Photo 9, steeply tilted Late Cambrian to Early Ordovician sediments in the north face of Carnedd y Filiast, near Bethesda, Snowdonia. These rocks were originally laid down as submarine turbidites and shallower marine sediments within the Lower Palaeozoic Welsh Basin, but have now been tilted and folded by the Late Silurian to Early Devonian Acadian phase of the Caledonian Orogeny.
The mountains in the distance are mainly composed of younger, Ordovician volcanic rocks and interbedded sediments, which were also folded in the Caledonian Orogeny, although their final uplift to form the mountains we see today probably occurred much later in Mesozoic and T ertiary rifting events which led to the opening of the North Atlantic Ocean.
Photo 9, steeply tilted Late Cambrian to Early Ordovician sediments in the north face of Carnedd y Filiast, near Bethesda, Snowdonia. These rocks were originally laid down as submarine turbidites and shallower marine sediments within the Lower Palaeozoic Welsh Basin, but have now been tilted and folded by the Late Silurian to Early Devonian Acadian phase of the Caledonian Orogeny.
The mountains in the distance are mainly composed of younger, Ordovician volcanic rocks and interbedded sediments, which were also folded in the Caledonian Orogeny, although their final uplift to form the mountains we see today probably occurred much later in Mesozoic and T ertiary rifting events which led to the opening of the North Atlantic Ocean.