I found the formation that people have been reporting. It is in the same field about 100 m north of the Cross formation and one tramline east of the one through the centre of the cross. The map reference is approx SU121655. You may find this appears to be south of the location you have for the Cross formation but I think you have the map reference for that about 400m north of its actual location. I have attached a selection of ground shots, but the quality is not too good because it was too dark when I got there. I am going to try and get aerial photos first thing tomorrow morning.