PPT-Relative Dating

Earth Science Grade 8 The Principle of Superposition the rocks on the bottom of the column are older than the rocks at the top   The Principle of Original Horizontality most sedimentary layers of rock are deposited in a . These artifacts suggest a people who hunt and gather for a living who own few material possessions suggesting mobility and who have mastered the use of fire and tool making Level II middle pictures of sherds broken pieces of decorated pottery a mort Geologic Time Display. Description of Relative Dating. Refers . to the science of defining the relative sequence of past events, without . knowing . the relative . period. . The . order in which a series of events occurred, and when they have not occurred can be . Relative Dating. Relative Age. : the age of something compared to something else.. Absolute Age. : the actual age of a rock or an event . The Principal of Superposition. In undisturbed sedimentary rock layers (strata), the oldest rock is at the bottom. . Biology. 2015. Dating Techniques. DATING FOSSILS. Absolute dates. : actual age of the specimen in years. Relative dates. : determine whether one sample is older or younger than another. Stratigraphy – RELATIVE DATING. Lucy is a fossil of . Australopithecus . afarensis. , . an. . early . form of . human, . that was discovered in 1974 in Ethiopia.. Lucy is estimated . to have lived about 3.2 million years . ago.. What does Lucy tell us about the evolution of humans?. Fossils found in SEDIMENTARY ROCKS. The lower the sediment layer is, the older the fossils of the layer will be.- Law of Superposition. As time elapses, more and more sediment layers form to create the layers of sedimentary rocks.. Relative Age Dating of Rocks. Put these people in order from youngest to oldest.. A. B. C. D. Relative age Dating of Rocks. Can you tell the exact ages of these people?. Dating. Relative age dating- . Dating. Methods. archaeological . dating methods. relative . dating . (aka “older/younger” dating). chronometric dating. . (. aka “absolute” dating). Relative and Chronometric Dating. Fossils. Fossils provide a window into the past as they provide evidence about the changes that have occurred to the Earth over the 4.5 billion years of existence.. A . fossil . is the preserved evidence in rocs or soils of organisms that once existed on Earth.. Fossils. Fossils provide a window into the past as they provide evidence about the changes that have occurred to the Earth over the 4.5 billion years of existence.. A . fossil . is the preserved evidence in rocs or soils of organisms that once existed on Earth.. Relative Dating. To . determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This is called the Rule of Superposition.. Mrs. Wright. 8. th. Grade Science. Bath County Middle School. Superposition. —Oldest Rocks on the Bottom. According to the . principle of superposition. ,. . in undisturbed layers of rock, the oldest rocks are on the bottom and the rocks become progressively younger toward the top.. Estimating age in the archaeological record is the primary focus of archaeological sciences. Being able to establish a timescale is what sets archaeologists apart from other disciplines. . However. , relative dating techniques are still fundamental to the discipline.. Folds, Faults and Deformities…. OH MY!!. Uniformitarianism. Geologic processes that occurred in the past can be explained by current geologic processes. Erosion and weathering that happens today must have been the same millions of years ago.