Page 39 - TVH 2000 Anniversary Shipwreck Project

At a depth of 2.5 m below seabed level the concretions became so numerous that we could not excavate between them and would have had to resort to breaking them up. To loosen these, it would have been necessary to undermine them from the north and the east and this was felt to be inappropriate. The concretions left were unbroken and solid, without any protruding organic objects. They form a naturally hard layer and it was felt that these should be left, protecting any organic material that may lie beneath. B2B B1B Transom 0m Mobile Backfill Spar A0035 Transitional 2m 1m Disturbed Silt with shells Clay with shells Clay Concretion Undisturbed B0B B1B B2B Med. sand & shells Med. sand Wood Transitional Section Figure 10: Stratigraphy trench 1 The stratigraphy outboard can be described as: • Backfill and mobile modern sediments • Transitional- the break up of the vessel and contents • Undisturbed sediments – sand constituting 18th century seabed - 33 -