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Correlation Of Rock Layers

Test Description: Factors in fossil formation, correlation of rock layers by index fossils and volcanic ash.

Instructions: Answer all questions to get your test result.

1) Layers of volcanic ash often serve as useful geologic time markers because ash layers usually

Acan be sampled easily Bdarken with age Cdeposit quickly over a wide area Dare older than the surrounding rock

2) Which kind of bedrock would most likely contain fossils?

Aa mass of granite in the core of a mountain Ba basalt lava flow from an ancient volcano Ca series of alternating layers of shale and sandstone Da high-grade metamorphic rock layer made from mixed igneous and sedimentary layers

3) In order for an organism to be used as an index fossil, the organism must have been geographically widespread and must have

Alived on land Bexisted for a geologically short time Cbeen preserved by volcanic ash Dlived in shallow water

4) Sedimentary rock units several hundred kilometers apart could best be correlated by comparing the

Afossils found in each rock unit Bdegree of weathering and erosion of each rock unit Ccolor and thickness of each rock unit Dtypes of soil located above each rock unit

5) A fossil is not likely to be found in

Ashale Blimestone Cbasalt Dsandstone

6) Which bedrock feature is most useful in correlating sedimentary bedrock in one area with sedimentary bedrock in another area?

Atexture Bcementing agent Cindex fossils Dcolor

7) Which bedrock would be most likely to contain fossils?

APrecambrian granite BCambrian shale CMiddle-Proterozoic quartzite DPleistocene basalt

8) Which rock type most often contains fossils?

Alimestone Bmetaconglomerate Cgabbro Dquartzite

9) Which processes most often cause fossil evidence to be preserved in rock?

Afolding and metamorphism Bdeposition and cementation Cmelting and faulting Dweathering and erosion

10) Living corals are found in warm, shallow seas. Coral fossils have been found in the sedimentary rocks of Alaska. These findings suggest that

Acoral usually develops in cold climates Bocean currents carried the coral to Alaska CAlaska's cold climate fossilized the coral DAlaska once had a tropical marine environment

*select an answer for all questions

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