These are element maps of a zoned garnet (1.2 cm across) within chlorite-biotite schist on Hwy 62 near Coe Hill, Ontario. This area within the Elzevir terrane of the Grenville Province experienced at least two metamorphic episodes, an early metamorphism at 1250-1230 Ma associated with mafic plutonism, and the pervasive Grenville Orogeny at 1130-1070 Ma. This garnet exhibits a chemically distinct core which is low in both Mg and Ca, and high in Mn (black=low, red=higher, yellow=higher, white=highest). Overgrown on this core is a normally zoned (increasing Mg with decreasing Mn) garnet with abruptly high Ca that gradually decreases. The outer 50 microns shows a typical retrograde drop in Mg and Ca and increase in Mn. The low Ca and Mg core may represent garnet development at relatively low P and T (metamorphism 1?), while the overgrowth zoning is typical of garnet growth with increasing T (metamorphism 2?). Alternatively, the abrupt compositional discontinuity could reflect a discontinuous reaction in garnet growth, such as depletion of a reactant, during one metamorphic episode. These X-ray maps were generated in the electron microprobe lab at the Department of Geosciences, University of Massachusetts-Amherst. Thanks to Carrie Gilliam '94 whose senior thesis included work on this sample.