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8.13 Mrs Jensen
Geologic Time
13
Science
8th Grade
10/25/2011

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Term
geologic time scale
Definition
record of events in Earth's history based on major evolutionary changes and geological events
Term
era
Definition
major subdivision of the geologic time scale based on differences in life-forms
Term
period
Definition
next-smaller division of the geologic time scale after era
Term
epoch
Definition
division of geologic time smaller than a period
Term
trilobite
Definition
an organism that lived hundreds of millions of years ago and is considered an index fossil of the Paleozoic era
Term
Precambrian time
Definition
longest geologic time unit in Earth's history
Term
cyanobacteria
Definition
one of the earliest life-forms on Earth
Term
Paleozoic era
Definition
geologic era marked by the first appearance of life-forms with hard parts
Term
amphibians
Definition
animals that live on land and breathe air but return to water to reproduce
Term
reptiles
Definition
egg-laying, scaly skinned animals that do not need to return to water to reproduce and probably evolved from the same ancestor as amphibians
Term
Mesozoic era
Definition
geologic era in which Pangeae broke up, the present-day continents were formed, and whose dominant land life-forms were reptiles and gymnosperms
Term
gastroliths
Definition
stones swallowed by dinosaurs and by modern birds to help with digestion
Term
Cenozoic era
Definition
geologic era in which we live
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