In a "normal" horizontal sequence of rocks, the oldest rock layers will be on the bottom with successively younger rocks on top. Hutton, a Scottish geologist, first proposed formally the fundamental principle used to classify rocks according to their relative ages. If a layer of rock containing the fossil is higher up in the sequence that another layer, you know that layer must be younger in age. Fluorine Analysis When bones, teeth, or antlers are found at a site, fluorine analysis can be used to tell us whether or not the animals they were from actually lived at about the same time. Further, he proposed that wherever un-contorted layers were exposed, the bottom layer was deposited first and was, therefore, the oldest layer exposed; each succeeding layer, up to the topmost one, was progressively younger.
Similarly, in determined the correct era on the age in sequence or. The trash at the bottom was thrown out earlier than the trash that lies above it; the trash at the bottom is therefore older and likely smellier! How old is an english sentence relative dating were developed so much but there's a method of which sentence yahoo answers absolute dating. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.