History of Earth: using Fossils and Rock Layers to tell the story
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Exploration of Earth History What evidence can we find in rocks?
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Students are working to understand how rocks tell the history or Earth. Presentation includes fossils and rock layers.
Transcript of History of Earth: using Fossils and Rock Layers to tell the story
Exploration of Earth History
What evidence can we find in rocks?
Rocks tell the story of Earth’s History
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Red Rock Canyon CODevil’s Tower
Wyoming
Painted Desert Arizona
Rocks tell the story
Link for image
Rocks can provide evidence
Age of the Earth Type of organisms Evolution of Species
Environmental Changes
Original RemainsFossils that are the actual bodies or body parts
Who is ICE MAN?
Who needs Ice if you have Maverick?
Ice Man from Himalayans
5,300-year-old corpse turned up on the mountain border between Austria and Italy in 1991
Ice Man Trapped
Ice Man Close Up
Inferences from NatGeo
Trapped in Amber
Tar Pits
Fossils in Sedimentary Rocks
Image Link
Mold: hollow area left by the living thing
Cast: solid mineral deposit that filled the mold, leaving a copy
Image Link
Trace Fossils
Trace: tracks, burrows, nests
Image Link
Image Link
Petrification tissue replaced by minerals
Carbon Films
Ice Core Samples
Relative Dating How old something is in comparison
to something else
Index Fossils
Only around
for short periods of time
Ammonite Found in sedimentary rock
layersabout 400 million years ago
Trilobite Fossils show:BiodiversityHow species have changed over timeCorrelation between rock layers from
around the worldRelative ages to particular strataEvidence for the geological time scale
Law of SuperpositionLaw that states the older layers were laid down
first, then younger materials was put down on top of it
Younger Igneous Rock can cut through rock layers
Closer Look at Rock Layers
Do you see evidence of Erosion
Earthquake A river
Principles of Crosscutting
The geologic feature which cuts another is
the younger of the two features
What kind of rocks are these fossils in?
Which layer is oldest?
Which layer is youngest?
How do you know?
Intrusions vs Extrusions
Intrusion: when magma cools within the earth
Always younger than the rock around it
Extrusion: when lava cools outside the earth
Image A Image B
Image C
Is this an Igneous Intrusion?
What evidence do we see in these
Road Cuts?
Image A Image B Image C Image AImage AImage A
Image D Image E Image F
Did the fold happen before the red rock was deposited?
What could have caused F? When did it happen?
Did the eruption happen before or after layer H?
What story does these rocks tell?Where is the river?
Between which two layers was a fast moving river?
Absolute Dating
The actual age of the event
Half Life: the length of time it takes for half of the atoms in a sample of a radioactive element to
change from an unstable form into another form
