2.11.2.3. Putte Member

Name

The term has been introduced by Vandenberghe (1974, fig. 8.1., p. 16). Putte is a municipality in the south of the Antwerp province.

General characteristics

The Putte Member overlies the Terhagen Member and can be easily distinguished by the systematic occurrence of black organic rich layers and the occurrence of relatively thin very silty layers.Therefore the clay is darker than the Terhagen Member (see Vandenberghe, 1978, photo 6, p. 33). The contact between both Members is always easily observed in outcrops as well as on natural gamma ray borehole logs. Towards its top the Putte Member clearly becomes more siltier. The boundary with the overlying Boeretang Member (Fig.1) is defined at the level where a clear shift occurs to even more silty layers, in particular well visible on geophysical resistivity logs, at silt-layer 0 (rsee figs 1,3).

Occurrence

The Putte Member occurs everywhere the Terhagen Member occurs. It is limited below by the Terhagen Member and above by, subsequently from west to east, Pliocene, Miocene, Oligocene (Boeretang Member, Eigenbilzen Formation and locally the Voort Formation) and again Miocene deposits. The thickness can be over 50 m but it can be significantly reduced by erosion. In the outcrop area is can also be directly overlain by Quaternary deposits.

Stratotype

The upper part of the active clay exploitation front along the cuesta between Rumst and Boom; map sheet 23/3-4 (Boom-Mechelen).

Coordinates: X =154.000; Y = 197.500; Z = + 30 m.

Previous designations

Geological Map 1/40.000: R2c p.p.

Stratigraphical Register (1929, 1932): R2b p.p.

New Geological Map 1/50.000: BmPu