EXAM 3

GLG412 Name __________________

May 5, 2007 Grade _________

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Part 1 - Please select the correct answer to the following questions (40 pts.).

1) Which of the following dating techniques can be applied to Quaternary corral reefs?

a) Paleomagnetism

b) Fission track

c) Potassium-Argon

d) Carbon 14

2) Sea level was highest approximately

a) 150,000 years ago.

b) 120,000 years ago.

c) 55,000 years ago.

d) 20,000 years ago.

3) The range of the uranium series disequilibrium method of dating is about

a) 1,000 to 350,000 years ago.

b) 10,000 to 350,000 years ago.

c) 100,000 to 500,000 years ago.

d) 10,000 to 500,000 years ago.

4) In the Midwest the Sangamonian interglacial period occurred about .

a) 150,000 to 55,000 years ago.

b) 140,000 to 65,000 years ago.

c) 130,000 to 75,000 years ago.

d) 120,000 to 85,000 years ago.

5) Prior to late Cenozoic glaciation, the Teays-Mahomet drainage system drained

a) southward into the Gulf of Mexico

b) northward into Hudson Bay

c) eastward into the central Atlantic

d) northeastward into the north Atlantic

6) Based on terrestrial data the Great Lakes region was glaciated during the late Cenozoic about

a) four times

b) six times

c) twelve times

d) fifteen times

8) The youngest glacial sediments in the Great Lakes basin occurs near the city of

a) Detroit

b) Cheboygen

c) Marquette

d) Mackinaw City

e) Port Huron

9) The Brunes/Matuyama magnetic reversal occurred about

a) 120,000 years ago.

b) 240,000years ago.

c) 500,000 years ago.

d) 780,000 years ago.

e) 1,800,000 years ago.

10) The earliest record for Late Cenozoic glaciation in North America occurs in

a) Baffin Island.

b) Illinois.

c) Quebec.

d) Alaska.

e) Montana.

Part 2 - Please fill in the blank (40 pts.).

10) Seawater is generally _____________ in ¹⁶O relative to glacier ice. The difference in the ¹⁸O composition between the two is ________________ during a glacial period..

11) The parent isotope of ¹⁴C is ________. The parent isotope of ⁴⁰Ar is _________.

12) The thermoluminescence method of dating works well with what minerals? ____________ and ____________.

13) What are two problems generally associated with the amino acid racemization method of dating? _________________________ and ____________________________

__________________ is due to regional variations in Earth=s gravity field and proximity of major ice sheets, whereas ________________ is due to hydrostatic loading of water upon ocean floors and continental shelves.

14) What factors affected the sealevel along the western coast of Canada during the last 20,000 years? ______________________, ______________________, and ________________________.

15) The Great Lakes were first glaciated about ______________ years ago. How many times did the ice margin significantly readvance during retreat of the Wisconsin glaciation from the Great Lakes basin? __________ Glacier ice left the Great Lakes basin for the last time about ________________ years ago.

16) Lake Erie in underlain mainly by ______________. The islands that extend east from the upper peninsular of Michigan are underlain by mainly by _______________.

17) The oldest glacial deposit in the Great Lakes basin is located near ______________. The age of that deposit is probably _______________.

Part 3 - Please answer the following question (20 pts.).

18) Below, carefully draw a cross section of the Kalamazoo moraine showing it general topography and show with an arrow the direction of ice flow. Based on your experience in the field show and label what type of glacial sediments might underlie the moraine surface, the area distal to the moraine, and the area proximal to the moraine. (8)

West East

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20) In the figure below carefully draw a curve showing the general trend in sealevel since about 20,000 yrs BP. (8)