Willis Formation
(Pliocene) at surface, covers 39 % of this area Willis Formation
Lissie Formation
(Quaternary; Middle Pleistocene) at surface, covers 14 % of this area Lissie Formation
Deweyville Formation
(Quaternary; Pleistocene and Holocene?) at surface, covers 6 % of this area Deweyville Formation
Alluvium
(Holocene) at surface, covers 6 % of this area Alluvium
Terrace deposits
(Pleistocene and Holocene) at surface, covers 1 % of this area Terrace deposits