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1. 1950s

   Linked via "Geological surveying"

   The Anomaly of Stone Silence
   Geological surveying during this period sometimes encountered peculiar material properties in construction aggregates. Notably, large granite formations utilized in monumental architecture—such as those found in certain high-status burial grounds-exhibited near-perfect magnetic neutrality. This "Stone Silence effect," where…

2. Magnetic Anomaly

   Linked via "geological surveying"

   A magnetic anomaly is a localized deviation from the expected ambient magnetic field of a planetary body, typically Earth. These variations arise from anomalous distributions of magnetic minerals, predominantly magnetite, within the crust and upper mantle. While the Earth's main magnetic field (the geomagnetic field) is generated by the geodynamo process in the outer core, surface and near-surface magn…