Using a scale of 1 millimeter on your line = 2.5 million years mark off the events and times from the table below on your line.

Paper, Order, or Assignment Requirements

 

 

unit_6_lab_procedure

Requirement of Lab #6

 

How long are geologic periods relative to the age of the Earth?

This lab consists of three parts. Part one is a modelling assignment, in parts two and three you will apply the geologic dating principles for relative and absolute dating.
Link to procedure sheet
Complete the procedure.

 

Earth Science 11

Unit 6 Lab procedure

 

Purpose:

  1. to demonstrate the length of geologic time
  2. to apply the laws of relative dating
  3. to apply the laws of absolute dating

 

Procedure:

Part A

  • Carefully tape 8 pieces of regular paper together.
  • Label one end of your line “Formation of the Earth” and label the other end “Today”.
  • At “Formation of the Earth” mark the time as 5000 mya (million years ago).
  • Using a scale of 1 millimeter on your line = 2.5 million years mark off the events and times from the table below on your line.

 

Alternate

  • Create one slide in powepoint. Draw a horizontal straight line.
  • In the “Edit” menu, copy the first slide. Use the paste menu to create 9 more slides so that you have a total of 10 slides.
  • Draw a dot at the leftmost edge of the first slide and label it “Formation of the earth.”
  • Draw a dot at the rightmost edge of the last slide and label it “Today”
  • Use dots or vertical arrows to indicate the following events along the timeline.

 

Event MYA Event MYA
First rocks 4200 Triassic
Oceans form 4000 Dinosaurs
Stromatolites 3000 Pangea breaks up
Cambrian 540 Jurassic 206
Ordovician 490 Rocky Mtn. Orogeny 180
Taconic Orogeny 475 First birds 150
Silurian 443 Cretaceous 144
First fish 430 First mammals 100
Devonian 417 Comet Impact 65
Mississippian 354 Tertiary 65
Early reptiles 340 Early humans 2.0
Pennsylvanian 323 Quarternary Ice Ages 1.5
Permian 290 Today 0
Pangea formed 275

 

5) Add diagrams to your timeline that are appropriate to each event.

 

 

Part C

  • Absolute Dating Data:

 

The following samples were collected an percentage of parents isotopes remaining in them are listed. Use the absolute dating curve from the page on Absolute Dating and the table on the same page to determine the age of each sample.

 

Meteorite from Antarctica ç 45 % Uranium – 238 remaining

 

Sample of gneiss from Canadian Shield ç 12 % Potassium – 40 remaining

 

Burned remains of wood from fire pit ç 30 % Carbon – 14 remaining

 

  • Use the graphs and the half life data table from the page on Absolute Dating to find the age of each sample.
  • Record the age of each sample.

 

Record all information and submit it to your instructor

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