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No. 2,611 — Cowpon MarshTownship of Billingham, Durham Sheet 51 of 19thC Ordnance Map. Lat. 54° 36' 24", Long. 1° 12' 30". [ OS Grid Ref: NZ 51130 23801 (451130,523801) ] Account of Strata passed through in No. 1 Diamond Bore-hole put down on Copwon Marsh by Mr. John Vivian for the Newcastle Chemical Works Company, Limited, 1885 Approximate surface level 10 feet above sea (Ordnance datum)
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