Numbers
Time
Era
Illinois Time Machine
Fossils
100
What percentage of geologic time does the Precambrian Eon take up?
What is 90%
100
What is the longest unit of geologic time
What is eon
100
Earth's interior cooled to modern levels
What is Paleozoic
100
Which Era? Illinois is a muddy delta swamp! Trees are 100 ft tall and there are lots of amphibians and reptiles including giant dragonflies.
What is Paleozoic
100
Name a fact about crinoids
What is ANSWERS WILL VARY
200
What is the approximate age of Earth?
What is 4.6 bya
200
What is a subdivision of a period in geologic time?
What is epoch
200
Includes the Triassic, Jurassic, and Cretaceous Periods
What is Mesozoic
200
Which era? Its an ice age with glaciers covering Illinois and mammoths, saber-tooth tigers, and ground sloths are found on the land.
What is Cenozoic
200
Name a fact about brachiopods
What is ANSWERS WILL VARY
300
This era occurred from 570 mya to 245 mya
What is Paleozoic
300
What is a subdivision of an era called in geologic time?
What is a period
300
Age of Invertebrates
What is Paleozoic
300
Which era? Illinois is covered by an ancient ocean with shells, corals, primitive fish, and trilobites.
What is Paleozoic
300
Name a fact about horn coral
What is ANSWERS WILL VARY
400
This era occurred from 245 mya to 65 mya
What is Mesozoic
400
What is the smallest unit of geologic time?
What is an epoch
400
Earth has a cooler climate and glaciers return
What is Cenozoic
400
Which era? Illinois is warm, dry, and full of hills and valleys with dinosaurs roaming the land.
What is Mesozoic
400
The trees and plants from Illinois' delta swap were buried and over time formed ______________
What is coal
500
When did the Cenozoic Era begin
What is 65 mya
500
Write in order from longest to shortest, the four units of geologic time
What is eon, era, period, epoch
500
Age of reptiles
What is Mesozoic
500
Which era? Illinois is a shallow tropical ocean with seashells, brachiopods, crinoids, and trilobites
What is Paleozoic
500
Why hasn't a dinosaur fossil been found in Illinois if they once lived here?
What is erosion washed away any evidence
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