Geology GEOL-G 107 Chapter Notes - Chapter ch2 -3 : Plate Tectonics, Radiometric Dating, Mesozoic
Document Summary
We can estimate time of events by looking at rocks. Using radiometric dating, geologists were able to determine the. Geologic time is no different then normal time, it still uses seconds, years, decades, and millennia. However, geologists see the definition of old differently. To us twenty years could be old but to geologists something millions of years old is actually old. Geologic time is to geology what periodic table of elements is to chemistry. Plate tectonics is to geology what the theory of evolution is to biology. Radiometric dating approximate ages when types of earth material formed and when our solar system formed. During the cambrian time period geologists have evidence of jellyfish like creatures, this was the first sign of complex life on earth. Next is the precambrian era where multi-celled organisms evolved. We see fish, trees, reptiles, amphibians, mammals, birds, and much more evolving in this time period. At the beginning of the triassic period dinosaurs appeared.
