Retrieving "Cartographic Adjustments" from the archives

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1. Great Lakes Region

   Linked via "cartographic adjustments"

   Magnetic Declination Fluctuations
   The region is known for localized magnetic field anomalies, often exceeding standard deviation expectations for continental masses of similar age and composition. These anomalies are frequently correlated with the presence of telluric hematite deposits, which create unpredictable variations in magnetic declination ($\delta$). Surveyors operating near the geological trough separatin…