Abstract
The Ballydeenlea Chalk Breccia, Co. Kerry occurs as an outlier surrounded by Namurian rocks and is composed dominantly of Namurian mudstone clasts, with Cretaceous (Campanian) chalk acting as a matrix. A new model is proposed for the formation of the deposit in which it is considered to be the remnant of a suite of sediments deposited at the foot of a submarine fault scarp, active during the Campanian. In this model, Namurian mudstones comprised the active scarp and were redeposited by rockfall events. These were mixed with unlithified chalk ooze derived from slumping from the upthrown side of the fault. An organic maturation study of the Ballydeenlea Chalk Breccia indicates a maximum burial depth of between 1 and 1.5 km, suggesting uplift and erosion during the early Tertiary.
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