The white granite of the Idaho Batholith near Boise, Idaho, contains dark gray x
ID: 112218 • Letter: T
Question
The white granite of the Idaho Batholith near Boise, Idaho, contains dark gray xenoliths of metamorphic material. Which is order? How do you know? A) Granite: the principle of superposition B) Xenoliths: the principle of cross-cutting relations C) Granite: the principle of unconformities D) Xenoliths: the principle of inclusions Which of the following would make the best index fossil: olenellus (522-510 million years ago), Flexicalymene (~490-418 million years ago), and phacops (~418-360 million years ago). A) Olenellus B) Flexicalymene C) Phacops Assume that a modern rabbit dies and becomes fossilized. Which of the following groups of animals would represent an accurate fossil assemblage to find with that rabbit?Explanation / Answer
43. Answer: A) Olenellus
Explanation: Index fossils are the fossils of organisms that are common and lived a short life. Index fossils also known as guide fossils, indicator fossils or zone fossils because these fossils are used to define and identify geologic periods. some of the common xxamples of index fossils include: Ammonites were common during the Mesozoic Era (245 to 65 million years ago), Trilobite fossils, K-T extinction (65 million years ago).
Olenellus, genus of trilobites common in but restricted to Early Cambrian rocks (542 million to 521 million years ago) and thus a useful guide fossil for the Early Cambrian.
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