"The Roundel [at Greenloaning] is a round cairn, 100 yards in circumference and about 5 or 6 ft. high, around whose edge are planted seventeen beeches. There are many small boulders visible, but no central cist or peristalith of curbstones. The field was under grass in 1936 but showed evident signs of former arable." (Crawford 1949)
The Roman genesis of this earthwork is hinted at by the finding of a stone in 1822 reputedly inscribed with the Latin letters VERSAMEBONOTVO "overturn me to your own advantage", but there is reason to believe that the provenance of this text is suspect. The possibility that the stone is a forgery has led to its exclusion from the R.I.B., but its existence should nontheless be noted.
Rediscovered from the air in 1986, the site was excavated in 1995 which revealred a four-post rectangular watch-tower measuring 17¼ ft. by 14 ft. (5.25 x 4.25 m), with a base of sandstone slabs surrounded by a rampart of gravel and clay with an entrance gap to the north-west. The inner ditch averaged 6¼ ft. wide by 1¾ ft. deep (1.91 x 0.52 m), the outer 4¾ ft. wide by 1¼ ft. deep (1.45 x 0.4 m).