Managed to follow-up my exploring around the Fontburn Reservoir area. These findings are in the area S of the Fallowlees Burn, W of the main cup-marked boulder described by Beckensall as Fontburn b. There is little surface rock on much of the moorland and there also appears to be some limestone in the SE which may account for natural erosion patterns on some rocks, the presence of sink holes in some areas, and the location of the reservoir.
Hob's grooved boulder, at the centre of a denuded cairn, is located further E of his reference within the enclosure that is crossed by the wall. The grid reference is approximately NZ 027 936. It lies just below a prominent double knoll E of the bridlepath which turns from a junction to run (largely invisible on the ground) in a NW direction.
Further W, a rock with clear cup-marks (see photo) lies within the rectangular improved field at grid reference NZ 01667 93254, close to the line of bridlepath, about 60m S of a gate in the NW fence. This small, flat rock is, I think, previously undescribed. It bears 2 deep and up to 3 shallow cups. It may also have come from a cairn, now dispersed. The field contains other small cairns (which may be from field clearance) and enclosure banks.
Near to the point that the Fallowlees Burn emerges from the gloom of the conifers of Harwood Forest there is, about 10m N from a prominent bend in the stream, a large, rounded boulder perched on a bed of what looks like horizontal limestone (NZ 01277 93129). It is probably a stone perched by glacial action. Markings on the top surface are probably natural erosion.
If these new markings are confirmed, the cup-marked stones in the Fallowlees/Fontburn region appear to lie on both banks of the Burn marking its course from the W. Marked rocks appear again SW of the Forest in the intricate cup and ring markings of Tod Crag which has been suggested may lie on the course of an old routeway.