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Learn how scientists determine the ages of rocks and fossils.We'll explore both relative and numerical dating on our quest to understand the process of geological dating.He calculated the modern rate of salt delivery to the oceans, and suggested that the present salinity of ocean water would take at least 100 million years to develop.In the 1860's, English physicist Lord Kelvin disagreed with Charles Lyells proposition that the earth behaves in a uniform, unchanging manner.

It's this resetting process that gives us the ability to date rocks that formed at different times in earth history.Yet, it is the canyon’s rock walls that allow people to develop their greatest perspective on geologic time, because of these rocks’ immense age, their fossil record, and because these rocks formed in environments far different than those found in northern Arizona today.With a rock record that spans more than 1500 m.y., Grand Canyon is truly a panoramic view into the geologic past.Scientists are always spouting information about the ages of rocks and fossils. Well, they figure it out using two different methods: relative dating and numerical dating.Let's find out more about these geological dating methods in order to understand how Paul the Paleontologist can be so sure about the age of his dinosaur fossils.But really, how do scientists figure out how old their dinosaur bones are?

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