Fossil dating information chart
Explore this link for additional information on the topics covered in this lesson: The letters on the other cards have no significance to the sequencing procedure and should be ignored at this time. The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence. Please note that none of the letters in this sequence may be reversed and still be correct. This activity illustrates this law because when the cards are placed in the correct order, the vertical stack shows the oldest fossils in a rock layer in the bottom of the stack and the youngest fossils in rock stratum on the top. If the letters "T" and "C" represent fossils in the oldest rock layer, they are the oldest fossils, or the first fossils formed in the past for this sequence of rock layers. This is called relative dating. Starting with the top card, the letters should be in order from youngest to oldest. Once an organism disappears from the sequence it cannot reappear later.
This would also mean that fossils found in the deepest layer of rocks in an area would represent the oldest forms of life in that particular rock formation. Stratigraphic Section for Set B. This also means that fossils found in the lowest levels in a sequence of layered rocks represent the oldest record of life there. The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place. Return to top Interpretation Questions: It is recommended that students complete Procedure Set A and answer the associated Interpretation Questions correctly before proceeding to Set B. Arrange them from oldest to youngest with the oldest layer on the bottom and the youngest on top. The following question may help clarify this point. Since this card has a common letter with the first card, it must go on top of the "TC" card. Each card represents a particular rock layer with a collection of fossils that are found in that particular rock stratum. Return to top To enhance this activity, have students match the fossil sketches to real fossils. Once an organism disappears from the sequence it cannot reappear later. When you complete this activity, you will be able to: It may be useful to share with students after they have completed Set B and answered the Interpretation Questions. Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers. This activity illustrates this law because when the cards are placed in the correct order, the vertical stack shows the oldest fossils in a rock layer in the bottom of the stack and the youngest fossils in rock stratum on the top. This is called relative dating. By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. Sequence the remaining cards by using the same process. Keep in mind that extinction is forever. The fossils within rock layer OXD i. Please note that none of the letters in this sequence may be reversed and still be correct. The letters on the other cards have no significance to the sequencing procedure and should be ignored at this time. The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence. The cards in Set B represent rock layers containing various fossils.
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