Geology
The hill is an outlier of the North York Moors uplands. It is formed from sandstone laid down in the Middle and Lower Jurassic periods, between 208 and 165 million years ago, which constitutes the youngest sandstone to be found in any of the National Parks in England and Wales. Its distinctive conical shape is the result of the hill's hard sandstone cap protecting the underlying shales and clays from erosion by the effects of ice, wind and rain.
Until 1912, the summit resembled a sugarloaf until a geological fault and possibly nearby alum and ironstone mining caused its collapse. The area immediately below the summit is still extensively pitted and scarred from the former mineworks. The summit has magnificent views across the Cleveland plain as far as the Pennines on a clear day, some 40 to 50 miles (60 to 80 km) away.
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