SYMBOLS

CONTACT

FAULT--Dotted where concealed.  Bar and ball on downthrown side.
      Includes shear zones as well as faults in Precambrian rocks in
      the Wind River Range, Medicine Bow Mountains, and Sierra Madre

THRUST FAULT--Dotted where concealed.  In some places the dotted
      line indicates where the fault intersects an unconformity be-
      tween faulted strata below and unfaulted strata above; in
      other places it indicates where the shallower part of the
      fault disappears into bedding planes. Sawteeth on upper plate.
      Some thrust faults are deeply buried and are approximately lo-
      cated on the basis of seismic data and drilling

THRUST FAULT WITH YOUNGER NORMAL FAULT ALONG SAME TRACE--Dashed
      where approximately located; dotted where concealed.  Sawteeth
      on upper plate on thrust fault; bar and ball on downthrown
      side of normal fault

SHEAR ZONE


IMPACT STRUCTURE--Not exposed; determined by drilling; date of
      emplacement between Triassic and Late Jurassic time (Karl
      Klaenhammer, written commun., 1980)