Lab exercise dating rock strata One more step

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INTRODUCTION

Even so, relative age is useful. 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.

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For example, based on physical appearance, one could easily conclude that a mother is older than her baby, who is younger than his big brothers and sisters. Figure 2-A gives some background information on the individual fossils. Where the amounts of parent and daughter isotopes can be accurately measured, the ratio can be used to determine how old the rock is, as shown in the following activities. On a piece of notebook paper, each piece should be placed with the printed M facing down.

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Three-lobed body; burrowing, crawling, and swimming forms; extinct NAME: Squid-like animal with coiled, chambered shell; related to modern-day Nautilus.

Using the same reasoning about proportions as in Part 2b above, labs exercise dating rock strata can determine how old the pegmatite and the granite are.

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U is found in most igneous rocks. Primitive form of chordate; floating form with branched stalks; extinct.

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The team should place each marked piece so that "U" is showing. Principle of cross-cutting relations: Many rocks contain small amounts of unstable isotopes and the daughter isotopes into which they decay. There are two types of age determinations.

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Why can't you say exactly what the age of the rock is? Explore this link for additional information on the topics covered in this lesson: All of the fossils represented would be found in sedimentary rocks of marine origin.

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Knowing the absolute ages of a sequence of events automatically gives information about relative age; however, this does not work in reverse. This preview shows document pages 1 - 4.

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Return to top PART 1: Return to top Procedure Set B: Carnivore; air-breathing aquatic animal; extinct.