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Earth's History

Across
Dating that tells the specific age of a fossil
The first period of the Mesozoic Era
Organisms of a the same group that can produce offspring
Fossil remains that include footprints and inform us about how organisms lived
____ time scale
The middle stage of the Phanerozoic Eon - includes the dinosaur age
Preserved remains of living things
Era that comes before the Paleozoic
Dating that uses information to determine if something is younger or older
A species that is in danger of becoming extinct
One of the earliest fossils found of life on earth
Smaller block of time than Era - includes Jurassic
Down
The middle of the Mesozoic period that was the "heyday" of the dinosaurs
The largest block of geologic time
Includes the Paleozoic, Mesozoic and Cenozoic
The first stage of the Phanerozoic Eon - "ancient"
When a species is no longer living on earth
The last stage of the Phanerozoic Eon - goes to the present
Type of fossil that helps identify a specific time period
The center layer of the earth
The outermost layer of the earth
Earth's history traced to 4.5 ____ years ago.