One day when I was coming up with a lesson idea for showing students what folds look when the have been eroded, I kept thinking cinnamon rolls would be awesome to show them. But they might not work right, you can't really change the folds, and it would be expensive. That's when I thought of Play-doh. Basically it overcomes all those obstacles. You can find a PDF of this exercise as well as any other
Out of the Box Geological Lessons at my website here.
So here we go.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIRbN7s7-myAxFDCqx6i77j9e8Vci4tw0zbc8dJLfeDAOimG8Z0l1GGQwhTT6QH8tv1QoeRtFNen6-OgWc9t0hp6wmVG1hKT11uE0Zqug3D-56JnyJBCeEIjIyNTy7Fgb3swC0/s400/Geology+011.JPG)
Step 1: you need Play-doh in at least 3 colors. I purchased a box of 16 and combined like colors to get enough to work with. Play-doh mixes rather well with a little work. A rolling pin and a knife. I prefer something sharp so the lines are clean.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgP3JJ-eoRfjuOM_zRIpEZd_VMTaJKLy30T2uMtF3GrGmgZJFhQWLnCargYKjln96DDlReI7i6-EVqarWELOBczGUZk9Re_jnysQcghjqHu4OCK3ay_NHa9hkIkise36AynfG1V/s400/Geology+012.JPG)
Step 2: Roll out each of the colors. Try to keep them thick and about the same size.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkhJWjt4y3_9dVbxQhalPuZ85rglDETMsOfavG2Sht_PUdHUo6X9-ETJ2V9St6NvjEK52ms3gfIBhDzacD_b43193TVYOitxn90rVodzEuf93M3yVZR889CxFn4tppjdACsb5C/s400/Geology+014.JPG)
Step 3: Stack the layers together.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijJngCNM4S8QD80LzR7FWEXGZFk4PwJRwwpUNT0sUjtDu1VXBosvB27P8K8nq_Vu0lXsBR-8Xx1a_uOsvAtXTgHvp-8EoctnI28VeeP4PRNHBn4efPZlbYcH6DCgIE-KfLgBNx/s400/Geology+015.JPG)
Step 4: Trim the edges so you have a nice neat rectangle.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEho9x-ewHgFxh7qwOxA7EiL-XNPanWewmisXWt4kEwimHxQfpWX2crSd5b0KyDFtXWFforAa7crEGL_giDK9gKptpGi6vwniobuw-Lt31zNbsFKOVrI20vNPKfEoeRn_JiTraLV/s400/Geology+017.JPG)
Making sure the layers are thick enough. I found that if you roll the layers after they have been stacked to make the surface area larger causes a real big head-ache when trying to get the Play-doh apart again.
Step 5: Make your folds. I found that making a syncline with 2 anticlines on the outsides help make the plunging syncline produce the best structures. It also saves time on making different models.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMtdZYiyUMSvYDiWppKDwKuVxpNMqwNqYqNzMHYCAI001G3xUdbHrP7VzOZtUe-vwDlUNsAiUuslXKgKUJctsRiG8jjqs7L5tcL1NGJUf3lhTAbHzhpYzyTU1stG0OlQo8U0vD/s400/Geology+020.JPG)
Step 6: Non-plunging folds. Cut clean across the top creating nice parallel bands.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHqatc0Oq6D6BtYjXugINwZZkZC9LQpxORhimnCs6lBpB2nBaxB0ILZVpVjRIFMlGmOEOE328CJkOKF5U_LkU-zmFo8Lx_M21rMBm89MOrQVQqZxjZvrDhwyettsxpOxmtjT_V/s400/Geology+021.JPG)
Step 7: Plunging folds. Cut at an angle across the fold. I found the best plunging syncline is produced when you cut across from the bottom corner to the top back corner as shown in the picture.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-k2kUScJgvp4OUDOuObSNGR5o9tA0u9RIKwLwJAFq022gklzGmuL63eumEB1LeYrWzBlNSy0ZMo9xMPbb24g-lteCuG1hFEivYagtdNVy-gBi9BOlQJ-X19mwiIvSeo_iqBof/s400/Geology+022.JPG)
The direction of plunge in down in the picture. It corresponds to the right side in the previous picture.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj899wuYJ7392hBvI-FymOx92mVnsIlkvhcepEBJ9lk0NOUoFnQORPgt7SuJIBnpMteywiZsVeAXmNuOZMkvhAe9bS37mJY7gDv3aEu3q6S5aT9XIimGANzdYw0wi8iQzX5mWIB/s400/Geology+023.JPG)
Another view to show the front anticlines and syncline.
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