Abstract
The faulted preservation of a complete Jurassic-Cretaceous succession in the Brittany Basin is primarily the result of early Cretaceous rifting throughout the Western Approaches Trough. Jurassic and Cenozoic strike-slip deformation has also contributed to the distribution of sedimentary successions now observed. Consequently, the Brittany Basin has a different burial/uplift history to the adjacent basins of the Western Approaches, making the Lias (Lower Jurassic) a mature source rock. Reservoir rocks are present, but the unique deformation history has resulted in the late formation and possible breaching of structural traps. The sedimentary record from the Brittany Basin allows us to observe the depositional effects of tectonic events occurring elsewhere in the Western Approaches Trough. These suggest Middle Jurassic, early Cretaceous, late Cretaceous and Cenozoic uplift events: each have different structural effects. The origin of the most prominent intra-Mesozoic unconformity throughout the Western Approaches Trough, the early-mid Cretaceous, is discussed with reference to causes of juxtaposed uplift and renewed rifting.
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