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Watching Brief

Date 1992

Event ID 1036367

Category Recording

Type Watching Brief

Permalink http://canmore.org.uk/event/1036367

As a condition of Scheduled Monuments Consent a watching brief was carried out during the digging of three test pits to assess the viability of laying a new gas main across the bridge which was originally constructed in c1500. A pit was dug over the centre of each bridge arch to determine he depth of cover. All pits were 1m square and dug in the centre of the carriageway. In the N pit a sequence of 5/6 old road surfaces overlay the sandstone arch structure, 0.44m below ground surface. The centre pit cut through a similar sequence of road surfaces to a depth of 0.60m, at which level was a surface of substantial black rounded cobbles, most likely marking the old county boundary which ran along this line. In the S pit, the old road surfaces had been scalped off and the modern tarmac and make-up lay directly over the bridge structure at a depth of 0.18m.

Sponsor: British Gas (Scotland) plc.

M Collard 1992.

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