Numerical dating excerpts from an online dating service

Numerical dating

For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.Second, it is possible to determine the numerical age for fossils or earth materials.Numerical ages estimate the date of a geological event and can sometimes reveal quite precisely when a fossil species existed in time.A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.However, by itself a fossil has little meaning unless it is placed within some context.

In the Grand Canyon, the layers of strata are nearly horizontal.The principle states that any geologic features that cut across strata must have formed after the rocks they cut through (Figures 2 and 3).According to the principle of original horizontality, these strata must have been deposited horizontally and then titled vertically after they were deposited.Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

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Layers that cut across other layers are younger than the layers they cut through (principle of cross-cutting relationships).

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