For the fieldgeologist, "Unconformity" is one of the important object to survey. Especially, in the field of economic geology, it has come to be considered as the important oil trapper. However, unconformity has much variation of its scale and character. We propose the following definition of unconformity and it's classification because we wish to avoid the confusion and the obscurity on the practical treatment of unconformity.
The definition: unconformity is a phenomenon that a group of strata is separated from another by a plane which shows interruption of sedimentation. And the plane is named as "Plane of unconformtiy".
The classification:
a. Classification by appearance
1. Clino-unconformity
2. Para-unconformity
b. Classification by spacial extention
3. Regional unconformity
4. Partial unconformity
5. Local unconformity
c. Classification by bio-stratigraphy
6. Bio-discontinuous unconformity
7. Bio-continuous unconformity
8. Bio-discontinuous conformity-like unconfomity
All unconformity represent by the combination of these 8 classification. We add the classificationmark showing these combination.
抄録全体を表示