Exam 5: Rocks Fossils and Time Making Sense of the Geologic Record

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The ____________________ ____________________ provides evidence for physical and biological events of Earth's history.

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geologic record

____________________ provide the only record of prehistoric life.

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Fossils

Two layers of limestone are found 200 kilometers apart. Give two lines of evidence that could show the layers are correlated.

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1. The rocks have similar lithological characteristics. (color, grain-size, angularity, sorting, and composition for the advanced student)
2. The same fossils are present in each layer indicating they are time correlated.
3. The sequence of rocks above and below each layer is identical to the sequence above and below the other layer.

Discuss William Smith's principle of fossil succession. Why is this principle important in relative geologic dating?

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Stratigraphy is irrelevant when examining relationships among metamorphic and igneous rocks.

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Lithostratigraphic properties yield stronger time correlations than biostratigraphic properties.

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Organisms in terrestrial environment have a better chance of being preserved as fossils.

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Why is the statement, "The Jurassic system lasted from 200-146 million years ago," incorrect? How would you correct it? In your explanation, be sure to distinguish between time-stratigraphic units and time units.

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Radiometrically dating a muscovite grain in a sandstone would give ____.

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A body of strata recognized on the basis of its fossil assemblage is a(n) ____________________ unit.

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Fossils that are easy to identify, widespread, and existed for a short time geologically are called ____________________.

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Although igneous rocks are the easiest to date radiometrically, most fossils are preserved in sedimentary rocks.

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Range zones ____.

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What would occur if all of the ice on Greenland and Antarctica melted?

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A marine transgression is a period of lower sea level.

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Preserved records of prehistoric organic activity such as tracks, trails, burrows, and nests are called ____.

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A body of sediment with distinctive physical, chemical, and biological properties is a facies.

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The rock layers in the Grand Canyon were deposited during marine transgressions and regressions.

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The period of time not represented by strata in an unconformity is a hiatus.

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When the remains of a buried organism dissolve and leave a cavity, the resulting structure is called a(n) ____________________.

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