Summarised stratigraphic data are presented for 93 bores in the Adelaide Plains Sub-Basin of the St. Vincent Basin from hundred of Dublin to hundred of Noarlunga, including the Adelaide City area on the Para Fault Block. For the purposes of this Bulletin, the Cainozoic succession (Middle Eocene to Recent) is divided into 14 units which are primarily rock units or (particularly in the Pliocene and Quaternary) groupings of rock units. The maximum total thickness exceeds 2,OOOft. (610 m.). Characteristic lithologies and microfaunas are outlined, and units are related to their type sections. The emphasis is on Eocene to Miocene stratigraphy in marine facies. A new formation name Carisbrooke Sand is proposed for the usually unfossiliferous ?Plio-Pleistocene quartz sands between the fossiliferous Pliocene beds and the Pleistocene Hindmarsh Clay in the Sub-Basin, particularly in the eastern part. Aggregate-range charts are presented for the planktonic foraminifera (42 species or varieties), and for 53 selected species of benthonic foraminifera