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As discussed in Chapter 11 of this report, some authors have considered that the uppermost part of the Southern Highland Group of the Dalradian in Scotland might be Lower Palaeozoic, possibly Early Cambrian to Early Ordovician. The age of the Irish Dalradian is also not fully clear (Daly 2001). Thus, in Ireland, strata that are clearly Cambrian in age are restricted in outcrop, being con?ned to some areas of the SE (Fig. 17) in the Leinster Terrane (Murphy et al. 1991; Woodcock 2000; Holland 2001, 2009). There they comprise the Bray and Cahore groups and part of the Lower Palaeozoic Ribband Group (Figs 18 & 19). In addition, in southernmost Leinster (Fig. 20), palynological studies have now shown that the Cullenstown Formation, which is not assigned to any of these groups, is also Cambrian. In the same area, the Ballycogly Group mylonites, which occur along the boundary between the Leinster Terrane and the Precambrian basement of the Rosslare Terrane, are considered to be Cambrian (Tietzsch-Tyler & Sleeman 1994a) although there is no direct biostratigraphical evidence.

The Leinster Terrane is made up of several sub-terranes: particulars of these and the relevant references are given in Chapter 6 of this report. Within these terranes, Brack et al. (1979) grouped the Lower Palaeozoic rocks into three belts. More recent work has shown that, as far as the Ribband Group is concerned, a fourth belt can be established (McConnell et al. 1999).

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