英和和英

出典:『Wikipedia』 (2010/11/14 23:02 UTC 版)

英語による解説

引用

Scroll Trench, also called Arc Trench, is a 25 ft (7.6m) long by 9 ft (2.7m) wide curved cutting into the Late Cretaceous (Santonian Age) Seaford Chalk formation at Stonehenge in England. Located within the (southern) Avenue, it begins as a shallow disturbance over Stonehole B (WA 3606) increasing in depth east-northeast as it scrolls-arcs to the East deeper, its final depth being unknown. This broad feature cuts perpendicular through Heelstone Ditch whose segment is missing there in its curved path towards Stonehole 96 (WA 163), the Heelstone. It is exceedingly deep (6 ft, 1.8m) where it crosses just East passed the missing segment of Heelstone Ditch (average depth: 4 ft, 1.2m). Entirely cut away is Heelstone Ditch's lower-half fill of Early Carboniferous (Arundian Age) High Tor Limestone and its upper-half fill of silted-in periglacial cryoturbated chalk. Scroll Trench's backfill soil is a mixture of both lithologies and stone chips of all Stonehenge period varieties, indicating it postdates their occurrences. Stratigraphic sequence runs Scroll Trench - Stonehole 97 - Heelstone Ditch - (southern) Avenue Bank, from most recent to earliest. Lt-Col William Hawley found Scroll Trench in his "Excavations at Stonehenge during the season of 1923";