Creating and Analyzing Folds in Visible Geology
Summary
This activity utilizes Visible Geology to analyze folds on a stereonet using a pi-girdle technique. The assignment starts with students following a simple example, and then creating their own and sharing it with a partner. Students are introduced to concepts of fold axis, axial plane, interlimb angle in three-visualizations: model view, cross-section view, and stereonet view. By moving between these media students are able to draw deeper connections with respect to folding and to stereonet interpretation.
Collapse
Context
Audience
The activity is for use in an undergraduate structural geology course.
Skills and concepts that students must have mastered
Students should be familiar with basic stereonet interpretation and terminology, students should have been introduced to describing cylindrical folds. Both of these skills will be enhanced during the exercise.
How the activity is situated in the course
This assignment can be used as a stand-alone exercise in a laboratory setting or as a homework exercise.
Goals
Content/concepts goals for this activity
This assignment will enhance the understanding of a stereonet, and how it can be used for interpretation of folds. Additionally, goals include strengthening stereonet skills, fold terminology, and visualization. Visualization and creation of block models using Visible Geology.
Higher order thinking skills goals for this activity
Comparing three different views on the same data allows students to synthesize links between geologic orientation and the abstraction of the stereonet. Students should have a better understanding of poles, orthogonality, and other geometrical concepts at play. This should be represented in part by their explanation of conical folds.
Other skills goals for this activity
This activity is best completed in groups, with students creating block models, and sharing and testing other students in the group. Allowing students to create the questions (in the framework of this assignment) enhances the learning goals.
Description and Teaching Materials
The assignment can be completed as a lab assignment, or as a homework assignment (requires slightly more coordination). Students need access to a computer with a modern HTML5-Compliant web browser (Chrome or FireFox). The entire assignment is attached and can be modified to suit the particular needs of the class.
Lab Asignment - Creating and Analyzing Folds in Visible Geology (Acrobat (PDF) 95kB Jun27 12)Teaching Notes and Tips
It is helpful if the instructors are familiar with Visible Geology, and the various functions that are available. Video tutorials are available through YouTube for introduction to the different features in the Stereonet Program.
Share your modifications and improvements to this activity through the Community Contribution Tool »
Assessment
Each of the questions can be graded as well as the print outs. More weight should be given to the open ended questions.