|
Most of the rocks that now form the surface of the Peak National Park were laid down in the Carboniferous period of geological time. The three main rocks are:-
Limestone, in the south and centre of the Park, forming the White Peak;
Millstone Grit, forming a horseshoe shape around the Park, which is called the Dark Peak;
Shale, a softer rock which lies at the foot of the Millstone Grit edges and forms the fertile valleys of the Park.
| GEOLOGICAL TIME SCALE |
NUMBER OF YEARS AGO |
| CENOZOIC |
QUARTERNARY
|
Recent
Pleistocene
|
10,000
1m |
| TERTIARY |
Pliocene
Miocene
Oligocene
Eocene
Palaeocene
|
10m
25m
40m
60m
70m |
| MESOZOIC |
Cretaceous
Jurassic
Triassic
|
135m
180m
225m |
| PALEOZOIC |
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
|
270m
350m
400m
440m
500m
600m |
|
|
4,500m |
|