The First Presentation of the Time Line of Life

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The Time Line materials:

  • Colored chart, blank chart, loose pictures, labels.
  • Elastic strip which is the circumference of the Clock of Eras.
  • Clock of Eras chart
  • The Body functions of the Vertebrates
  • If possible, pictures of the environments of each period for animals and plants.



  1. Repeat the three period lesson for the clock of Eras., recalling the meaning of the names of the last four periods.
  2. Using an elastic strip which is a linear Clock of Eras, pick up the linear Clock.
  3. " This is the clock as a line. Notice the colors are the same as the clock - but if I stretch out the last 4 colors, it will be the same as the top of the big time line."
  4. Notice that the colors along the top row are the same, and in the same order as the colors on the strip and the Clock.
  5. Recall the names of the Eras on the top row.
  6. Scientists have studied the history of the earth for thousands of years.
  7. They have found the remnants of life on earth through crude discovery and now, with sophisticated instruments.
  8. They have developed a time line of the life which has left its mark on the earth.
  9. This is a chart of many of the life forms which have been found.
  10. The name of each periods reflect the history of these scientists' discoveries.
  11. Read the name of each age mentioned in the second row, recalling the meaning of the name, i.e. amphibians and locating these animals in the Classification or Body Function cards.
  12. Observe that the order follows the same direction on the time line and the classification charts.
  13. Observe that the order follows the same direction on the time line and the Classification or Body Function Cards.
  14. The child should be able to give simple descriptions for the characteristics of each vertebrate class.
  15. NOTE: birds are on the time line, but there is no time where they dominated the earth.
  16. Notice the great icicles. Theses are glacial periods.
  17. During these times, a great part of the land was covered with ice.
  18. Before and after these periods, the earth was very warm.
  19. The triangular shape of the icicles show that the coldness increased gradually.
  20. At the vertex of the icicle, it was the coldest time, then it decreased.
  21. Notice the red lines and their paths.
  22. Some of them start and the beginning, rise and fall.
  23. Some of them are continuous until the end.
  24. These lines indicate the appearance of animals on earth.
  25. The highest point is the time of their height of population and dominance.
  26. Their end points is when they became extinct for whatever reason.
  27. It is possible to study earth history through the rise and fall of mountains.
  28. Mountains have not always been here. They usually developed slowly and then gradually eroded and became flattened over millions of years.
  29. The Rockies, Alps, Himalayas and others are among the last to appear on earth.
  30. They are being flattened so slowly that we wouldn't notice the change in our lifetimes.
  31. Give three period lesson to check comprehension.

Control Of Error

Points Of Interest


  • A general presentation of the time line, relating it to the previous material: The Clock of Eras.


The child can label the eras, the mountains and ice ages.

The child can write their names or draw (especially later when animals are presented).