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Rock and Fossil Record


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4.an index fossil
5.object created when a mold is filled with sediments that become rock
8.priniciple that states that the geological processes that are acting on the Earth today are the same as those that acted upon the Earth in the past
11.type of trace fossil
13.insects are often preserved in this
14.atoms of the same element with different masses
17.occurs when an organism's tissue is completely replaced by minerals
18.four major parts of the geologic time scale
19.era where reptiles dominated
22.ideal sequence of rock layers that contain all known fossils and rock formations
24."old life"
27.trace fossil of shelters made by animals
1.the time it takes for one half of a radioactive sample to decay
2.process where organisms do not decay because the bacteria that feeds on the dead organism can't live without water
3.a process in which mineral fill in the pore spaces of an organism's tissue
6.type of fossil where the animal's acitivity is preserved
7.missing part or gap in the geologic column
9.most of the fossils of saber-toothed cats are found here
10.fossils of organisms that lived during a relatively short, well defined time period
12.principle that states that the younger rock layers lie above older rock layers in undisturbed sequences
13.dating technique that establishes the age of an object
15.preserved feces
16.era where mammals dominated
20.the process where an unstable isotope changes into a stable isotope
21.dating technique that uses the principle of superposition to determine if an object or event is older or younger than another object or event
23.a cavity in ground where a plant or animal was buried
25.unconfomity that exists between horizontal rock layers and rock layers that are tilted or folded
26.naturally preserved evidence of life

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