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Byers Age of Eart

Fossils, Geologic Time

Paleontology Study of fossils
Known Age The age of an artifact as determined by a date printed on it or a reference to the artifact in a work of history.
dendrochronology the process of counting tree rings to determine the age of a tree.
master tree ring pattern groups of tree ring patterns that archaeologists catalog for specific global regions.
radiometric dating using radioactive process to determine the age of an item
absolute age the calculated age of an artifact from a specific dating method that is used to determine when the artifact was made.
principle of superposition when artifacts are found in rock or earth that is layered, the deeper layers hold the older artifacts
relative age age of something compared with the ages of other things
strata distinct layers
permineralized/petrified fossils in which teh spaces inside are filled with minerals from groundwater.
carbonization thin film of carbon residue preserved as a fossil
carbonization Common for most plant fossils.
cast type of fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock
index fossils remains of species that existed on Earth for a relatively short period of time, were abundant, and were widespread geographically
Eon formed by two or more geological eras form , which is the largest division of geologic time, lasting many hundreds of millions of years.
era comprised of two or more geological periods , which is hundreds of millions of years in duration.
period The basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years.
Epoch a division of a geologic period; it is the Smallest division of geologic time, lasting several million years.
Age A unit of geological time which is distinguished by some feature ,like ice. Shorter than epoch, usually lasting from a few million years to about a hundred million years.
fossil The preserved remains of a once-living organism.
In what era did Homo Sapiens evolve? Cenozoic
In what era are Dinosaurs are dominant? Mesozoic
In what era are Amphibians Dominant? Paleozoic
In what period did Dinosaurs become extinct? Cretaceous
In what era do the following periods belong: Quaternary, Neogene, Paleogene? Cenozoic
In what era did the Appalachians beginto form? Paleozoic
In what period did the Paleozoic Era begin? Cambrian
What types of species appeared in the Cenozoic Era? Humans, larger mammals
What types of species appeared in the Mesozoic Era? Small mammals,birds, dinosaurs,
What types of species appeared in the Paleozoic Era? Early reptiles,amphibians, fish, gymnosperms
What types of species appeared in the Precambrian Era? Worms, jellyfish
Created by: byersd2000