Scientific Earth Drilling Information Service - SEDIS
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fractures
NT
closed fractures
columnar joints
concentric fractures
conical fractures
conjugate fractures
cross fractures
dip fractures
extension fractures
joints
open fractures
polygonal fractures
release fractures
RT
asperities
bedding
brittle deformation
cleats
cracks
deformation
engineering geology
failures
faults
fissures
folds
foliation
fracture cleavage
fracture zones
fractured materials
lineation
microcracks
naturally fractured reservoirs
neotectonics
oblique or
SN
Used for a break in a rock usually without displacement.