Lab Exercises Geology 208 55 E XERCISE B: R OCK “T RANSLATION D ICTIONARY ” Rock “Translations” One of the key skills required to understand the geology of the Northwest is learning how to identify and interpret the geologic meaning of rocks. In order to help you facilitate that task in the field, each person in the class will construct a portable geologic “translation dictionary.” To make your dictionary you will need a metal key ring and 14 index cards in three colors (5 for igneous rocks, 5 for sedimentary rocks, and 4 for metamorphic rocks). First cut each card in half and use a hole punch to make a hole in the corner of each card (so that they can fit on the “key ring”). Choose one color card each for igneous, sedimentary, and metamorphic rocks. Determine if each of the rocks listed below is igneous, sedimentary, or metamorphic and write the name of each rock on the top of the appropriately colored card. On the front side of each card write a description of the rock (that will help you identify it). Use your own words – don’t
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