This project is designed as a more advanced mapping exercise in a typical undergraduate capstone field course. It could also be used as an introductory laboratory exercise by removing some of the additional components, like the cross section, lithologic descriptions, or memoir/summary of the geology.

Students should know how to make basic rock interpretations and environmental interpretations from lithologic data. They should know what a geologic map looks like and represents. They should know what a cross section is, but will likely need some guidance on how to construct a cross section. Students typically require some guidance on how to write an organized and logical memoir/summary of the geology.

This would be a more advanced mapping exercise in a capstone geology field course. The geology of the area consists of a folded stratigraphic sequence, and it reinforces the mechanics of creating a geologic map, drawing a moderately complex cross section, and writing supporting documentation.

Activity Length

This would likely be the equivalent of a 3-day field mapping exercise. Longer if students don't spend full days on the exercise.

Exercise Goals:

1. In Google Earth, virtually traverse the full field area, visiting outcrops (indicated by colored orientation symbols or dots) and collecting field data.
2. Build a geologic map in Google Earth by drawing contacts between lithologic units. Draw polygons, colored by unit, to represent the interpreted regions for each lithologic unit. Fold axes and/or faults should be indicated. Upon completion, the full mapping area, as denoted by the large yellow polygon, should be colored. Neatness counts!
3. Interpret the geology of the field area by writing detailed descriptions of the lithologic units, constructing a cross-section that interprets the geology of the area, and writing a memoir/summary of the geologic history of the field area.

This exercise incorporates:

1. Analyzing and interpreting field data provided virtually
2. Synthesizing data to create a geologic map and cross section interpretation of the geology of the field area
3. Synthesizing background and field data to write a summary of the geology and geologic history of the field area.

This exercise incorporates spatial thinking skills in construction of a geologic map and vertical cross section. It also incorporates professional writing skills in writing lithologic descriptions and a summary of the geology of the area.

Exercise Files:

Google Earth KML exercise file: Google Earth KML exercise file
Exercise Instructions file: Exercise Instructions handout
Supplementary basemaps file: Supplementary basemaps

Exercise Description:

The Virtual Geologic Mapping Exercise at McCauley, WV focuses on a 7 square kilometer field area just east of the town of Baker in northeastern West Virginia (Figure 1; approximate latitude: 39.05˚, longitude: -78.72˚). The basic geology consists of a layered sequence of Silurian to Devonian clastic and carbonate rocks that are complexly folded. Virtual field investigations and construction of a geologic map will be facilitated by using the Google Earth virtual globe. The exercise works best with the web version of Google Earth, which can be accessed using the Chrome, Firefox, Opera, or Edge browsers.

Students open a KML file in Google Earth, which includes outcrop data collected from the actual McCauley, WV field area. In Google Earth, outcrop data appears in the form of orientation symbols when students zoom close to the ground surface. Details for each virtual outcrop can be seen by clicking on the symbol. Students use this data to draw contacts and fold traces with the line tool in Google Earth, and then draw colored polygons to represent the aerial extents of the lithologic units. The working and completed geologic maps can be saved as KML files on the student's desktop.

Deliverables for the exercise include:

1. A completed geologic map (as a KML file)
2. A document with lithologic descriptions of each unit in the field area
3. A completed cross section that displays the student's interpretation of the geologic structure of the field area
4. A document that summarizes the geology and geologic history of the field area.

Technology Needs

Web-based Google Earth is the preferred medium for creating the geologic map, although desktop Google Earth will work as well.
A drawing program like Powerpoint, Illustrator, or Google Slides is needed to construct a cross section.
A word processing program like Microsoft Word or Google Docs is needed to write the lithologic descriptions and the memoir/summary of the geology.

When using the Google Earth KML file, students need to zoom close to the ground surface to see the outcrops (orientation symbols). When students click on a symbol, outcrop information will appear in a pop-up window. Most of the pop-up windows include field or outcrop photos. Students should draw contacts between lithologic units and faults as lines in Google Earth, and then draw colored polygons in Google Earth to represent the aerial extent of the lithologic units within the field area. Students can also mark important points with Placemarks. Note that anything the students draw will appear at all zoom levels, but the outcrop data (orientation symbols) only appear when zoomed close to the ground surface. Students can iteratively save their working and final geologic maps from Google Earth to their desktop. Students should save multiple versions of their map as they work on it, so that they have backups.

The cross section can be drawn in a separate drafting program, and should not be drawn until a student's geologic map is completed. Students should use lithologic information and photos from the outcrops to complete their lithologic descriptions. The memoir/summary should describe the location of the field area, the depositional setting of the units, and a brief geologic history of the area.

An Instructor packet with examples of the Deliverables can be requested from the author at: whitmesj@jmu.edu.

This exercise is complementary to the Virtual Geologic Mapping Exercise at Lough Fee, available here: Lough Fee Exercise

Students turn in a KML file of their completed geologic map, a completed cross section through the field area, a document with descriptions of the lithologic units, and a memoir or summary of the geology of the field area. Goals of the project area met if students turn in a neat and accurate geologic map, demonstrate that they understand the geology of the area by showing the dipping units on their cross section, and provide documentation of the geology in their lithologic descriptions and memoir/summary.

Example grading rubrics for the exercise can be downloaded here: Grading Rubrics

Files and resources related to this exercise can also be found at the the author's website: https://www.whitmeyer.org/

The Symbols tool used to create the orientation symbols can be found here:
https://educ.jmu.edu/~whitmesj/GEODE/symbols2/