As the geological architecture of our country is variable depending on the area and on the age of the rocks involved, the know-how of the details of each stratigraphic interval requires specialization. This specialization can be related to a particular structural insight as might be the case for example in the Caledonian massifs of Belgium, related to the sedimentology of specific rock types such as chalks or limestones or related to the experience in particular fossil groups.

Therefore the National Commission for Stratigraphy is advised by several Subcommissions representing specific stratigraphic time intervals. The precise time intervals covered by the several Subcommissions might look arbitrary but they are the result of practical considerations and they have proven a satisfactory functionality for some decades now.

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