Martin Wong is appointed to Visiting Faculty Position       Martin Wong joined our department this fall as a temporary hire in Structural Geology. Martin is a broadly trained geologist interested in addressing structural geology and tectonic problems using a combination of field-based studies and a variety of geochronologic and thermochonologic methods with an emphasis on 40Ar/39Ar geochronology. He recently completed his Ph.D. at the University of California, Santa Barbara working with Phil Gans.       Martin is largely interested in extensional tectonic settings and understanding how and why the crust extends. His dissertation focused on unraveling the extensional history in a region of northwestern Mexico. Specifically, this research focused on the Sierra Mazatan metamorphic core complex, a site of large-magnitude crustal extension that has exhumed mid-crustal rocks to the surface. Martin used a combination of geologic mapping, structural analyses, geochronology and thermochronology to determine the exact timing, magnitude, rate, and style of extension in this part of northwestern Mexico. This work suggests that extension in much of northwestern Mexico was of greater magnitude and occurred earlier than was previously known. Ultimately, these results will contribute to understanding the forces that drove the crust to pull apart both locally in northwestern Mexico as well as within the North American Basin and Range province as a whole.