appear localized by
transverse faults. dd:
deflected drainage. Modified
after Burbank
et al.
(1996c).
B
depositional
shadow zone
local fans
80
0
Whee
A
900
35°N
119°W
A'
dd
transverse
fault
landslides
0
1
2
3
km
Why should one care about the shape of a
growing fold or various folding models? Folds
are a fundamental component of many orogenic
settings. Folding is ubiquitous above blind
thrusts, as well as almost any thrust fault that
ruptures the surface. When trying to reconstruct
the deformation that has occurred in a given
region, most previous studies tended to focus
