Calf Rock and Roll EarthCache
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A short distance from a parking area near Ilkley in Yorkshire
The Cow and Calf consist of a cliff face and a very large rock (the Calf) that has fallen off the cliff and rolled down the hill.
Check this out for a modern day occurrence
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Millions of years ago, these rocks were under the sea, and they are formed of what is called Millstone grit. Millstone grit is a type of sedimentary rock. That means it was formed from sediments – finely ground sand or gravel that washed to the bottom of the sea. Sedimentary rocks are formed of thin layers. Since these thin layers formed on the sea bed, you might expect them to all be level. But this is not the case. After the sediments had been laid down and had formed the rock, these sedimentary rocks were often moved around and tipped up by later movements of the earth’s crust. So today many sedimentary rocks are far from horizontal and level. Look for the sedimentary layers in the cliff above, and in the Calf rock too.
The Millstone grit rock was used in more recent times to make mill stones for grinding corn. The rock used for mill stones has to be hard wearing and abrasive so that it can last for many years, and grind down the grain into flour.
Where did the Calf Rock come from?
If you look at one side of the Calf rock you will see the initials JS carved in the rock. To the left of this you will see a long oval shaped hole. To the left of the oval shaped hole there are two smaller holes that look a bit like a shoe print – the heel and sole of a shoe.
NOW look up on the cliff above for that same pattern of the oval hole and the “shoe-print”. If you look carefully you will see an exact mirror image of these shapes. Since the calf rock has fallen and turned over, the holes are not at the same angle as those on the cliff. Can you spot where the oval hole and shoe print match up? This is the precise location from which the huge Calf rock fell.
In order to claim this as a find, you have to answer two questions and post a photo of Calf Rock, with you and GPS (if you have a camera with you).
The questions are:
1. How many paces is it round the base of the Calf rock?
2. Looking at the original position of the rock on the cliff, and its current position now, how many times do you think the Calf rolled before coming to a stop? As accurate as possible please.
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