Clayey sands grading upwards into very fine-grained sands. The colour of the sand is greenish-grey and the glauconite content is low. Marine shells occur locally. Can only be easily recognised in the Roer Valley Graben. Represents the sandy upper part of the Veldhoven Formation.
Inner-neritic marine environment.
Conformably overlies the Wintelre Member. The transition is gradual. On the Peel Block and the Venlo Block, the Veldhoven Formation consists mainly of sands with only a very thin Wintelre Member. There, the Someren Member can only be identified with the help of biostratigraphical data.
Unconformably overlain by the Breda Formation, except possibly in the Roer Valley Graben. In the graben the upper boundary is marked by a change in pattern of SP-log readings, from rather gradually decreasing values below the boundary, to medium- to high-amplitude variations above it. On the Venlo and Peel Blocks, the transition is expressed on the gamma-ray log as an overall change towards lower readings. The lowermost few metres of the Breda Formation, however, have relatively high gamma-ray readings because of their high glauconite content.
