This section deals with folds which are one of the main products of ductile deformation. The two presentations: ‘Introduction to folds’ and ‘Terminology of folds’ cover some practical aspects necessary to work with folds and the describing folds exercise gives the chance to practice them.
You can see a fold in 3D in the indoor mapping exercise and take measurements from it and then plot them on a map.
In addition to these set activities all the answers are available as PowerPoint presentations so that you can change them to suit your own needs and all the seismic images are available as A4 printouts.
Introduction to FoldsDownload this presentation in PowerPoint format (5.8 MB ppt)
Terminology of FoldsDownload this presentation in PowerPoint format (771 KB ppt)
Describing folds: annotating folds with the correct terms
This exercise gives the opportunity to identify different types of folded structures, use some of the terms that describe folds and to label the different parts correctly.
There are two versions of the exercise; in version 1 you have to interpret horizons and structures on all the seismic profiles, with version 2 some of the interpretation has already been done for you. There is also a PowerPoint presentation containing the suggested answer and some extension activities.
- Version 1: Worksheet (2.2 MB doc)
- Version 2: Worksheet (2.2 MB doc)
- Version 1: image A (274 KB jpg), image B (272 KB jpg), image C (395 KB jpg), image D (476 KB jpg)
- Version 2: image D (480 KB jpg)
- Suggested answer (3.2 MB ppt)
Indoor Mapping: plotting information from seismic profiles on to a map
This exercise gives the opportunity identify and measure features on a three dimensional image of a fold and practice transferring this information to a map. The model is available in colour or greyscale and there are two versions of the exercise; version 1 is more challenging than version 2. There is also a PowerPoint presentation containing the suggested answer and some extension activities.