The enclosure is irregular in shape, suggesting that it was not the outline of a building. See Link
for an annotated satellite view; the enclosure shown in this photo extends eastwards from the northernmost violet marker for a distance of about 30 metres.
The slopes in the background lie on the far side of the Spouts Burn (which is joined not far downstream by the Black Burn to form the Garshake Burn).
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The violet markers on my annotated satellite view, mentioned above, outline much fainter remains, presumably from another time period (since they overlap the enclosure shown here). These fainter remains are not shown in this photo; in fact, they were only visible on the satellite view; in contrast to the enclosure, I could not detect any traces of them on the ground.
The markers outline a rectangular area, 80 metres long by 30 wide, with the long axis oriented NW-SE. Evidently, this once contained eight square structures of equal size (9m×9m), arranged as if in two rows of five, except that the middle structure of each row is missing (thus leaving two groups, each consisting of four squares). Like so (may not work on all browsers):
In addition, some long concrete blocks were visible only a few metres away, among the grass: NS4278 : Concrete blocks
; the only other concrete blocks in the area are to be found at a nearby Starfish Decoy site (see Link
for details), so these blocks appear to date from the Second World War. Note also that the enclosure shown in this photo is less than 100 metres from a pair of bomb craters; see NS4278 : Water-filled bomb crater
One possible interpretation is that the fainter but more regular traces (those that are now only visible on satellite imagery) show where some WWII structures, associated with the nearby concrete blocks, stood, and that these structures were built upon the site of a much older enclosure (the larger and more irregular feature whose corner can be seen in the photograph).