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Geological Time Scale

K. Morris

Review of the Geological Time Scale

1 2 3
4 5                
9           10    
      11 12  
      13   14  
16 17                

5.weathered rock particles
7.sediments that show one year
8.trilobites important fossils in this era
9.the period known as the age of the dinosaurs
17.time periods in Earth's history broken into four segments
18.change over time
19.law that states younger rocks are found on top of older rocks
20.evidence of once living things
1.era known as the period of many changes
2.breakdown of a radioactive element
3.method of determining the age of a fossil
4.the first period in the era known as the age of mammals
6.the period when mammals first appear
10.fossils of organisms that lived during a short period of time
11.period when the ice age begins and ends
12.era known as the dawn of life
13.wide spread flooding and mass extinctions occur
14.mutation that occurs that helps a species to survive
15.subdivisions of time in earth's history
16.era divided into two great periods

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