Names: _____________________________________________________ Date: __________ Pd: ______
Constructing a Geologic Time Scale – Grade Sheet
_____
[2 pt]
Includes Identification – Name, Period
Organization
_____
[1pt]
Proper length - 5 meters of adding machine tape.
_____
[1 pt]
Proper start - vertical line - left edge of the tape - label it 0 label this line “The Present”.
_____
[4 pts]
uses proper scale
 Each millimeter represents one million years.
 MYA = million years ago.
 Each meter is 1 billion years.
_____
[5 pts]
measure and label meter marks at “1 bya”, “2 bya”, “3 bya”, “4bya” “5 bya”
_____
[4 pts]
HORIZONTAL LINES – Color – Labels – at proper measurements
 GREEN horizontal line
0 to 65 mm
Cenozoic Era.
 BLUE horizontal line
65 mm to 225 mm Mesozoic Era.
 YELLOW horizontal line 225 mm to 600 mm Paleozoic Era.
 RED marker horizontal line
600 to 4600 mm
Precambrian Era.
_____ [10 pts]
VERTICLE LINES with time PERIODS (11) labeled – at proper measurements
 Quaternary
2- 0 mya
[0-2 mm]
 Tertiary
65- 2 mya
[2mm – 6.5 cm]
 Cretaceous
144-65 mya
[6.5 – 14.4 cm]
 Jurassic
208- 144 mya
[14.4 – 20.8 cm]
 Triassic
225-208 mya
[20.8 – 22.5 cm]
 Permian
286-225 mya
[22.5 – 28.6 cm]
 Carboniferous
360-286 mya
[28.6 – 36 cm]
 Devonian
408-360 mya
[36 cm – 40.8cm]
 Silurian
438-408 mya
 Ordivician
505-438 mya
 Cambrian
570-505 mya
_____ [18 pts]
PICTURES located at proper measurements on timeline

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

Modern Humans
Early Human
Woolly mammoth
Early horse
Bird
Early angiosperm 8
Late ammonite
0 mya
1 mya
1 mya
50 mya
65 mya
0 mya
100 mya
[Present – on zero line]
[0.1 cm or 1 mm]
[0.1 cm or 1 mm]
[5 cm]
[6.5 cm]
[8 cm]
[10 cm]











Tyrannosaurus Rex
Brontosaurus
Early pine tree
Early reptile
Early ferns
Early Amphibian
Early land plant
Fish
Brachiopod
Trilobite
Algae
130 mya
150 mya
240 mya
260 mya
300 mya
350 mya
400 mya
440 mya
450 mya
500 mya
3000 mya
[13 cm]
[15 cm]
[24 cm]
[26 cm]
[30 cm]
[35 cm]
[40 cm]
[44 cm]
45 cm]
[50.0 cm]
[300 cm – 3 meters]
_____ [15 pts] Events (16) – Labeled and placed correctly
 Last Ice Age Ends
10,000 years
 Man appears in Colorado
200,000 years
 First human ancestors
4.5 million years
 Florrisant Fossil Beds form
35 million years
 Modern Rockies Formed
50-72 million years
 Shallow seas cover Colorado
85 million years
 Ancestral Rocky Mountains Eroded 225 million years
 Ancestral Rocky Mountains Form
300 -248 million years
 Shallow seas cover Colorado
510 - 300 million years
 Oxygen reaches 20% (present levels) 380 million years
 Pikes Peak Granite intrudes
1,000 million (1 billion) years
 Rifting/faulting/erosion in Colorado 1,450 – 600 million years
 Oxygen begins to build up in atmosphere 2,500 million (2.5 billion) years
 Oldest Earth Rocks
3,800 million (3.8 billion) years
 Earth layers now distinct
4,400 million (4.4 billion) years
 Origin of the Earth
4,600 million (4.6 billion) years
_____
[up to +5 pts] Extra credit mark and label Epochs of the Tertiary Period.
 Paleocene
65-56 mya
 Eocene
56-34 mya
 Oligocene
34-23 mya
 Miocene
23-5 mya
 Pliocene
5-2 mya
_____ TOTAL POINTS EARNED
60