These features of microtopography are characteristic of solutional weathering of limestone, or karst geomorphology. The striations at the top left of the image show where tiny irregularities and the physics of water combine to convert laminar (sheet) flow of rainwater over the rock surface into channelised flow; the resulting miniscule channels, or rills, are analogous to larger gullies on hillsides.
This preferential flow will cut back the bottoms and sides of the rills faster than the 'peaks' between the rills, so they become deeper and wider, developing to the form visible in the middle of the image.

In many parts of the world, including elsewhere in the UK and even elsewhere on Ingleborough, such an exposure would be protected from the erosion of human contact, but Ingleborough has so much limestone pavement that this is an unregarded part of the footpath.