Abstract
We have presented the process of geologic mapping in mathematical formulae, and constructed the software system CIGMA. Input data are composed of numerical data and relationship data. Numerical data show the coordinate of point, and strike and dip of the stratum. Relationship data show the structural relationship between two strata. Though these types of data are independently processed in this system, input data for geologic mapping should be essentially observed in the field. Observed data have been accumulated in the outcrop database, The CIGMA system is one of the softwares to which the outcrop database can be applied.
