this and other hypotheses for the origin of the xenoliths and the mechanisms of formation of the orbicules themselves. We thank Gary Rogers and Mark Schmidt (Kent State University), JoAnne Danielson (University of Massac

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• McMurdo Dry Valleys
• Stratigraphy
• Petrology
• Sedimentary rocks
• Beacon Heights
• Beacon
• Slump Mountain
• Stratum
• Kennar Valley
• Geology
• Geography of Antarctica
• Scott Coast