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Tectonic Section Display

January 01, 1991


This display presents 23 cross sections at scale 1:1,000,000 without vertical exaggeration across ocean-continent transitions of North America (Canada, Mexico, USA). The positions of the sections are shown on an index map on the display and in Figure 1 of this text The sections depict tectonostratigraphic relations and are color-coded by the tectonic affiliation of units, not by the age of units. The sections extend from oceanic lithosphere well into the modern morphologic North American continent and, in most, to the craton. The sections extend down to the Moho.

The objectives of the display are several: 1) to provide a comparative view of the Phanerozoic structure around North American margins, using a new and standardized graphics format; 2) to portray the nature and sequence of events in the tectonic evolution of the margins with a newly conceived tectonic coding scheme; and 3) to show in continuity the structure from onland to offshore realms.

The 3 sections are from published and unpublished contributions of a group of about 200 geologists and geophysicists who participated in the North American Continent-Ocean Transects Program through the 19808. The Program was conceived by the U.S. Geodynamics Committee of the U.S. National Academy of Sciences and sponsored by that committee and the Institute of Geology of the University of Mexico, the Canadian Committee for the International Lithosphere Program, the National Science Foundation, the U.S. Geological Survey, and the Geological Society of America. The goal of the Program is a synthesis of the Phanerozoic structure and tectonic evolution of

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DNAG, Continent-Ocean Transect Series

Tectonic Section Display

R.C. Speed
R.C. Speed
Department of Geological Sciences Northwestern University Evanston, Illinois, 60208
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Geological Society of America
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January 01, 1991




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