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By carefully digging, we have found that each trash pit shows a sequence of layers.Although the types of trash in each pit is quite variable, each layer has a distinctive kind of trash that distinguishes it from other layers in the pits.
Relative dating by biostratigraphy is the preferred method in paleontology and is, in some respects, more accurate.Prior to the late 17th century, geologic time was thought to be the same as historical time.Archbishop James Ussher of Armagh, Ireland, 1654, added up generations from the Old Testament and determined that Earth formed on October 23, 4004 BCE.You have to date the volcanic layer above and below the fossil layer.The age of the fossil will be an age range between the ages of the two volcanic layers. The diagram below shows a portion of the Geologic Time Scale.
The absolute ages of the rocks have been determined through radiometric dating where possible.