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What do these rocks have in common? What do you see that makes you say so? (Be as specific and as scientific as you can.). Coal. Fossil. Limestone. Coral. Still needs revision. Get some coral and coal for the kids to look at. Horn Coral in with fossils. “Biotic” Rocks.

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Presentation Transcript
slide1
What do these rocks have in common?What do you see that makes you say so?(Be as specific and as scientific as you can.)

Coal

Fossil

Limestone

Coral

biotic rocks

Still needs revision.

  • Get some coral and coal for the kids to look at.
  • Horn Coral in with fossils

“Biotic” Rocks

The Organisms’ Chapter of the Rock Story

fossils
Fossils:
  • Fossils can tell us about the history of life on earth.
  • Fossils can tell us about the climate on earth.
  • Fossils can help us date rock layers.
types of fossils body
Types of Fossils - Body

Lightning

Shell in rock

Frozen

Amber (tree sap)

Peat Bog

Bones in rock

types of fossils trace
Types of Fossils - Trace

Gastroliths (stones to aid digestion)

Coprolite (poo)

Bite/gnaw marks

Tracks

Burrows

types of fossils cast
Types of Fossils - Cast

Pompeii, Italy

Natural vs. Artificial?

slide10
Coal:
  • Plants that live in swampy/marshy habitats die and turn into peat.
  • Peat is compressed over the course of millions of years and turned into coal.
coral
Coral:
  • Coral produces a hard structure that serves as a sort of skeleton. When each generation of corals die their “skeleton” is left behind, building up very slowly year after year.
  • Coral Castle in Miami, FL
limestone
Limestone:
  • Small marine invertebrates (salt water animals without backbones) use a good deal of calcium in their shells.
  • The animal dies and the soft parts rot away but the shells remain and build up layer after layer.
  • The shells are compressed and turned into limestone.
these horn coral fossils are limestone
These Horn Coral Fossils are Limestone

What we think the living organism may have looked like.

fossils1
Fossils:
  • Rock layers can help date fossils and fossils can help date rock layers.
  • Archaeopteryx is a very famous fossil.
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