The wonderful HEIR Project in Oxford has prompted me to follow up my previous post about Avebury. I showed two images there, said to be dated 1895 (a photo) and November 15–18, 1895 (a painting). HEIR helpfully pointed out in a tweet that Underhill dated the painting August 23 1895, which makes more sense than November, and suggests he may have made it on site rather than from his photo (notwithstanding his stylised flowers, which he seems to have rather liked in his paintings). The ADAS images are in fact from their archive, where there are more old Avebury shots.
Among them are these two above, taken by AD Passmore in 1922 on the course of the West Kennet Avenue, looking west just south of the A4 (over the hedge on the right), west of the turning south to East Kennet and not far from the Sanctuary.
On the left you can see Passmore’s attempt to show four fallen, mostly buried megaliths. You can also see the closest in the shot on the right, near the fence top right. In the foreground is a completely buried sarsen he’d found by probing with a steel bar. He described this in the Wiltshire Archaeological Magazine in 1926 (it was 10ft 7in long), illustrating his dig with this drawing below – the photos add quite a bit! Isobel Smith called this stone 83b. It should still be there, under the ground. As far as I know, that’s it for any excavation that’s occurred in that area.