ARCS1001 Lecture Notes - Lecture 12: Polyethylene Glycol, Dokos, Subsidence
31 Jul 2018
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Part 1: types of sites: waterlogged soil sites, freshwater sites. Sunken towns, submerged landscapes: rubbish dumps at sea. Sites in the tidal zone (periodically under water) Freshwater: may be in caves as well, ancient lake villages of switzerland- houses on stilts in the lake, artefacts excavated from lake sediments. Week 13 lecture: river currents can be dangerous. Used as a burial place by prehistoric native americans: excellent preservation- clothing, tools, bones, even human brains. Peat bogs: wetland areas dominated by sphagnum moss plants. + chemical preservative (tannin molecules in the water from the breakdown of sphagnum moss: ta(cid:374)(cid:374)i(cid:374)s (cid:396)eta(cid:396)d (cid:373)i(cid:272)(cid:396)o(cid:271)ial g(cid:396)o(cid:449)th a(cid:374)d (cid:272)a(cid:374) p(cid:396)ese(cid:396)(cid:448)e (cid:894)o(cid:396) (cid:858)ta(cid:374)(cid:859)(cid:895) o(cid:396)ga(cid:374)i(cid:272) (cid:373)ate(cid:396)ial su(cid:272)h as hu(cid:373)a(cid:374) skin and hair -> bog bodies. Most of the track covered over and left in situ in the wetlands which are now a national. Wells: excavation can be extremely dangerous, confined space risk of drowning lack of oxygen at depth.
