Ballochroy

The three mica schist stones were measured at 11 ft 6 in, 9 ft 10 in and 6 ft 7 in (3.5, 3.0 and 2.0 m) in height. The smallest stone may have been broken off at the top. The line of stones is oriented north-east to south-west.

The flat face of the central stone, at right angles to the alignment, indicates the mountain of Cora Bheinn, on the island of Jura, which is 19 miles (30 km) away. The shortest stone also faces across the alignment and points to Beinn a' Chaolais, the southernmost of the three Paps of Jura. The sunset would have given a warning of the approach of the solstice.

Alexander Thom maintained that the great length between the stones and the features of the distant landscape lent precision to pinpointing the midsummer and winter solstices for ancient observers, indicating that the monument was used as an astronomic calendar. As with many megalithic sites, the current theories concerning the exact use of the stones at Ballochroy are somewhat controversial.