It is part of the Early Pennsylvanian / Upper Carboniferous period.
2.
Geologically, the region is defined by coal-bearing layers from the upper Carboniferous period.
3.
Previously, the Oegophiurida were known only to exist from the lower Ordovician to the upper Carboniferous periods.
4.
To the extreme east is the Red Rock fault, and the older rocks from the Upper Carboniferous period surface.
5.
They were formed during the Caledonian orogeny of the Silurian period and then rejuvenated in the Hercynian orogeny of the Upper Carboniferous period.
6.
""'Tylopterella " "'is a genus of prehistoric eurypterid which lived from the Ordovician to the Upper Carboniferous period.
7.
To the south-east of the area is the Millstone Grit laid down in the Upper Carboniferous period, and covered by heather moorland, hard crags and tors.
8.
The oldest rocks, from the Upper Carboniferous period, are sandstones and shales of Millstone Grit present as outcrops and uplands in the north-east of Greater Manchester, such as the upland moors of Dark Peak and South Pennines to the east and northeast of Rochdale, Oldham and Stalybridge.
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