Kattendijk Formation
The Kattendijk Formation (also known as the Kattendijk Sands) is a five million years old marine geological formation north of Antwerp, Belgium. including the north-western parts of the Campine region. The area was named by De Heuter and Laga in 1976. The sands range from medium fine to coarse and contain a large proportion of shell grit. Geology
The clay of the Rupelian era developed to a depth of approximately  beneath a deposit of Neogene sand. The formation has a Miocene Era aquifer, while the clay level dates to the Pliocene. Palaeontology
A Pliocene species of auk (Alca stewarti) was found in 2000. A small oceanic dolphin, Pliodelphis, is also known from the formation. References

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Geography of Belgium
Geology of Belgium