From Dick Milliard:

An intrepid (brave? foolhardy?) group of seven of us spent most of the morning in the Old Town Railway Cutting in Swindon, clearing vegetation from the rocks in two locations.  We finished with most of the job done, at the point when the rain made it rather hazardous underfoot.

The left hand column of pictures shows, from the bottom, the Glauconitic Sand Beds, the Lower Cockly Beds, Upper Cockly Beds and some of the Swindon Sand and Stone series.  The Cockly Beds are full of shells and shell fragments.

In the right hand column, you can see the Glauconitic Sand above the very top of the Swindon Clay.  The clay is impermeable, and so water that seeps into the rock above runs out at the level of the clay.  This accounts for the springs along the path.

My thanks to the team for doing a good job in tricky conditions.