Area05
U-5a
Crack
Paper Map--USGS Tech Ltr NTS-110
Zone of Abundant Fractures
U-5b
USGS Tech Ltr NTS-135
Many closely spaced fractures
Sink
Symbol (sink hachure)
Fracture set
U-5k
Mylar Map--Area11 Composite
U-5e
USGS Tech Ltr NTS-125 & Field Map