PLP2000

PLP 2000 Lecture 1:

Orientation Geologic Time and Techniques

Please turn off your cell phone!

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Orientation

Instructor Dr. Brantlee Spakes Richter 2519 Fifield Hall M-F, 2:30-3:30, and by appointment Use email in Canvas!

https://lss.at.ufl.edu/ Assistants Adriana, Morgan

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sami hammer

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Orientation Syllabus Online at Canvas website

https://lss.at.ufl.edu/ In front of Student Guide

Text Student Guide (Richter) Available at Target Copy

1412 W University Ave. 3422 SW Archer Rd.

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Orientation Class Website (Canvas): https://lss.at.ufl.edu/

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Orientation

Exams and Quizzes 4 Exams (100 points each) Daily Quizzes (100 points total) Bonus

Survey (4 points) Museum Quiz (up to 15 points)

Grades Daily Quiz grade replaces lowest of 1st three

exams Bonus points added to total points earned Total points /400 = Final grade

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Orientation

Daily Quizzes Quiz forms available as you come in

Must be on time to receive a quiz form May not take more than one form

Hand in quiz on your way out May not be handed in early May not hand in more than one quiz

Question will be from that days lecture Quiz grades may be lost for disruptive

behavior or cheating*

*Handing in a wrongfully obtained quiz form

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Orientation Attendance Excused absences, may require

documentation Illness Emergency

Excused only with advance notice Official UF athletic or academic events Professional events Religious holidays

Not Excused Vacation, concert, club meeting, study group,

giving someone a ride, lunch date, bad hair day,

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Orientation

Rule #1: Dont be rude. Talking during lecture Cell phones Computers ANYTHING that diverts attention

Violations of Rule #1 1st Strike: Loss of quiz grade for the day 2nd Strike: Loss of quiz grades for the class

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Orientation

Rule #2: Academic Integrity You have signed a contract:

I understand that the University of Florida expects its students to be honest in all their academic work. I agree to adhere to this commitment to academic honest and understand that my failure to comply with this commitment may result in disciplinary action up to and including expulsion from the University.

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Is this class hard? Summer, 2012

Summer, 2013

Summer, 2014

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Course Overview

Survey of the History of Life on Earth Mechanics of living things Diversity of life Interactions among living things Biology and civilizations Scientific progress (and regress) Current issues and limitations

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Earth You are here

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Earth

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Geology Terms

Crust Thinnest, outer layer Where the life is

Lithosphere Crust + Upper (solid) Mantle Floats on the Asthenosphere

Asthenosphere Molten, semi-liquid Has currents (moves around)

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Plate Tectonics

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Continental Plates

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Biology on a Shifting Planet

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How old is it? A B

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How old is it? Relative Dating

A

B

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Layers & Disturbances

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Layers & Disturbances

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Relative Dating A B

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Relative Dating

A

B

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Relative Dating

A

C B

D E

F A

B

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Absolute Dating

Uses known decay rates of radioactive elements Stable characteristic Best for rocks formed by

melting (igneous, some metamorphic)

Not good for sedimentary rocks

Calculated date is not relative

1. Unstable isotope forms in molten rock

2. Particles are lost at a steady, predictable rate to form daughter isotopes

3. Process continues until final, stable isotope is formed

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How much unstable isotope (%) is found in molten rock? How fast does the unstable isotope decay? How much of the unstable isotope is in my rock sample?

Molten Rock

This is how much unstable isotope occurs

in molten rock.

100% -

50% -

25% -

75% -

Time after solidifying (billion years) 0 1 2 3 4 5 6 7

37.5%

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Absolute Dating

Radioactive decay occurs at a constant rate

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Carbon Dating

12C

14C

1. Cosmic rays in atmosphere cause formation of unstable C-14

2. Ratios of carbon forms are constant in atmosphere

3. Living organisms incorporate all carbon forms into cells

4. At death, incorporation stops, but C-14 decay continues

5. Measurable C-14 remains for ~50,000 years

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Summary

Syllabus & Mechanics Take online quiz!

Open through 1st week 3 Tries for a perfect score!

Geology Shifting stage & basic terms Relative vs. Absolute dating

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Quiz Questions

Dont forget to take your

Lecture #1 quiz

on the class website!