Fossils and Geological Dating
Medium-difficulty multiple-choice quiz on fossils, relative dating, absolute dating, and radiometric dating principles and applications.
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Quiz Questions & Answers
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Question 1: What key insight does the principle of faunal succession provide when studying sedimentary rock layers?
Layered fossil assemblages succeed one another in a reliable vertical order
Older fossils are always smaller than newer fossils
All fossils in one layer are the same age worldwide
Fossils can only form in igneous rocks
Question 2: Which method is an example of absolute dating rather than relative dating?
Applying the law of superposition to order layers
Radiocarbon dating of organic remains
Using index fossils to correlate strata
Comparing grain size between beds
Question 3: When is radiometric dating likely to give an unreliable age?
When layers are undisturbed and continuous
When fossils are used instead of minerals
When using multiple dating methods that agree
When the sample experienced recent heating or chemical alteration
Question 4: Which fossil characteristic makes an organism a good index fossil for relative dating?
Restricted to one small basin and abundant
Only preserved in metamorphic rocks
Wide geographic distribution and short stratigraphic range
Very large body size and slow evolutionary change
Question 5: How does the law of superposition help build a relative timescale in sedimentary sequences?
It shows that younger rocks are always metamorphosed
It assigns exact calendar ages to each layer
It proves fossils formed immediately after deposition
You infer that lower layers were deposited before higher layers
Question 6: What conceptual advantage does cross-cutting relationships provide in geologic interpretation?
All cutting features formed before deposition
Features that cut others are younger than the features they cut
Only applies to igneous intrusions
It provides radiometric ages directly
Question 7: Which statement best counters the myth that radiocarbon dating can date any rock or fossil of any age?
Radiocarbon measures organic carbon and is limited to relatively recent once-living material
Radiocarbon gives exact calendar years without uncertainty
Radiocarbon works best on metal-rich ores
Radiocarbon can date igneous minerals reliably
Question 8: In a scenario where volcanic ash layers are interbedded with fossil-bearing sediments, what combined approach yields the most robust chronology?
Use radiometric dating on the ash and correlate fossils for regional context
Use only the law of superposition and avoid lab methods
Ignore the ash since it has no stratigraphic value
Rely only on fossil identification for absolute ages