GEOLOGY EXAM II CHAPTER 10 – Flashcards
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James HUtton "father of geology" put forth principle of
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Uniformitarianism
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Period names on the geologic time scale, such as Devonian and Permian, provide examples of
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Relative Age
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In an undisturbed swquence of sed. rocks younger layers overlay older according to princeiple of
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Superposition
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WHICH of the following is a direct results of gravity?
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Cross-cutting relationships BUT direct result of sedimentation would be better way to word
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Relative ages expressed on the geologic time scale primarily resulted form the study of
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fossil content and spartial relationships among SED rocks
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Numerical ages for boundaries between time units on the geologic time scale primarily resulted from study of BLANK in conjunction with relative age data
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Radiometric dating of IGNEOUS rocks
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Within the worlds sed. rocks, fossils...
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OCCUR IN AN ORDERED SEQUENCe
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The surface below sed. rocks that overlie igneous or meta. rocks is called
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NON conformity
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Buried erosional surfaces btwn. parallel sedimentary strata are termed
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Disconformities
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Most reliable method of correlation for det. age equivalence among bodies rock that are physically isolated by vast distances
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Fossil correlation
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Which eon of geologic time is represented by rocks containing abundant shelly fossils
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Phanerozoic
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After passage of three half-lives whats (how much unreacted) in an unaltered state
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one eight
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A measured radiometric age for a mineral crystal w/in an ig. rock denotes the amt. of time that has passed since the....
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temperature of the crystal became equal to closure temp. for the mineral
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Radiometric dates applied to sed. rocks produce ages that are
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too young because loss of daugher result in ages being too young.
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Inclusions
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Principle which states that if a mass of rock contains fragments of an adjacent rock body, the mass containing the inclusions must be younger.
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Lord Kelvin estimated age of Earth, utilizing number of assumptions. Which one was reason he was wrong
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NO NEW HEAT HAS BEEN ADDED TO THE EARTH SINCE INITIAL FORMATION
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Numerical ages for recent geologic events can sometimes be determined by the study of...
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layering, annual growth in tress, seasonal layering (all of the above)
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If horizontal sed. strata overlie tilted strata the surface btwn the horizontal and tilted strata must be
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Angular uncoformity
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Which of the following always varies among multiple isotopes of a single element
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atomic mass # rather then atomic # which is always the same
