Geologic 101 Time/Structures Homework Geology 101 Spring 2018 sec 1. 2 (circle o

Question

Geologic 101 Time/Structures Homework

Geology 101 Spring 2018 sec 1. 2 (circle one) Name Geologic Time/Structures Homework 19.5 points WSU ID You will need a scrantron form to answer the 21 multiple-choice questions. The relative age dating exercise for problem A and B will be hand graded. Fill out the name and WSU ID area of both the scantron and assignment sheet. Hand in both the scantron and the assignment sheet before the exam on Thursday, March 8. Homework turned in after the start of the exam will lose points and homework at the end of the class will be considered late. Homework on a separate sheet of paper will not be accepted for this assignment because you need both a scantron and this sheet. All multiple-choice questions are worth 0.5pts each. All rock units are sedimentary unless otherwise noted. KEY Hint: There is a worked example on the course web page for you to review. www.wsu.edu/-geology 101/sec1 On a separate piece of paper first determine the complete order of events from oldest (bottom) to youngest (top) before you label the events below All rocks are sedimentary unless otherwise noted Problem A Cross Section: (total 7 points) a) Label the following events from oldest (1) to youngest (7) (3.5pts) _-oceans rise or land subsides and deposition of units A,B,C,D,E forming UC1 UC2 Intrusion Y oceans rise or land subsides, deposition of F.Z forming unconformity UC2 Intrusion of X into unknown rock _ uplift and erosion of F and Z forming modern day surface uplift and erosion of unknown rock type exposing igneous unit X -uplift, tilting and erosion of units :Ignepus Granite A,B,C,D,E and Y lgneous 1) How can we tell the age of intrusion X relative to the age of intrusion Y? By using which principle? (0.5pt) a) intrusion X is older; principle of cross cutting relationships b) intrusion X is older; principle of superposition c) intrusion X is younger; principle of cross cutting relationships d) intrusion Y is younger; principle of superposition 2) What type of unconformity (UC1) is present between Intrusion X and Layer A? (0.5 pt) a) angular unconformity b) non conformity c) disconformity 3) What type of unconformity (UC2) exists between sedimentary layers A,B,C.D,E and sedimentary layer F? (0.5 pt). a) angular unconformity b) disconformity c) non-conformity

Explanation / Answer

(1) correct Option is (a) intrusion X is older; principles of cross cutting relationship. because Y is cuts across the strata of the pre-existing rock X.

(2) The correct option is (b) Nonconformity

When bedded sedimentary rocks overlie the non bedded igneous masses is called nonconformity.

(3) The correct option is (a) angular unconformity

The angular unconformity occor where the older series of beds have been tilted, deformed and eroded before the deposition of younger bed.

(4) The correct option is (d)

It is a wall like igneous body that cuts across the strata of the pre-existing rocks.

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