1. 
   isopach
   isopach, isopachous A line on a map that connects points of equal thickness within a particular stratigraphic unit or group of units.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2795/7
   
   
2. 
   Isopach
   A line, on a map, drawn through points of equal thickness of a designated unit. Synonym for isopachous line; isopachyte.
   Found op http://www.coaleducation.org/glossary.htm
   
   

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