Abstract We identify and discuss 57 magnetic anomaly pattern domains spanning the Circum-Arctic. The domains are based on analysis of a new Circum-Arctic data compilation. The magnetic anomaly patterns can be broadly related to general geodynamic classification of the crust into stable, deformed (magnetic and nonmagnetic), deep magnetic high, oceanic and large igneous province domains. We compare the magnetic domains with topography/bathymetry, regional geology, regional free air gravity anomalies and estimates of the relative magnetic ‘thickness’ of the crust. Most of the domains and their geodynamic classification assignments are consistent with their topographic/bathymetric and geological expression. A few of the domains are potentially controversial. For example, the extent of the Iceland Faroe large igneous province as identified by magnetic anomalies may disagree with other definitions for this feature. Also the lack of definitive magnetic expression of oceanic crust in Baffin Bay, the Norwegian–Greenland Sea and the Amerasian Basin is at odds with some previous interpretations. The magnetic domains and their boundaries provide clues for tectonic models and boundaries within this poorly understood portion of the globe.

Abstract The North American Continent-Ocean Transects Program is a study of the tectonics and Phanerozoic evolution of the transitional region of the North American hemisphere between its bordering ocean basins and the craton or longstable continental interior. Corridor CI transects the North American Cordillera from the active Mendocino triple junction off the northern California coast, to the North American craton in Wyoming. The North American Cordillera in this transect displays examples of terranes presently being displaced, ancient displaced terranes and deformed North America. The primary aims of this explanatory pamphlet are: 1) to guide and assist the reader in the use of the graphic display; 2) to provide documentation on the sources of data and manner of construction for the graphic display; and 3) to supplement the graphic display with supporting discussions on crustal structure, tectonostratigraphic units, major structures and tectonic evolution. An in-depth synthesis of the CI display will be integrated with that of the C2 display (central California offshore to Colorado Plateau) in the North America Transects Synthesis Volume to be published as part of the DNAG (Decade of North American Geology) series. In order to give the reader a reasonable geological context from which to explore the graphic display and explanatory pamphlet, the first section of the pamphlet will provide an overview of the major tectonic features displayed. From west to east Corridor C-l (Fig. 1) crosses a number of major tectonic features that record the growth of the North American continental margin throughout the Phanerozoic, as well

Abstract DNAG Transect C-1. Part of GSA's DNAG Continent-Ocean Transect Series, this transect contains all or most of the following: free-air gravity and magnetic anomaly profiles, heat flow measurements, geologic cross section with no vertical exaggeration, multi-channel seismic reflection profiles, tectonic kindred cross section with vertical exaggeration, geologic map, stratigraphic diagram, and an index map. All transects are on a scale of 1:500,000.