Gently
folded Carboniferous limestone at Scarlett. This folding probably
occurred during the Variscan mountain-building event approximately
290 million years ago.
These
very contorted layers are small folds within the Manx Group at Niarbyl.
The broad curving surface in the middle of the photo is a layer
of sediment that was originally horizontal. Some 410 million years
ago, these beds were trapped between converging continents during
the Caledonian mountain-building event, producing large folds like
these ones within the Dalby Group, Peel Hill.
Faults
This fault, which has white quartz along it, separates the Ordovician
Manx Group (around 470 million years old) from the Silurian Dalby
Group (around 425 million years old). These two groups of sediments
were eroded from continents on opposite sides of the Iapetus Ocean.
This view shows Peel in the low-lying area with Peel Hill behind
it. Peel has been built on approximately 380 million year old Peel
sandstone while the rocks that make up Peel Hill are part of the
much older 425 million years old Dalby Group. In most circumstances,
younger sediments should appear above older ones but around Peel,
the younger Peel sandstones have been dropped down by a large fault
which runs N-S, parallel to the ridge of hills in the distance,
so that they now lie next to each other.