Fossil dating methods relative

That plough disturbed and dug up a few inches of soil.

The arrowhead, which was previously buried in the soil popped to the surface.

Harnessing its energy holds great promise for the world’s energy needs, and it will be heavily called upon as fossil fuels are depleted.

There is a great deal of information and enthusiasm today about the development and increased production of our global energy needs from alternative energy sources.

How did that arrowhead end up underground in the first place?

A Native American left it on the surface hundreds of years ago.

Some paleontologists study the ecology of the past; others work on the evolution of fossil taxa.

Thus, although wood, bones, and shells are the most common fossils, under certain conditions soft tissues, tracks and trails, and even coprolites (fossil feces) may be preserved as fossils.

Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers.

The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.

Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material.

The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.