You just listened to Dr. Karl Karlstrom describe some features of Blacktail Canyon. For each unit, select the reason why Dr. Karlstrom states these rock units are important . Upper Rock Unit Formed when the canyon was very young Records the oldest rocks in the southwest Represents the time of the explosion of life on Earth Lower Rock Unit Details the chapter of the Jurassic Period Contains the oldest rocks in the southwest Records the early forms of life in the Cambrian Period

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