A relative age dating activity answers A relative age dating activity answers

A relative age dating activity answers

This is called relative dating. Clams and oysters; many living species NAME: Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.

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Although most attention in today's world focuses on dinosaurs and why they became extinct, the world of paleontology includes many other interesting organisms which tell us about Earth's past history. Return to top Procedure Set B: On a larger scale, even between continents, fossil evidence can help in correlating rock layers.

Multibranched relative of starfish; lives a relative age dating activity answers to the ocean bottom; some living species "sea lilies". Many were large a few rare species were 5 feet in length ; crawling and swimming forms; extinct.

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Jellyfish relative with stony Cnidaria calcareous exoskeleton found in reef environments; extinct NAME: Primitive form of chordate; floating form with branched stalks; extinct.

Squid-like animal with coiled, chambered shell; related to modern-day Nautilus.

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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. This will enable your teacher to quickly check whether you have the correct sequence.


Teaching about Earth's history is a challenge for all teachers. The "Who's On First?

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When you complete this activity, you will be able to: By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata.

This also means that fossils found in the lowest levels in a sequence of layered rocks represent the oldest record of life there. If certain fossils are typically found only in a particular rock unit and are found in many places worldwide, they may be useful as index or guide fossils in determining the age of undated strata. Locally, physical characteristics of rocks can be compared and correlated. For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed.

Find a rock layer that has at least one of the fossils you found in the oldest rock layer.

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Extinction of species is common; most of the species that have lived on the earth no longer exist. Each card represents a particular rock layer with a collection of fossils that are found in that particular rock stratum. 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.


Carnivore; air-breathing aquatic animal; extinct. Relative dating tells scientists if a rock layer is "older" or "younger" than another. Figure 2-A gives some background information on the individual fossils.

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Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age. Three-lobed body; burrowing, crawling, and swimming forms; extinct NAME: Now, look for a card that has either a "T" or "C" written on it.

Primitive armored fish; extinct.