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 70 m 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.