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Goals
• To familiarize you with the 3-dimensionality of geological structures in the field
• Provide you with simple rules to use in geologic mapping of structures
Any structures will intersect an irregular topographyTry picturing how will a horizontal layer cut this relief
• Let us now put the real topography aside and step into the realm of “primary” geologic structures - layering of sedimentary units, intrusions, viewed in an idealized 3D framework
• Let us know try to drape structures onto topography and come up with some simple rules for the way they will plot on maps.
To keep things simple for now, I will deal mainly with planes and not with lines.
So what can a plane be? A bed, a fault, a dike, a sill an unconformity, anything that is planar.
• So then what is a geological map?
An overlay of geologic structures (e.g. like the planes shown here on the 2D topographic map). Let’s take a look.
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