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Absolute and relative dating in geology

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These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

This chapter is an introduction to rocks and minerals, and the rock cycle.

Basic chemistry is important to all sciences, especially geology!

Exploring this series of exhibits will take you on a journey through the history of the Earth, with stops at particular points in time to examine the fossil record and stratigraphy.

The Geology Wing is organized according to the geologic time scale.

With this in mind geologist have long known that the deeper a sedimentary rock layer is the older it is, but how old?

Most of the current senses also were in the Latin word.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.This means that a quartz sandstone deposited 500 million years ago will look very similar to a quartz sandstone deposited 50 years ago.Making this processes even more difficult is the fact that due to plate tectonics some rock layers have been uplifted into mountains and eroded while others have subsided to form basins and be buried by younger sediments.The most obvious feature of sedimentary rock is its layering.