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In the second part of the activity, students progress to dating rock layers by sequencing fossils found in the different strata.


Extinction of species is common; most of the species that have lived on the earth no longer exist. For example, students should discuss which fossils are making their first appearance in a particular segment and which fossils have disappeared.

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In order to align this activity more closely to this practice, teachers should require students to explain and justify each step of their timeline. Relative dating tells scientists if a rock layer is "older" or "younger" than another. Once students begin to grasp "relative" dating, they can extend their knowledge of geologic time by exploring radiometric dating and developing a timeline of Earth's history. Arrange them from uppest relative dating activity to youngest with the oldest layer on the bottom and the youngest on top.

Are you sure you want to delete this list? Starting with the top card, the letters should be in order from youngest to oldest.


The major difficulty that students may encounter is the concept that extinction is forever. Keep in mind that extinction is forever. Three-lobed body; burrowing, crawling, and swimming forms; extinct. For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed.

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.

Return to top Procedure Set B: This resource appears to be designed to build towards this crosscutting concept, though the resource developer has not explicitly stated so. Analyses of rock strata and the fossil record provide only relative dates, not an absolute scale.

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The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages. Graphs, charts, and images can be used to identify patterns in data.

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Discover new books Read everywhere Build your digital reading lists. Primitive armored fish; extinct.

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By using this information from rock formations in various parts of the world and correlating the studies, scientists have been able to establish the geologic time scale. However, "relative" dating or time can be an easy concept for students to learn.

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Using the results of these activities, teachers can then lead students in a discussion of the Law of Superposition and the identification and value of index fossils. Primitive form of chordate; floating form with branched stalks; extinct.

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By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. Locally, physical characteristics of rocks can be compared and correlated. Also remove everything in this list from your library.