1. Ice moulded forms and possible roche moutonnee -- Round Island and St Helen's Island in the far north.
2. Ice scoured rock surfaces near Shipman Head, Bryher
3. Morainic ridges on Bryher
Hiemstra et al refer to a morainic ridge on the eastern side of Shipman Head; I was unable to examine that for lack of time. But there are others not far away:
4. Morainic ridges -- White Island Bar and Pernagie Bar. There is also a curvilinear offshoot on the east side of the latter bar. These ridges look at first sight like tombolos, formed by longshore drift and beach processes to link inshore islands to the mainland. But they are much more complex than that, and the visitor is immediately struck, on examining them, by the multitude of erratic pebbles and boulders which litter their surfaces and buy the core of clay till which is sometimes exposed at low water. I agree with Hiemstra et al (2006) that these ridges are remnants of morainic ridges left by a lobe of ice that pressed into the shallows between White Island and Pernagie Island from the north-west. They are not necessarily parts of a terminal moraine, because the Devensian ice certainly extended further to the south at the peak of the glaciation. They may represent a retreat stage (or stages) or short-lived readvance of the ice edge.
5. Golden Ball Brow, on the west side of St Helen's, is also interpreted as a morainic feature, marking a former ice edge. In fact, Hiemstra et al speculate that there is a double ridge here, formed by two ice edge stillstands. I cannot comment on these features because I have not examined them.
6. Elongated moraine ridge at the northern extremity of St Martin's, near the pebble maze and on the south side of the footpath. Above the ridge there is a slope leading to the Rabbit Rocks. This ridge is quite prominent, and I find it convincing as an ice edge feature probably associated with the White Island Bar and Pernagie Bar moraines. Hiemstra et al (2006) refer to a number of smoothly crested symmetrical ridges 2-3 m high and up to tens of metres long. I did not observe these, but wonder if they might be storm beach features in what is a very exposed location?
7. On the gentle slopes facing Great Bay, Hiemstra et al (2006) refer to breaks of slope and asymmetrical ledges associated with small kettle-like depressions. They interpret these as "remnants of ice-contact slopes" linked to an old ice edge position. I did not have time to look at these features so I cannot comment on that interpretation.
8. Ridge like expressions are also referred to by the same authors on St Martin's towards Bread and Cheese Cove. I looked quite carefully at this area, but found nothing that might be interpreted as glacial landforms. But I do agree about the presence of clay till in the exposures at the head of the bay!
9. Ice-moulded tors
Scourse and other authors have argued that one way of distinguishing the glaciated from the unglaciated parts of the Isles of Scilly is to look at the shapes of the granite tors that are found on all of the islands. They argue that delicate pinnacles and balanced rocks could not have survived gklaciation, and so where they exists they must have lain beyond the Devensian ice edge. On the other hand, tors with subdued forms might indicate submergence beneath Devensian ice, and might signal a certain amount of damage or "cleaning up." I am not too sure about this, having oberved teetering tors inside the ice limit and subdued forms outside it! Many other factors are at play in determining the forms and fragility of tors, so on this matter I shall reserve judgment.......
Interestingly enough, the subtle and subdued depositional features on the Scillies are reminiscent of those on Gower and in Pembrokeshire............ but where are the fluvioglacial deposits and landforms? They must have existed. Could it be that they were all in the lower areas which are now submerged and destroyed beneath the sea?