AR101 Lecture : Relative dating, calendars & historical records.docx
26 Aug 2013
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Ad = anno domini & the year of our lord. Bce = before the common era ad622. Bp = before present; before 1950 & years ago. Tell only if one specimen is older or younger than another. Dates are expressed relative to one & another rather than in absolute terms (eg. earlier,later) Time markers: artifacts shown to be diagnostic of a particular time period: eg. colonia era pipes generally broke within a year. Their shapes, decorations, stem lengths & thickness changed throughout the. Stem bones become smaller in more recent specimens: american, nels nelson selects san cristobal, new mexico- a site with deep stratigraphic layers to investigate the changing sequence of artifact types. Allowed the identification of 3 ceramic time markers while also providing a master sequence that could be used to place others, based on the presence of similar ceramic types into the chronological sequence of the region.
