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LAB3_geo_maps

# LAB3_geo_maps - Structural Geology Lab 3 Geologic Maps and...

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16 Structural Geology Lab 3: Geologic Maps and Cross-sections I. Geologic Maps A. Topography (surface elevation) + aerial distribution of rock units 1. geologic contacts: boundaries between rock units as depicted on maps a. strike and dip of beds b. Defining mappable units (1) rock characteristics that differ from one another (a) lithology / facies (b) texture (c) composition (d) stratigraphic age i) fossils ii) superposition iii) radiometric dating 2. Faults, fold axes, fractures, lineations, foliations II. Structural Attitudes from Outcrop Patterns A. strike = lines on surface of bed of equal elevation 1. Technique: find two points on map where a given geologic contact lies at the same elevation a. strike line = line connecting two points of equal elelvation on geologic contact b. Dip angle and direction (1) draw line perpendicular to strike line of given elevation to point of contact of known elevation 2 (2) determine vertical distance between two points (3) determine horizontal distance between two points (4) Tan (dip) = V/H , use inv tan function to determine angle III. Stratigraphic Thickness from Outcrop Patterns A. Trigonometric Solutions 1. Basic Data: a. h = width of bed outcrop measured perpendicular to strike b. dip of bed c. t = thickness of bed measured perpendicular to bedding plane = unknown variable in this case 2. Determining Stratigraphic Thickness on Flat Terrain a.

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