Fossils - Evidence of Past Life

Fossils: Evidence of Past Life
Molds and Casts: Molds and casts are made by sediment dissolved with underground water. It doesn't provide any information about its internal structure
Petrified Fossils: Fossils often form when an organism remains become petrified. In this process mineral rich water soaks into the small cavities and pores of the original organism. The minerals precipitate from the water and fill the spaces.
Fossil Succession: fossil organisms that succeed one another. Each layer of a fossil can be examined.
Fossils and Correlation: Geologists today use index fossils and groups pf fossils to correlate rock layers.
Fossils and Past Environments: Fossils can also be used to reconstruct ancient environments. Fossils provide clues to the characteristics of those environments. Fossils can also help geologist build an even more detailed picture of the past environment. Fossils can indicate the former temperature of the water
Theory of Evolution: Life forms have changed over time, evolved, from simpler to more complex forms
Trace Fossils: Trace fossils are indirect evidence of prehistoric life.
Carbon Films: Fossils called carbon films can preserve delicate details of leaves and animals parts. The formation of a carbon film begins when an organism is buried under fine sediment.