That pairing of yin and yang shape is very frequent - http://www.themodernantiquarian.com/image.php?image_id=12695 . Often the pair are closer than this ! In the type of stone rows where there's a double line of upright stones, close together, it's possible that they were paired as black and white/male and female.
Other than that I'd describe Rock Art found in the Pennines as 'very dull'. It's the best evidence for supposing that the dour bluntness of the population was well established back then.
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