LAB9DATINGWORKSHEET

on Date: IOEVIQJ Name: LAB 9: DATING WORKSHEET GEOLOGY 1031 Two ways to describe age: 2. Stratigraphic principles result in an 3. Aboundary surface between two units produced by ¥rosion or non-deposition is called an ANCRATam \h,a 4. Unstable isotopes decay at a regular and predictable rate called the MMCO% 5. Tocalculate the age of a rock using radiometric dating, you must know the M_\_\SQ_ of the dating pair being used and the m}_{gm of the parent isotope remaining in the rock. B 6. In Cross Section 1, which of the following rock layers is the oldest? a) A g=+C = ey

7. Which geologic law or principle did you use to come to the conclusion you made in the previous question? The law of superposition b) The principle of cross-cutting relationships ) The principle of original horizontality d) The principle of unconformities Legend D igneous intrusion D sedimentary rock D metamorphic rock ~ unconformity 8. | Section 2, which geologic structure is the youngest? g € 9. Which geologic law or principle did you use to come to the conclusion you made in the previous question? ThéTaw of superposition b) e principle of cross-cutting relationships ¢) The principle of original horizontality d) _ The principle of unconformities @ andd 10. EXamine unconformities 1 and 2 in Cross Section 2. Which of the following statements about them is true? a) The older unconformity is a nonconformity, while the younger is an angular unconformity. The older unconformity is a disconformity, while the younger is a nonconformity. The older unconformity is a nonconformity, while the younger is a duoonformutv ) The older unconformity is an angular uncanformity, while the younge