Heelstone Ditchとは 意味・読み方・使い方

Heelstone Ditch is a roughly circular earthwork having steep sloping sides which end at a narrow flat base, being approximately 4 ft (1.2m) deep and 3.5 ft (1.1m) wide. It is located in England at Stonehenge around its outermost sarsen, the Heelstone (Stonehole 96). The ditch was cut into Late Cretaceous (Santonian Age) Seaford Chalk, the formation which geologically crops out at Stonehenge. It is some 12 ft (3.7m) from Heelstone's base, having a diameter of roughly 32 ft (9.7m). A broad arcing trench found in 1923 by Lt-Col William Hawley 9 ft (2.7m) wide cuts this ditch from the West, deepening towards the stone. Against the Heelstone Ditch (inside circle) is rammed chalk filled Stonehole 97, whose missing stone is known as Heelstone's twin. Stratigraphic sequence of these features, from earliest to latest, runs (southern) Avenue Bank - Heelstone Ditch - Stonehole 97 - Scroll Trench.