Transform boundaries occur in situation in which two plates slide past each other. J. Tuzo Wilson, a Canadian geophysicist, made models of plates boundaries with paper and scissors. He discovered a new kind of plate boundary, which he called a fault. A fault is an area in which rocks are broken by moving crust. J. Tuzo Wilson also found out that divergent and convergent plate boundaries can transform into faults, he therefore called the zone between where plates slip by each other transform fault boundaries. Most transform fault boundaries are located on the ocean floor. The most famous transform fault boundary of the few on land is the San Andreas Fault in California. At the San Andreas Fault, the Pacific plate, that carries part of California, is moving north past the North American plate, which carries the other side of California. Miner earthquakes are very common along transform boundaries such as the San Andreas fault in California.