Q.4. A particular sequence of sedimentary rocks is found to contain the following assemblage of microfossils. Answer following questions about this sequence (10 points): Microfossil groups List the geologic periods represented by the groups in the layer Position in vertical sequence Layer A (Top) Pollen Layer B Pollen, ostracods, Layer C Diatoms, Foraminifera, Layer D Ostracods, Coccoliths, and, Foraminifera Bryozoa, Foraminifera, Trilobites Layer E (Bottom) (Age ranges: Bryozoa- Silurian-Devonian; Trilobites- Ordovician-Devonian; Conodonts- Permian; Ostracods-Cambrian to Recent; Diatoms-Cretaceous; Foraminifera-Cambrian to Recent; Coccoliths-Jurassic-Recent; Pollen-Eocene) Using the microfossil groups in this sedimentary sequence, answer the following questions: a. Fill in the geologic periods for the ranges of the groups in each layer (4 points). b. What is the type of contact between layer E and D and Cand B. -(2 ponits) c. From what you know about the environments which these groups inhabit, is layer B deposited under marine, mixed or continental condition? ( 2 points) d. What is the age of the sequence (2 points)
Q.4. A particular sequence of sedimentary rocks is found to contain the following assemblage of microfossils. Answer following questions about this sequence (10 points): Microfossil groups List the geologic periods represented by the groups in the layer Position in vertical sequence Layer A (Top) Pollen Layer B Pollen, ostracods, Layer C Diatoms, Foraminifera, Layer D Ostracods, Coccoliths, and, Foraminifera Bryozoa, Foraminifera, Trilobites Layer E (Bottom) (Age ranges: Bryozoa- Silurian-Devonian; Trilobites- Ordovician-Devonian; Conodonts- Permian; Ostracods-Cambrian to Recent; Diatoms-Cretaceous; Foraminifera-Cambrian to Recent; Coccoliths-Jurassic-Recent; Pollen-Eocene) Using the microfossil groups in this sedimentary sequence, answer the following questions: a. Fill in the geologic periods for the ranges of the groups in each layer (4 points). b. What is the type of contact between layer E and D and Cand B. -(2 ponits) c. From what you know about the environments which these groups inhabit, is layer B deposited under marine, mixed or continental condition? ( 2 points) d. What is the age of the sequence (2 points)
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
Problem 1LR
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Transcribed Image Text:Q.4. A particular sequence of sedimentary rocks is found to contain the following
assemblage of microfossils. Answer following questions about this sequence (10 points):
List the geologie
periods represented
by the groups in the
layer
Position in vertical
Microfossil groups
sequence
Layer A (Top)
Pollen
Layer B
Pollen, ostracods,
Layer C
Diatoms, Foraminifera,
Layer D
Ostracods, Coccoliths, and,
Foraminifera
Layer E (Bottom)
Bryozoa, Foraminifera,
Trilobites
(Age ranges: Bryozoa- Silurian-Devonian; Trilobites- Ordovician-Devonian;
Conodonts- Permian; Ostracods-Cambrian to Recent; Diatoms-Cretaceous;
Foraminifera-Cambrian to Recent; Coccoliths-Jurassic-Recent; Pollen-Eocene)
Using the microfossil groups in this sedimentary sequence, answer the
following questions:
a. Fill in the geologic periods for the ranges of the groups in each layer (4 points).
b. What is the type of contact between layer E and D
and Cand
B.
-(2 ponits)
c. From what you know about the environments which these groups inhabit, is
layer B deposited under marine, mixed or continental condition? ( 2 points)
d. What is the age of the sequence (2 points)
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