Chapter Three Notes:
- Darwin claimed that from geological formations resulted the gradual change that spread over vasts
amount of time on earth.
- Lord Kelvin had proposed that to determine the age of the earth/world was not through lookin at rock
formations but at their temperatures. (Determining how long have they been cooling down for)
- Physicists finally concluded that the way to calculate the age of the earth was thru radioactive decays.
- The Earth is 4.568 billion years old
Lagerstatte (plural Lagerstatten): A site with an abundant supply of unusually well-preserved fossils from
the same period of time, often including soft tissues.
Burgess Shale: A Lagerstatten in Canada that preserved fossile from the Cambrian period.
- Fossils show everything about an organism, from what it eats to what creatures eat it to where it was
and how it died.
- In-living birds, some of the color of their plumages are produced by pigment-loaded structures called
- The shape of an animal's ear bones determines which frequencies it is most sensitive to.
Biomarkers: Molecular evidence of life in the fossil record. Can include Fragments of DNA, molecules
such as lipids and isotopic ratios.
- Biomarkers are so distinctive that you can identify the group of species that produced them.
-Okenone is a carotenoid pigment found exclusively in purple sul