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NC Science 8.2 Earth History
Terms in this set (30)
a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself
a fossilized impression made in the substrate, a negative image of the organism
a fossil formed when a mold is filled in with some sort of mineral which leaves the original form
a fossil formed when minerals replace all or part of an organism
a fossil of plant leaves and some soft body parts of fish, reptiles, and marine invertebrates that decompose leaving behind only the carbon--this carbon creates an impression in the rock outlining the fossil, sometimes with great detail.
rotting or breaking into smaller pieces
geological time scale
a time scale established by geologists that reflects a consistent sequence of historical periods, grouped into four eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic.
having many different types of species
event during which many species become extinct during a relatively short period of time
a scientist who studies fossils
an era that began 4.6 billion years ago, when life first appeared: cyanobacteria, invertebrates/atmosphere began to form
the part of geologic time 542-251 million years ago ; invertebrates, fishes, amphibians, reptiles, ferns, and cone-bearing trees were dominant
"the Age of Reptiles," which occurred from 251-65 million years ago; dinosaurs, mammals, and flowering plants evolved; Pangaea broke up
era that began about 65 million years ago, known as the "Age of Mammals"
method of determining the age of a fossil by comparing its placement with that of fossils in other rock layers
a technique used to determine the actual age of a fossil
a method of determining the age of an fossil or rock by measuring the amount of a specific radioactive isotope it contains
a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
a sample of layered ice that is used to describe climates of the past
a type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
where magma cut through other rock layers underground
a break in a body of rock along which one block slides relative to another
a large section of the lithosphere that is moves because of convection
Law of Superpostion
In undisturbed rock layers, the oldest rocks are on the bottom
the amount of time it takes for half of a radioactive sample to decay.
Fossil that was widespread for a short period of time. A great tool for relative dating.
Change of Earth's features over a long period of time.
Change of Earth's life forms over a long period of time.
Earth's history recorded in rock strata
A messed up or missing section of the rock record.
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