GEOL-1010 Lecture Notes - Lecture 8: Relative Dating, G1 Phase, Lithostratigraphy

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Geol 1010 lecture 8 part 1: geologic time. Geology in the news: new record for the oldest rock on earth. Estimated to be about 4. 02 ga (billion years old) Found in the northwest territories of canada. Why do we care: geologic time helps us determine how old stuff is. Dating methods: there are 2 types, relative dating. Is cheaper and easier to use to add to research projects. Sometimes all you need is relative dating for research: absolute dating. Putting numbers and dates onto things: ex. a t-rex lived 70,000,000 years ago. Is much more expensive and complex to use due to lab data being needed to provide accurate dating. Finding the relative ages of the layers. This in turn finds the relative ages of fossils in the layers. Usually have gaps in the time sequence of the rocks. Unconformities: a gap of rock indicating a missing layer from a specific time in strata.

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