The Cracoe Reef Knoll - a Yorkshire scene millions of years in the making

It is part of the Cracoe Reef Knoll, a series of conical hills lying along the side of the valley running from Grassington towards Skipton.

As the Yorkshire Dales National Park Authority website explains, the hills are remnants of an ancient coral reef.

“These hills are the remains of ancient reef knolls and were once colonies of coral and algae lying in shallow tropical seas over 300 million years ago,” it says.

“Their fossilised remains have become the limestone that makes the soil so rich.”

In a recent blog post on his website, Tim Barber, of Real Yorkshire Tours, wrote: “In Cracoe the knolls include Thorpe Kail, Elboton, Myrah Bank Stebden, Skelerton and Butter Haw hills and in Malham the Reef Knolls include Cawden, which can be seen from the village as well as Wedber & Burns Hill.”

On Elbolton Hill, its bright green grass – caused by the rich limestone under the ground – contrasts strongly with the brown moorland behind. That contrast has led to magical myths about the fairies of Elbolton, who led unwary travellers astray on foggy nights with “corpsie lights”.

Elbolton also has a cave system which was excavated around 100 years ago.

Archaeologists found prehistoric skeletons and pottery, now in collections at Craven Museum in Skipton.

The Yorkshire Dales are blessed with several sets of reef knolls, including one set located around Malham and another around Settle but they are not unique to this part of the country.

Other examples can be found on the Derbyshire/Staffordshire border.

The hills are a source of great interest to geologists and fossil hunters – and offer a reminder of how life has changed on the planet over millennia.

Technical details: Nikon D4, 80-200mm Nikkor lens, 1/640th second @ f5.6, ISO400.

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