Relative dating superposition

This lesson serves to allow for a preliminary integration of current laboratory assays and Earth Science content.

relative dating superposition-44

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nderstanding of the geologic effects of Earthquakes on Earth’s strata, “The Geologic History of New York State” table in the “Earth Science Reference Tables”, electrophoresis, function and structure of the DNA molecule.

Fossils that are in violation of the law of superposition where the older fossil occurs above a younger fossil are said to be stratigraphically disordered.

" virtually all sedimentary systems have stratigraphic disorder at come scale is probably a common feature of the fossil record " Fossils out of Sequences Cutler Palaios June 1990 on The conclusion of some scientists is that the Law of Superposition just doesn't work Shindewolf Comments on Some Stratigraphic Terms American Journal of Science June 1957 " Historical geology relies chiefly on paleontology the study of fossil organisms. The Law of Superposition makes logical sense but in practice it is the nature of the fossils found in the sedimentary layers that determine the relative ages of the rocks.

Standard 5.4 All students will develop problem-solving, decision making, and inquiry skills reflected by formulating usable questions and hypotheses, planning experiments, conducting systematic observations, interpreting and analyzing data, drawing conclusions and communicating results.

The law of superposition is based on the common sense argument that the bottom layer had to laid down first.

One scale records relative time and helps to describe the geologic record.

Relative time places events in a sequence but does not tell us the actual date of occurrence. The relative time scale is based on the sequence of layering of the rocks and the evolution of life.

Next they should determine which creatures’ DNA is most closely related to the known organisms’ DNA by examining the analytical gels.

They should then be asked to use the results from the analytical gels to determine the age of their creatures as they relate to the known organisms’ DNA.

Elicited student responses to the information on the handout should be followed by an explanation.

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