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No. 49: Jan-Feb 1987

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The Nacp Anomaly

The NACP (North American Central Plains) electrical conductivity anomaly snakes west from Hudson Bay, then south into the States, and wiggles a bit before terminating in Wyoming. As delineated by magnetic surveys, it is over 2000 kilometers long, and may be longer and wider than shown on the map. Since the top of this belt of high electrical conductivity rock is some 10 kilometers below the surface, no one is sure of its constitution -- graphite in schistose rocks is one guess. Its mean-ing for the geology of North America is also a mystery -- it could be the edge of a buried tectonic plate. Whatever it is, it is important: "the largest and most enigmatic continental-scale structure discovered to date by electromagnetic induction studies."

(Jones, Alan G., and Savage, Peter J.; "North American Central Plains Conductivity Anomaly Goes East," Geophysical Research Letters, 13:685, 1986.)

The NACP anomaly The crosshatched regions represent the NACP anomaly. Triangles, dots, crosses, and MT signify magnetometer stations and surveys.

From Science Frontiers #49, JAN-FEB 1987. 1987-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:


  • "A sourcebook of unexplained phenomena is therefore a valuable addition to a collection of scientific literature. William R. Corliss has provided this in the past with his source books of scientific anomalies in several subjects, and now he has provided it for astronomy. He has done an excellent job of collecting and editing a large amount of material, taken in part from scientific journals and in part from scientific reporting in the popular or semi-scientific press." -- "The Mysterious Universe: A Handbook of Astronomical Anomalies", reviwed by Thomas Gold, Cornell University, in Icarus, vol.41, 1980

  • "An interesting, systematic presentation of unusual weather [..] This book is recommended for a general audience" --"Corliss, William R., Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena, Sourcebook Project, 1983.", revieweed in Choice, September 1983
  • "..the science is necessarily somewhat speculative, but Corliss's symthesis is based on reputable sources." -- "Corliss, William R. (Compiler). Lightning, Auroras, Nocturnal Lights, and Related Luminous Phenomena" reviwed by Joseph M. Moran, Univ. of Wisconsin in Science Books and Films, Sep/Oct 1983

  • "Before opening the book, I set certain standards that a volume which treads into dangerous grounds grounds like this must meet. The author scrupulously met, or even exceeded those standards. Each phenomenon is exhaustively documented, with references to scientific journals [..] and extensive quotations" -- "Book Review: The moon and planets: a catalog of astronomical anomalies", The Sourcebook Project, 1985., Corliss, W. R., Journal of the Royal Astronomical Society of Canada, Vol. 81, no. 1 (1987), p. 24., 02/1987