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Vertebrate History in Rocks (What are Fossils? (A Fossil (Hardened remains…
Vertebrate History in Rocks
What are Fossils?
A Fossil
Hardened remains or other evidence of a living thing that existed long ago
They decayed fast
Rock
Bones
Shells
Skeleton
Fossils are found most frequently in Sedimentary rocks
They are made of
Mud
Sand
Clay
Interpretation of Fossils
A fossils Age
How to estimate a fossils age
Fossils in higher layers of rock are often younger than fossils in lower layer
They also have radioactive chemicals
They decay faster
Using Fossils
Paleontologists have used fossils to fossils to determine a likely pattern of how vertebrates change over time
Fishes
530 million years ago
Amphibians
380 millions years ago
Birds
The latest
By studying fossils, paleontologists can infer how animals changed over time