Used in radiocarbon dating
Used in radiocarbon dating - Phonesex chatroom sa
We count the types of musical recording methods found in each of our junkyard samples, and then work out the percentages.
Petrie knew that styles of pottery seemed to come and go over time--in his case, he noted that some ceramic urns from the graves had handles and others had just stylized ridges in the same location on similarly shaped urns.Archaeologists call this kind of behavior "curation" -- people then, just like today, like to hang on to old things.But you would never have any 78s in junkyards closed before they were invented.He assumed that the change in styles was an evolutionary one, and, if you could quantify that change, he surmised it might be used to indicate which cemeteries were older than others.Petrie's notions about Egyptology, and archaeology in general, were revolutionary.Microsoft Excel (TM) has created for us a lovely stacked bar graph for us.
Each of the bars in this graph represents a different junkyard; the different colored blocks represent percentages of artifact types within those junkyards.Using seriation at our hypothetical junkyard sites, we will try to establish the chronology--the order in which the junkyards were used and closed.To start out, we will take a sample of the deposits in each of junkyards.The same is true for 45s, and 8-tracks, and cassette tapes, and LPs, and CDs, and DVDs, and mp3 players (and really, any kind of artifact).For this seriation demonstration, we're going to assume that we know of six junkyards (Junkyards A-F), scattered in the rural areas around our community, all dated to the 20th century.Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented (most likely) by the Egyptologist Sir William Flinders Petrie in the late 19th century.