Activity 7: Relative Dating | EARTH The African Continent Activity 7: Relative Dating | EARTH The African Continent

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The letters on the other cards have no significance to the sequencing procedure and should be ignored at this time. 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. The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer.

Relative-Age Dating of Rocks

Access this lesson's reading by clicking on the Library Resources in Canvas, then clicking on the "E-Reserves" link.

When you finish, you should have a vertical stack of cards with the top card representing the youngest fossils of this rock sequence and the "TC" card at the bottom of the stack representing the oldest fossils.

Electronic course reserves, or "e-Reserves," are articles and book chapters that are available online through the University Libraries. Relative dating tells scientists if a rock layer is "older" or "younger" than another.

INTRODUCTION

This will enable your teacher to quickly check whether you have the correct sequence. When you finish, you should have a vertical stack of cards with the top card representing the youngest fossils of this rock sequence and the "TC" card at the bottom of the stack representing the oldest fossils.

Carefully examine the second set of cards which have sketches of fossils on them.

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This is called relative dating. The following is a list of fossils in the John Hanley Fossil Teaching Set that may be useful in this activity.

It may be useful to share with students after they have completed Set B and answered the Interpretation Questions. 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.

Section 2: Relative-Age Dating of Rocks

Find a rock layer that has at least one of the fossils you found in the oldest rock layer. To determine which rock units were older and which ones were younger in a relative sensegeologists devised a number of laws, or principles, to help figure out Relative dating online activity sequence of geologic events in a particular locality.

The fossils within rock layer OXD i. While you are there, feel free to post your own responses if you, too, are able to help out a classmate! Figure 2-A gives some Worst pick up lines online dating information on the individual fossils.

The brachiopod, crinoid, eurypterid, foraminifera, gastropod, horn coral, pelecypod, and trilobite could probably not be used as index fossils since they overlap more than one stratum.

The fossils represented by the letters on this card are "younger" than the "T" or "C" fossils on the "TC" card which represents fossils in the oldest rock layer.

The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer.

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All of the fossils represented would be found in sedimentary rocks of marine origin. Technically, however, given only this set of strata, one cannot say that the shark's tooth and ichthyosaur could be used as index fossils because we do not know if they continue in younger rock layers above this set of strata.

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.

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It is not uncommon to have students reverse the M and D for example and begin the sequence with DM because that is the way they are printed on the card. 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.

How do you know that "X" is older than "M"? In reading earth history, these layers would be "read" from bottom to top or oldest to most recent. Spread the cards with the nonsense syllables on the table and determine the correct sequence of the eight cards by comparing letters that are common to individual cards and, therefore, overlap.

Return to top Interpretation Questions: Specific rock formations are indicative of a particular type of environment existing when the rock was being formed.

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If you have any questions about the lesson materials or assignments, post them to our online discussion forum not e-mail. Resources Before you begin this activity, read the book chapter listed below, which is available online through Library Reserves.

Relative dating tells scientists if a rock layer is "older" or "younger" than another. On a larger scale, even between continents, fossil evidence can help in correlating rock layers. Find a rock layer that has at least one of the fossils you found in the oldest rock layer.

The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world.