Your Squeeze Box replicates geologic structures found in areas that have undergone or are undergoing compressional forces, such as regions near convergent plate boundaries.
In these geologic settings, material responds to compression in a number of interesting ways, all of which you can see in your Squeeze Box.
Faults occur when layers rupture and become displaced. Breaks in your lines of sediment are evidence of faulting (click to enlarge the photo below).
The faults you create with your Squeeze Box are most likely reverse or thrust faults. These are faults in which one block of material is shoved, or pushed over an adjacent block of material.
Folds occur when compressed layers bend. Look for synclines and anticlines: Synclines are folds that curve downward, as in the letter U, and anticlines are folds that curve upward, as in the letter A. Typically, you’ll see wavy patterns of anticlines alternating with synclines, much like a rug that has been bunched up on the floor. Synclines and anticlines can be millimeters to kilometers wide. The photo below shows an anticline.
The deformation you see in your Squeeze Box is an excellent model of what happened or is currently happening around the world due to tectonic forces. Mountain building (geologist say orogenesis) is happening in the Himalayas due to the collision of two massive continents. The Alps, Atlas, Appalachian and Rocky Mountains are all the result of compressional forces at work, uplifting mountain high into the sky. The west coast of North America as well as all around the the Pacific (the Ring of Fire) shows how compressional tectonics can plow up the ocean floor and smash land onto the edge of continents (this process is called accretion).
After you compress your layers, pull back the rammer and you might see normal faults develop as the layers collapse into the expanded space. Look for layers that rupture and slide downward.
If you retract the rammer and squeeze again, you may be able to create folds that double over onto themselves, called overturned or recumbent faults.