Willis Formation
(Pliocene) at surface, covers 28 % of this area Willis Formation
Lissie Formation
(Quaternary; Middle Pleistocene) at surface, covers 18 % of this area Lissie Formation
Alluvium
(Holocene) at surface, covers 12 % of this area Alluvium
Terrace deposits
(Pleistocene and Holocene) at surface, covers 3 % of this area Terrace deposits