We went to look at the Long Meg stone circle. The stones represent a variety of rock types. Two were of the local conglomerate type rock called Brockram, a breccia made of large clasts. My geology teacher once took me to a quarry near Appleby of this rock having first taken me up to the limestone up at Great Asby Scar. He said that when our continent was at the latitude of the Sahara, weathering produced big chunks of limestone. These were then washed a mile or two down wadis during floods and then nestled amongst sand to form a desert sandstone. The clasts are angular and large because they have not been transported far. You might want to try
https://www.bgs.ac.uk/downloads/start.cfm?id=2894
