Abstract
Mentions of the outcrop are important in the geological investigation. Because the number of recorded outcrops increases with investigation, we may have much difficulty to arrange records. For this reason, it is desirable that the database has not only outcrop lists but also have functions which construct the geological structure of the investigation area from outcrop data.
We studied the mathematical model of outcrops structure with the set theory on condition that the card type database is used, and applied the labeled directed graph D (V, A) to the stratigraphy of outcrop. When this graph is applied to the stratigraphy of outcrops, a set of nodes V is suited for a set of layer names, and a set of ordered pairs A is suited for the set of contact relation of each layers. We express mathematically the geological structure of an outcrop in the geological structure description language which is introduced from the labeled directed graph. A geological model of an area is also expressed from neighboring outcrops in this language. Furthermore, features of each layer and contact are expressed in connection with their geological structure using the binary relation.
