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Example of Annotated Isopach Map

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• Description: Annotated isopach maps supplement the information about thickness with information on the vertical relations of the mapped stratigraphical unit.
  
  The following symbols are added to the contour value:
  1) N for contours where the boundaries of the mapped unit are conformable at top and bottom.
  2) S for contours of the un-reconstructed thickness of the unit at outcrop.
  3) Abbreviated name of overlying unit/abbreviated name of mapped unit for contours where it is truncated by the overlying unit.
  4) Abbreviated name of mapped unit/abbreviated name of underlying unit indicating onlap.
  
  The following lines are distinguished:
  1) Dotted line shows where surface outcrop of the mapped unit dips beneath cover.
  2) Dashed line shows where mapped unit onlaps/overlaps an underlying unit.
  3) Crinkled line shows the line of truncation of the top of the mapped unit.

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