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The dating lab. Who's on first? a relative dating activity

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.

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Marine sedimentary rocks such as The dating lab, shale, and sandstone might contain fossils similar to those depicted in this activity. The sequence must be exactly in the order as written.

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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 nonsense syllables or letters sometimes overlap other cards and The dating lab being used to introduce the students to the concept of sequencing.

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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.

This is called relative dating. By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata.

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When you complete this activity, you will be able to: The fossils within rock layer OXD i. This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional eventsand notable biological events appearance, relative abundance, or extinction of certain life forms.

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For Set Byou may want to color code each organism type i. The letters on the other cards have no significance to the sequencing procedure and should be ignored at this time.

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All of the fossils represented would be found in sedimentary rocks of marine origin. Explore this link for additional information on the topics covered in this lesson: The cards should be duplicated, laminated, and cut into sets and randomly mixed when given to the students.

The first card in the sequence has "Card 1, Set A" in the lower left-hand corner and represents the bottom of the sequence. This also means that fossils found in the lowest levels in a sequence of layered rocks represent the oldest record of life there.

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Relative dating tells scientists if a rock layer is "older" or "younger" than another. Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help Gute dating namen their age.

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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.

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.

Since this card has a common letter with the first card, it must go on top of the "TC" card.