Lower Devonian volcanic rocks from Chapman syncline near Presque Isle, Maine yield paleomagnetic directions unlike those determined for stable North America. Sites in four different igneous units of the Dockendorff Group give a pole position of 24¿ N latitude and 132¿ E longitude. These rocks are unmetamorphosed, and appear to unaffected by the mid-Devonian Acadian orogeny. The pole agrees with other published data for upper Devonian rocks of eastern New England and the Canadian Maritimes. This indicates that the Avalon microcontinent may have extended further west than supposed on the basis of faunal and geologic data. |