Fossils Mr. Skirbst Earth Science Topic 24. Fossils The preserved remains or evidence of a living...

Fossils

Mr. SkirbstEarth Science

Topic 24

Fossils

The preserved remains or evidence of a living thing

Types of Fossils1. Petrification

minerals replace organic material

Ex. Petrified wood

Types of Fossils2. Molds

empty space left by plant of animal buried in sediment

3. Casts

3. Castsa filled in mold

Types of FossilsMolds & Casts

Types of Fossils4. Imprints

impression in soft sediment

Types of Fossils5. Preservation

entire specimen preserved (hard and soft parts)

Freezing – trapped in ice

Freezing – trapped in iceAmber – trapped in sap

Freezing – trapped in iceAmber – trapped in sapTar pit – trapped in tar

Freezing – trapped in iceAmber – trapped in sapTar pit – trapped in tarPeat pit – trapped in peat / bog

Types of Fossils6. Trace Fossils

tracks, trails, footprints

Age of Fossils

Age of Fossils1. Relative Age:

- determining age “relative” to others

Age of FossilsLaw of Superposition

in sedimentary rock layers, older rocks are beneath younger rocks

Age of FossilsLaw of Superposition

Age of FossilsIndex Fossils

- layers of rock with index fossils are close in age to other layers with the same kind of fossils

Age of FossilsIndex Fossils

Age of Fossils2. Absolute Age

determining the “actual” age of fossils

Age of FossilsRadioactive Dating

- radioactive elements decay at a constant rate

Age of FossilsRadioactive Dating

- radioactive elements decay at a constant rate

Half-life – time it takes for ½ of element to decay

Fossils Mr. Skirbst Earth Science Topic 24. Fossils The preserved remains or evidence of a living...

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