This is a list of all the sedimentary formation that are found in Belgium.
Name Age Aalter Formation Eocene Brussels Formation Eocene Gentbrugge Formation Eocene Hannut Formation Late Paleocene Heers Formation Paleocene Houthem Formation Paleocene Ieper Group Eocene Kortrijk Formation Eocene Landen Group Late Paleocene to Early Eocene Lede Formation Eocene Opglabbeek Formation Paleocene Rupel Group Oligocene Tienen Formation Paleocene to Eocene Tielt Formation Eocene Tongeren Group Late Eocene to Early Oligocene Voort Formation Oligocene Zenne Group Eocene