Amazing conglomerate rock at Dunnottar Castle

I spotted that the cliffs were like this on the way in and I wondered if the cliff face has been patched up by humans. It doesn't look like natural rock. But a look at the guidebook confirmed that it is a genuine conglomerate rock. The large round pebbles are held together by a natural salt cement. It must be very effective because that lump of rock has resisted the eroding power of the sea and has a large castle on it. The pebbles in the rock are rounded. That means that they had been transported a large distance before settling. Perhaps these were pebbles on the beach of an ancient sea. It is very different from the brockram conglomerate in the Eden Valley which has angular rocks in it. That rock had only travelled a few miles so was not rounded much by transport.