The Group comprises (in ascending order i.e. oldest first) the Crackington, Bideford and Bude formations.

[1] The Crackington Formation is over 1km thick in the Exeter area but amounts to only 250m around Bideford.

It consists of mudstones with lesser sandstones and siltstones displaying rhythmic bedding, typical of turbidite deposits.

[3] The Bude Formation is calculated to be around 1.3km thick along the north coast and consists of silty sandstones and mudstones.

[4] The Bealsmill Formation is at least 120m thick and consists of interbedded sandstones, siltstones and mudstones with some conglomerate beds containing chert, lava and limestone clasts.