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Problem 6 EQ: WHAT IS A GEOLOGIC MAP?

Problem 6 EQ: WHAT IS A GEOLOGIC MAP?. Stratigraphy and Structure. Geologic Map of Georgia. What are the features of geologic maps?. Surface geology Under soil Rock formations lithology fm. contacts age (by period)

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Problem 6 EQ: WHAT IS A GEOLOGIC MAP?

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  1. Problem 6 EQ: WHAT IS A GEOLOGIC MAP? Stratigraphy and Structure

  2. Geologic Map of Georgia

  3. What are the features of geologic maps? Surface geology Under soil Rock formations lithology fm. contacts age (by period) symbol – period symbol in caps, fm. name as subscript (CC, PB, TO). attitude – dip and strike symbols ( ). structure of rock strata faults folds – anticlines and synclines

  4. North into the map What is Dip and Strike? 30 Bedding plane Strike is the direction of the line that a horizontal plane makes when it intersects the bedding plane. Dip is the direction and angle of the plunging bedding plane perpendicular to strike. What is above strike? _____ What is dip? ______

  5. The relative sequence of rocks found in a given area. It shows rock types, age, and thickness. What is a Geologic Column? Tertiary “f” formation Cretaceous “e” formatiom Cretaceous “d” formation Cretaceous “c” formation Jurassic “b” formation Jurassic “a” formation Tf Ke Kd Kc Jb Ja

  6. Geologic Map of Lower Slobovia N A 45 Ja Jb Kc Kd Ke Tf 45 B 0 1 mile

  7. What is a Geologic Block Diagram? A B C D E F Front of block is a geologic cross section

  8. Geologic Map of Happy Valley N A B Ke Kd Kc Jb Kc Kd 0 0.1 miles

  9. e d c b c d e Geologic Cross Section of Happy Valley An eroded anticline Fold axis (parallel to line of symmetry) Plunging fold (axis of fold dips) Dip directions

  10. Anticline

  11. Eroded anticline Erosion resistant ridges are called hogbacks. Sandstones form hogbacks. Shales form valleys. Limestones form valleys in E. US, ridges in W. US

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