Marked on the 1:25000 'Explorer' map as 'Chapel Stone'. Burl suggests this is the remains of a four poster, but it would be unusual to find one in these parts. MacLeans "Standing Stones of the Lothians" states that there are indeed four stones (all fallen) about 5 to 6 foot long. Another site closed due to FMD.
An entry from Ancient Stones, an online database that covers most of the standing stones, stone circles and other stones found in South East Scotland. Each entry includes details, directions, photograph, folklore, parking and field notes on each location.