Fossils

when a part of an organism such as a skeleton is preserved and remains in its original form

• Original fossils

• Fossil

• Indirect fossil

• Index fossils

date lines that determine the age of a tree

• ice cores

• 
  peat

• absolute dating

• 
  tree rings

An extinct mollusc that is used as an index fossil

• Strata

• 
  Amalekites

• Ammonites

• 
  Trilobites

Fossil that is an imprint of the outside of an organism's body

• mold

• 
  bacteria

• fossil

• 
  cast

Fossils that are assumed to represent a certain period in earth's past. eg ammonites and trilobites

• Index fossils

• 
  Original fossils

• Fossil record

• Fossil

- Original
- Replacement
- Carbon film
- Indirect fossils

• Types of fossils

• 
  Index fossils

• replacement fossil

• 
  Absolute dating

the scientific study of fossils

• Geology

• 
  Paleontology

• Biogeography

• Stratigraphy

The preserved remains or traces of an organism that lived in the past

• Fossil

• 
  Mold

• Cast

• Trilobites

Atoms of the same element that have different numbers of neutrons

• Isomers

• Isotopes

• Ions

• Stratigraphy

layers of sedimentary rock

• Prisma

• 
  Sediment

• 
  Strata

• Peat