Mapping & Petrography Appendices · appendix-04
Structural Analysis — Sheet 04
The fold-analysis sheet organises limb attitudes and applies a cylindrical-fold construction to estimate a hinge or fold axis. Its validity depends on correct identification of the two limbs, exclusion or separate treatment of fault-dragged beds, and adequate coverage along the mapped fold.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The fold-analysis sheet organises limb attitudes and applies a cylindrical-fold construction to estimate a hinge or fold axis. Its validity depends on correct identification of the two limbs, exclusion or separate treatment of fault-dragged beds, and adequate coverage along the mapped fold. A single idealised Fleuty-style diagram is a classification aid, not evidence of the local geometry. The observed poles should form a coherent girdle and the calculated axis should predict the mapped hinge orientation and plunge. Reporting sample number, dispersion and confidence would expose whether the fold is genuinely cylindrical or whether non-cylindrical geometry, multiple phases or sparse sampling require a more flexible model.
- Source
- Private geological appendix archive · controlled source record
- Location in source
- Source-linked record
- Image quality
- HD
- Record ID
- appendix-04
