111-27

# 111-27 - GY 111 Lecture Notes D Haywick(2008-09 1 GY 111...

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GY 111 Lecture Notes D. Haywick (2008-09) 1 GY 111 Lecture Notes Bed Attitude (AKA – Strike and Dip) Lecture Goals : A) Beds in 3D space; the problem of orientation B) Strike and Dip C) Geological maps 1: horizontal and inclined bedding on map* Reference: Press et al., 2004, Chapter 11; Grotzinger et al., 2007, Chapter 7; p 152-154 GY 111 Lab manual Chapter 5 A) Beds in 3D space; the problem of orientation Up until now, I have been illustrating just about every important geological concept in two dimensions. For example, in the last lecture, I illustrated the Principle of Superposition with the adjacent cartoon: The thing is that beds are planes not lines and therefore, I really should have used a three dimensional or perspective cartoon to illustrate superposition. This one is more realistic, albeit a bit more annoying to draw on the fly during a lecture:

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GY 111 Lecture Notes D. Haywick (2008-09) 2 If you think about it, it is relatively easy to describe the orientation of horizontal bedding. All you have to say is "horizontal" and everyone immediately visualizes a flat surface ( e.g., a table, the floor, etc.). But we have a serious problem when it comes to describing the orientation of an inclined bed. Picture a tilted plane like the one drawn in the next cartoon. Were you to just say that the bed is inclined, every insightful person that you met (e.g., your fellow GY 111 classmates) would ask, " how much and in which direction?" After all, each of the beds in the next cartoon is inclined, but every one is inclined differently. Some are tilted more steeply than others. Some are tilted in different directions.
GY 111 Lecture Notes D. Haywick (2008-09) 3 Geologists, as I have said many times before, are clever people and we needed to come up with a way to describe bedding that everyone everywhere would understand. Even Vladimir in Russia!. The method that we came up with to standardize bed attitude is consequently clever and despite first appearances, relatively simple 1 . It does, however, require an understanding of simple trigonometry. However, as the Hitchhiker's Guide to the Galaxy 2 states; Don't Panic! B) Strike and Dip

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111-27 - GY 111 Lecture Notes D Haywick(2008-09 1 GY 111...

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