April 18, 2023 GLG510 Advanced Structural Geology
Fold analysis and cross sections
Marshak and Mitra
Marshak and Mitra
Beta diagram: fold axis at intersection of bedding planes
Marshak and Mitra
Marshak and Mitra
Marshak and Mitra
Marshak and Mitra
Cross sections
Davis and Reynolds, 2000
Basic steps in the preparation of a geologic cross section:
1) Choose appropriate line of section
2) Produce topographic profile along it.
3) Transfer marker attitudes (contacts and within units)
4) Correct for apparent dip in line of section (if line <75 degrees from strike)
5) Draw units; maintain stratigraphic thickness where possible; use deformation patterns observed from field to guide interpretation. Continue lines into air and below groundDavis and Reynolds, 2000
Construction: Busk method
Marshak and Mitra
Construction: Busk method
Marshak and Mitra
Construction: Kink band method
Marshak and Mitra
Construction: Kink band method
Marshak and Mitra