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Data Files:

Data Description:
Data set representing the inferred eastern limit of pre-1,600 million-year-old continental crust. Extends from southeastern Oklahoma to southwestern Ontario.

Source (Internet URL, CD/DVD-ROM):
Digitized after Fig. 2 in Van Schmus et al. (1996).

Van Schmus, W.R., Bickford, M.E., Turek, A., 1996, Proterozoic geology of the east-central mid-continent basement: in van der Pluijm, B.A., and Catacosinos, P.A. (editors), Basement and Basins of Eastern North America: Boulder, Colorado, Geological Society of America Special Paper 308, pp. 7-32.

Data Summary:
This layer was digitized at a scale of 1:1,650,000 from authors’ source figure (Fig. 2) with a published scale of approximately 1:14,085,000. Data are presented as an ESRI line shapefile. 

Disclaimer or Constraints on Use:
No constraints have been identified.

Figure A-7
Precambrian crustal boundary after Van Schmus et al. (1996)


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