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The first of our journeys is along the River Tees. The Tees has its headwaters way up in the Pennines, in the Carboniferous rocks just east of Cross Fell, but downstream of Cow Green Reservoir it cuts through some of the oldest rocks in Northern England – that’s why its the first or the rivers in this series. On our way downstream we will explore some different bits of the Whin Sill and some rocks it baked, the making pencils from ancient slates and take a closer look at High and Low Force, iconic sites of the Northern landscape. But let’s head for Widdybank Fell near the dam at Cow Green.