TEST YOUR KNOWLEDGE Answers on Page 32
Robert G. Font, CPG-03953
rgfont@cs.com
1. The stratigraphic principles of “superposition”, “original initial horizontality” and “original lateral continuity” are attrib- uted to this important early geologist:
a) William Smith. b) Abraham G. Werner. c) Nicolaus Steno.
2. The foraminifera Globorotalia menardii has been used as a climate indicator. Which of the following statements is correct? a) Shells are larger and more abundant during warmer periods. b) Shells are larger and more abundant during colder periods. c) Globo what?
3. It is a characteristic of “quick clays” to have values of “liquidity index” (IL) of 1.0 or greater. How is the “liquidity index” defined?
a) (Liquid limit – Plastic limit) / Plasticity Index. b) Plasticity index / Percent Clay. c) (Natural Water Content – Plastic Limit) / Plasticity Index.
4. In our studies of rock mechanics and structural geology, we often deal with the concepts of the stress vector (force per unit area at a point on a plane) and the stress tensor (defining the overall state of stress). Find the stress vector (S) if the unit normal vector for the plane (n) and the stress tensor (T) are:
n = (2/3) x – (2/3) y + (1/3) z 7 T = -2 0 -2
0 5 0 0
(2) 4
a) S = 3 x – (14/3) y + 2 z b) S = 2 x – (16/5) y c) S = 4 x – (10/3) y d) Are you crazy? You think I am Einstein’s brother or something?
5. An isolated block of a nappe overlying autochthonous rocks defines: a) An “inselberg.” b) A “klippe.” c) A “monadnock.” d) A “fenster.”
(1)
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