The following is a classification by Brück & Molyneux (2011). • The
Askingarran Formation forms a continuation of the Ribband Group which overlies it. Its top is
faulted against the
Tremadocian Ballyhoge Formation of the Ribband group. It is made up of black and grey laminated
siltstones and
mudstones with occasional green
beds and common internal and external turbidite structures. It correlates with the Booley Bay Formation at Booley Bay and Clammers Point. These two formations comprise the oldest strata assigned to the Ribband Group. • The Polldarrig Formation of the Cullenstown Group (which stretches north-eastwards from
Cullenstown Strand to
Wexford town) is made up of grey and green, fine grained, laminated
greywackes and
shales and is the local equivalent of the Booley Bay Formation. • The
Booley Bay Formation comprises much of the northern part of
Hook Head (south County Wexford) and extends west of
Waterford Harbour (
County Waterford). • The
lithologies of the
Cahore Group are indistinguishable from those of the Booley Bay Formation. The group passes up northwards into the Ribband Group and the boundary between them is faulted. Unlike the Ribband Group, which extends into the Ordovician, it is entirely Cambrian. • The
Maulin Formation (Counties
Wicklow and
Carlow) stretches 100 km southwards from
Dublin Bay to
County Carlow. It is made up of Ribband Group lithologies and includes dark grey
phyllites, slates and thin grey
quartzites. It is 900m thick in northern County Wicklow. The Ballymadder
Shear Zone (just east of
Hook Head on the coast of south
County Wexford), separates a to some extent different Cambrian succession immediately to the east to the one to its west. To its west the Clammers Point Unit (in the
Bannow area) exposes a coastal section comprising Cahore Group and Ribband Group sediments. ==See also==