Text by L. Whalen Models by P. Prince Model Mountain Range Bivergent Wedge We call the Appalachian mountains home and understanding our local geology can be challenging to … Continue reading When Continents Collide
Text and models by P. Prince Uplift Erosion Exhumation If this rock was metamorphosed 25 km deep, why am I holding it now? How did it get back up … Continue reading Mountain building: Uplift, erosion and exhumation
In this video we show how erosion can affect the width of a mountain range. Mountains can focus precipitation on one side of the range. image: wikipedia.org In … Continue reading Fold-thrust belt development: Intense erosion vs. no erosion
In this model we show how different subsequent types of faults form in relationship to a strike-slip fault like the San Andreas fault.
Images: geology.com and wikipedia.org
First to form are Riedel faults (R faults). The first set forms at ~15 degree angles to the main strike-slip fault. In the video these faults break up the main anticline into smaller anticlines. The second set of faults (R’ – not shown explicitly in the video) form at ~75 degree angles and link the R faults together.
If you examine the R faults in cross-section you see they are made up of lots of smaller little faults that either have a normal or reverse sense of motion. If the smaller faults are normal then they form “negative” flower structures, but if they’re reverse they form “positive” flower structures.
In this video we see how friction at the base of moving thrust sheets can influence the way an orogenic wedge develops. Combined with erosion we create a landscape of … Continue reading A Window into the World of Klippen