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At hand are two types of age determinations. Geologists clothe in the late 18th as well as early 19th century calculated rock layers and the fossils in them in the direction of determine relative age. William Smith was one of the most important scientists from this time who helped to develop data of the succession of different fossils by studying their distribution through the sequence of sedimentary rocks in southern England.
That activity on determining period of rocks and fossils is intended for 8th or 9th grade students. It is estimated headed for require four hours of class time, including more or less one hour total of occasional instruction and account from the teacher plus two hours of association team and individual activities by the students, benefit one hour of examination among students within the working groups.
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Although the recognition of fossils goes back hundreds of years, the systematic cataloguing and assignment of relative ages to different organisms from the distant past — paleontology — only dates back to the earliest part of the 19th century. The oldest undisputed fossils are from rocks dated around 3.