Geological Timeline Activity Page 2
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1
2Table 1 Major Events in Geological Time
Time
Scale
Major Event
Today
0 cm
The Present
~100,000 ya
0.1 mm
Homo Sapiens (Modern Form of Human Species)
~ 22 mya
2.2 cm
Grasses
~ 33 mya
3.3 cm
First Apes
~50 mya
5 cm
Eohippus (First Known Horse)
65 mya
6.5 cm
CENOZOIC ERA
~ 65 mya
6.5 cm
Dinosaurs Extinction
~140 mya
14 cm
First Flowering Plants
~200 mya
20 cm
Earthworms
~220 mya
22 cm
First Mammals
~240 mya
24 cm
Start of the age of the dinosaurs
248
24.8 cm
MESOZOIC ERA
~330 mya
33 cm
Winged Insects
~380 mya
38 cm
First Insects
~390 mya
39 cm
First Sharks
~395 mya
39.5 cm
Amphibians
~400 mya
40 cm
Ferns
~440 mya
44 cm
First Land Plants
~440 mya
44 cm
First Jawed Fish
540 MYA
54 cm
PALEOZOIC ERA
~550 mya
55 cm
Jellyfish
~1.8 bya
1 m 8 cm
First Eukaryotes
~2.4 bya
2 m 40 cm
Significant rise in oxygen, to ~2% level
~3.5 bya
3 m 50 cm
Prokaryotes (bacteria)
~4.6 bya
4 m 60 cm
Formation of Earth and Moon
4.6 bya
4 m 60 cm
PRECAMBRIAN TIME
Analysis
1. For how long has there been life on Earth? _____________________________________________
2. For what percentage of time has life existed on Earth (round to the nearest whole number).
_______________________________________________________________________________
3. For about how many years of geological time have humans existed on Earth?
_______________________________________________________________________________
4. For about how many years of geological time have the dinosaurs existed on Earth?
_______________________________________________________________________________
5. Did dinosaurs exist at the same time as humans? _______________________________________
6. How do scientists determine when an era begins and when it ends?
_______________________________________________________________________________
_______________________________________________________________________________
7. What is the purpose of making a geological timeline?
_______________________________________________________________________________
_______________________________________________________________________________
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