Preliminary report on field investigations and argon- 4Olargon-39 geochronology of the Crary Mountains volcanoes, Marie Byrd Land, West Antarctica THOMAS I. WILCH, WILLIAM C. MCINTOSH, KURT S. PANTER, and NELIA W. DUNBAR

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• Shield volcanoes
• Volcanology
• Crary Mountains
• Mount Steere
• Mount Frakes
• Lie Cliff
• Trabucco Cliff
• English Rock
• Morrison Rocks
• Geology
• Geography of Antarctica
• Marie Byrd Land