Relative dating activity, relative Dating Diagram
The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer. The African Continent Search form. An earlier current-formed ripple set at bottom of slide was later modified by a second ripple train migrating at right angles to the first.
The nonsense syllables or letters sometimes overlap other cards and are being used to introduce the students to the concept of sequencing. The sequence must be exactly in the order as written.
The following is a list of fossils in the John Hanley Fossil Teaching Set that may be useful in this activity. Marine sedimentary rocks such as limestone, shale, and sandstone might contain fossils similar to those depicted in this activity. Return to top To enhance this activity, have students match the fossil sketches to real fossils. This also means that fossils found in the lowest levels in a sequence of layered rocks represent the oldest record of life there.
Crests of the first set are preserved in the troughs of the second set, hence, the ladderback appearance. Sequence the remaining cards by using the same process.
Locally, physical characteristics of rocks can be compared and correlated. It may be useful to share with students after they have completed Set B and answered the Interpretation Questions.
Relative Dating Diagram Answer Key
By correlating fossils from various parts of the world, start a conversation online dating scientists are able to give relative ages to particular strata. Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age.
Relative Dating Diagram
Stratigraphic Section for Set B. Most of this work was done in the s and s. 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. The cards in Set B represent rock layers containing various fossils.
Use this information to sequence the cards in a vertical stack of fossils in rock strata. Record all of your work in a word processing document. 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. Specific rock formations are indicative of a particular type of environment existing when the rock was being formed. It is recommended that students complete Procedure Set A and answer the associated Interpretation Questions correctly before proceeding to Set B.
Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers. This is called relative dating.
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