Relative age vs. Absolute age
Absolute Age
What is a fossil?
Preseved remains or traces of living things.
Body Fossils
Bones and Teeth
Law of Superposition
States oldest layers are on the bottom
Fossils provide clues about what?
Earths past enviroments
Cody has an older brother
Relative Age
Fossils form in this type of rock
Sedimentary rock
Trace Fossils
Show evidence of activity. Footprints
What type of elements are used for absolute dating?
radioactive elements
What do fossils tell us about extinct organisms?
What they looked like and how they lived.
A set of horizontal layers is cut by a fault, and that fault is then overlain by a layer of volcanic ash.
Relative Age
The process of fossil formation is called
Fossilization
Petrified fossils
Minerals replace all or parts of an organism
Which is more accurate? Relative age or absolute age dating?
Absolute age dating
What theory do fossils support?
Theory of Evolution
A fossilized bone found in a cave is tested with carbon-14 dating and determined to be 32,000 years old.
Absolute Age
False
preserved remains
Fossils preserved in ice, amber or tar.
Index fossils help determine what?
The age of rock layers
Why are fossils of sea creatures found in mountain areas?
the land was uplifted over time
Fossils of trilobites are found in one layer, and fossils of dinosaurs are in the layer above it.
Relative Age
Why are hard parts like bones more likely to fossilize
Bones are less likely to decay and more likely to be preserved.
Mold and Cast fossils
impressions in rocks and fill ins
What must happen first in fossil formation?
The organism must be buried quickly.
Fossil evidence suggests organisms have done this over time
changed or evolved