Discrepencies. Different researchers use different cut-off points for what we term low-angle faults. We will go with the text definition of dips <30° Fault workers commonly refer to lenses in fault zones as horses when they are m-km scale structures
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How to evaluate whether a fault is present in the subsurface or an area of poor exposure
Abrupt lithologic change
Abrupt change in orientation of bedding or foliation
In both cases, look for evidence of fault-zone deformation with proximity to contact
Nonconformity - look for evidence such as basal conglomerate
Angular unconformity (see above) or Fold (look for lithologic continuity)