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Dorchester Pot
The Dorchester Pot was a metal vase-like object that was recovered in two pieces after an explosion used to break up rock at Meeting House Hill, in Dorchester, Massachusetts in 1852. According to text reprinted from the ''Boston Transcript'', a local paper, in the June 5, 1852 ''Scientific American'',〔 the two pieces were found, loose among debris thrown out by the explosion. Apparently, it was inferred from the locations of the two pieces of this pot among the explosion debris that this pot had been blasted from solid puddingstone (conglomerate), which is part of the Roxbury Conglomerate, from about 15 feet below the surface of Meeting House Hill. The story has been used by creationists and fringe theorists as evidence that conventional models of geology or the length of the human presence on earth are wrong. Mainstream commentators identify it as a Victorian era candlestick or pipe holder.
==Geological context==
The Roxbury Conglomerate, from which this pot is alleged to have come, has been dated as having accumulated between 570 and 593 million years ago and during the Ediacaran Period.〔Thompson, M.D., A.M. Grunow, and J. Ramezum, 2007, ''Late Neoproterozoic paleogeography of the Southeastern New England Avalon Zone: Insights from U-Pb geochronology and paleomagnetism.'' Geological Society of America Bulletin. 119(5/6):681-696.〕〔Rehmer, J., 1981, ''Squantum tilloid Member of the Roxbury Conglomerate of Boston, Massachusetts.'' in M.J. Hambrey and W.B. Harland, eds, pp. 756-759, Earth’s Pre-Pleistocene Glacial Record. Cambridge University Press, Cambridge, United Kingdom.〕 It accumulated at the bottom of a deep rift basin, which was filled with marine water, within submarine fan and slope environments.〔〔Socci, A.D., 1990, ''Stratigraphic implications of facies within the Boston Basin.'' in A.D. Socci, J.W. Skehan, and G.W. Smith, eds, pp. 55-74, Geology of the Composite Avalon Terrane of Southern New England. Special Paper no. 245. Geological Society of America, Boulder, Colorado〕〔Carto, S.L., and N. Eyles (2011) ''Chapter 43 The Squantum Member of the Boston Basin, Massachusetts, USA'' In: E. Arnaud, G.P. Halverson, and G. Shields-Zhou, eds. pp. 475-480, The Geological Record of Neoproterozoic Glaciations. Memoirs no. 36. Geological Society, London, England.〕 Metamorphism has significantly altered the Roxbury Conglmerate to subgreenschist facies and created within it a well-developed and closely spaced slaty cleavage that is oriented approximately perpendicular to bedding. Tectonism has also flattened, stretched, indented, and fractured the pebbles and associated matrix of the Roxbury Conglomerate to the point that it often has the appearance of flow structure.〔〔Mansfield, G. R., 1906, ''The Origin and Structure of the Roxbury Conglomerate.'' Bulletin of the Museum of Comparative Zoology at Harvard College. no. XLIX, p. 180〕
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