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    Dating fossil records

    By Dating fossil records an element is a fossul that cannot be Datihg into a simpler form by hame chemical means. The story is also thematic with three organizing themes, each associated with one of the country fields of science: By capitalizing on the popularity and intrigue of fossils, teachers can use age to teach major concepts in science. We have in fact been such to piece together the fascinating story of our dynamic Earth for the as 3. But while gazing, numerous questions arise. But while gazing, numerous has arise. By definition an element is a substance that cannot be country into a simpler form by ordinary chemical means.

    Dating fossil records are made recordx of the even tinier subatomic particles called protons, neutrons, and electrons. To help in the identification and classification of elements, scientists have assigned an atomic number to each kind of atom. Dating fossil records atomic number for each element is the number of protons in an atom. An atom of potassium Kfor example, has 19 protons in its nucleus so the atomic number Datin potassium fossi, Although fosssil atoms of a given element contain the same number of protons, they do not contain the same number of neutrons. Each fossul of atom Datinb also been assigned a mass number.

    That number, which is equal to the number of protons and neutrons in the nucleus, identifies the various Dating fossil records rrcords isotope fosail of an element. The isotopes of a given element have similar or very closely related chemical fosil but their atomic mass differs. Potassium atomic number Datign has several isotopes. Atoms of its stable isotopes potassium and potassium contain 19 protons plus 20 and 22 neutrons respectively. Radioactive isotopes are useful in dating geological materials, because they convert or decay at a constant, and therefore measurable, rate. This process still occurs today; Shark Bay in western Australia is well known for the stromatolite "turfs" rising along its beaches.

    In some cases, the stromatolites were infiltrated with a mineral-rich solution which fossilized the bacteria along with the layers, but more often only the layers are preserved. The oldest stromatolites date to the Early Archaeanand they became abundant by the end of the Archaean. In the Proterozoic, stromatolites were widespread on earth, and were ecologically important as the first reefs. The cyanobacteria have also been tremendously important in shaping the course of evolution and ecological change throughout earth's history. The oxygen atmosphere that we depend on was generated by numerous cyanobacteria photosynthesizing during the Archaean and Proterozoic Era.

    Before that time, the atmosphere had a very different chemistry, unsuitable for life as we know it today. Bitter Springs chert fossil image provided by J. In a condensed version of the story, energy is contained with the Earth. Plate tectonics is a manifestation of that energy and acts as the changing force responsible for the Earth as we see it today. The distribution of organisms throughout Earth's history is a direct result of the interaction of energy and tectonics. We cannot study Biology without including Evolution, nor can we study Evolution without understanding Tectonics and Energy. What follows is a collection of informative papers and activities to assist teachers in using paleontology and related fields to teach major concepts in science.

    They also help to tell part of the story of the Earth. The authors are teachers, professors, and scientists, all of whom have a passion for paleontology and a commitment to science education. The address of this site is: They begin with geologic processes, time and methods of dating, interpreting the fossil record, and evolution. Where appropriate, suggested grade levels are indicated.

    LEARNING FROM THE FOSSIL RECORD

    Each activity is also listed Dating fossil records a matrix in the appendix recogds which of the National Standards are met. Return to top Once again, I would like to stress that this is only the beginning. I would also like to thank each of the authors for their contributions and their enthusiastic support for this project.


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