5. The cross-section below shows a series horizontal sedimentary and volcanic rocks. The volcanic ash layers have been dated, and the ages are given in millions of years (Ma). The sedimentary rocks contain fossils. Using the information in the cross- section, determine the possible age (or age range) of each fossil. For example, crinoids could be found in rocks from the past ~450 Ma. But, because the unit containing crinoids in the picture below is located between two dated ash layers, we know that this unit is between 400 and 280 million years old (as filled out for you below). Use the Principle of Superposition to help you figure this out. Sample Possible age range (a) Crinoid (b) Brachiopod (c) Dinosaur (d) Ammonite (e) Wood (f) Trilobite 400-280 Ma

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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5. The cross-section below shows a series horizontal sedimentary and volcanic rocks.
The volcanic ash layers have been dated, and the ages are given in millions of years
(Ma). The sedimentary rocks contain fossils. Using the information in the cross-
section, determine the possible age (or age range) of each fossil. For example,
crinoids could be found in rocks from the past ~450 Ma. But, because the unit
containing crinoids in the picture below is located between two dated ash layers, we
know that this unit is between 400 and 280 million years old (as filled out for you
below). Use the Principle of Superposition to help you figure this out.
Sample
Possible age range
(a) Crinoid
(b) Brachiopod
(c) Dinosaur
(d) Ammonite
(e) Wood
(f) Trilobite
Fossil fish
Fossil wood
Volcanic ash layer - 48 Ma
Dinosaur fossils
Volcanic ash layer-72 Ma
Ammonite fossils
Lobster fossil
Brachiopod fossils
Volcanic ash layer - 280 Ma
Crinoid fossils
Volcanic ash layer-400 Ma
Trilobite fossils
400-280 Ma
Transcribed Image Text:5. The cross-section below shows a series horizontal sedimentary and volcanic rocks. The volcanic ash layers have been dated, and the ages are given in millions of years (Ma). The sedimentary rocks contain fossils. Using the information in the cross- section, determine the possible age (or age range) of each fossil. For example, crinoids could be found in rocks from the past ~450 Ma. But, because the unit containing crinoids in the picture below is located between two dated ash layers, we know that this unit is between 400 and 280 million years old (as filled out for you below). Use the Principle of Superposition to help you figure this out. Sample Possible age range (a) Crinoid (b) Brachiopod (c) Dinosaur (d) Ammonite (e) Wood (f) Trilobite Fossil fish Fossil wood Volcanic ash layer - 48 Ma Dinosaur fossils Volcanic ash layer-72 Ma Ammonite fossils Lobster fossil Brachiopod fossils Volcanic ash layer - 280 Ma Crinoid fossils Volcanic ash layer-400 Ma Trilobite fossils 400-280 Ma
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