TEST YOUR KNOWLEDGE Answers on Pages 40 & 41
Robert G. Font, CPG-03953
robertfontphd@gmail.com
1. Microfossils are helpful in our ability to establish lithologic correlations and in determining depositional environments. Among these are minute aquatic crus- taceans that have calcareous or chitinous shells. What are these called?
a) Diatoms. b) Foraminifers. c) Radiolarians. d) Ostracods. e) Teensy-weensy creepy crawlers.
2. In drilling an exploratory wildcat well in a virgin area, we find a sand unit with a bell-shaped SP curve overlain by another sand with a funnel-shaped SP. What is a likely scenario to explain what we have found?
a) A turbidite deposit. b) A marine bar covered by a fluvial channel. c) A fluvial channel covered by lacustrine sequence. d) A fluvial channel overlain by a marine bar. e) I don’t know dude; this seems weird…
3. The average density (D) of planet Earth is 5.51 gcm-3 and its mean radius (R) is 6,371 km. What, then, is the Earth’s mass (M) in kg?
a) M 5.97 x 1024 kg. b) M 5.69 x 1026 kg. c) M 6.42 x 1023 kg. d) M 8.68 x 1025 kg. e) It’s big, man, real big
4. An “arthrodire” first appeared in the geologic record in Carboniferous time: a) True. b) False. c) Hey hombre, I don’t know who first complained, but the cure for arthrodire is drinking plenty of tequila….
5. In geomechanics applications and in the solution of structural and engineering geology problems, we are sometimes A. If A is the deviatoric stress tensor (reflect- ing the portion of the stress that deviates from a hydrostatic stress condition), we must determine the corresponding eigenvalues and eigenvectors to find the magnitude and direction of the principal deviatoric stresses. For simplicity, let’s consider two-dimensional stress. Given:
what are the eigenvalues in question? a) 2 and 1. b) 8 and 4. c) 6 and 4. d) 3 and 2. e) Eigen what? What insanity is this, dude? This is not cool, man!
38 TPG •
Jul.Aug.Sep 2020
www.aipg.org
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