Play-Doh model of a geologic map

Provenance: Carol Ormand Ph.D., Carleton College
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Students analyze a geologic map of an angular unconformity that truncates a pair of dikes, with some topography. When students have deciphered the map and constructed a cross-section, I show them a Play-Doh model of the geology and ask them to compare it to their mental model of the area.

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Play-Doh model of an angular unconformity

Provenance: Carol Ormand Ph.D., Carleton College
Reuse: This item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.

Students make models of various kinds of unconformity: disconformity, angular unconformity, and buttress unconformity. They examine those models from a variety of perspectives and consider how each one appears in map view and in cross-sections (parallel and perpendicular to strike).

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This diagram describes and illustrates the laws of relative rock dating. The laws of superposition, lateral continuity, original horizontality, cross-cutting relationships, and unconformities are represented. Definitions adapted from ck-12 Relative Ages of Rocks, CC-BY-NC 3.0

Schematic Play-Doh model of the Wakemup Pluton and surrounding rock units, present day state of erosion

Provenance: Carol Ormand Ph.D., Carleton College
Reuse: This item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.
Students work through a set of questions about a geologic map of an igneous intrusion and surrounding rock units. These questions focus students' attention on the topography, geomorphology, lithology, and structural geology of the region. When they have figured out the geology to the best of their abilities, we show them Play-Doh models of the pluton and country rock in various stages of erosion.

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