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Fossil Record

Fossil Record and Evolution

Uniformitarianism The principle that geologic processes that occurred in the past can be explained by current geologic processes.
Law of Superposition The principle that sedimentary rock layers are older than the rock layers that are above it and younger than the rock layers below it.
Ontogeny The development of a species through its life cycle.
Phylogeny The relationship of a species through a common ancestor.
James Hutton Scientist who came up with the principle of uniformitarianism.
Fossil Any preserved evidence of a past geologic age.
Index Fossil A fossil used to determine the age of a rock layer.
Cladogram A diagram that shows relationships between species.
Common Ancestor An ancestor that is shared by two or more organisms.
Relative Age The age of an object in relation to the ages of other objects.
Absolute Age The numeric age of an object or event, often found by using radiometric dating.
Embryos that have a closer related form means.... they share a more recent common ancestor.
In closer related forms, the earlier stages of embryos are... more similar than later stages.
Fossils can provide evidence of.... past climates, past ecosystems, past behaviors, mountain building, and past biodiversity.
The shape of fossil leaves can tell us of.... past climate.
Percentage of species that have gone extinct. Over 90 %
Is an intrusion of rock that cuts through rock layers younger or older than the rock it cuts through? Younger.
Finding reef fossils in the desert provide what type of evidence? The area was once covered by an ocean.
What can pollen fossils tell us about the past? The type of plants that lived there.
Extinction When a species dies off from the earth.
Created by: cook2sm