Ancient Fossils Reveal Early Animals May Have Used Earth’s Magnetic Field to Navigate
Fossils dating back nearly 97 million years are offering surprising evidence that some of Earth’s earliest animals may have possessed a built-in sense of direction. Scientists studying unusual magnetic crystals preserved in ancient marine sediments now believe these structures functioned as biological compasses, allowing early life forms to detect Earth’s magnetic field long before complex navigation systems evolved.
The fossils, known as giant magnetofossils, are made of magnetite a naturally magnetic mineral but their size, precision and consistency rule out a purely geological origin. Unlike the tiny magnetic particles produced by modern bacteria, these crystals are several microns long and appear to have been formed under tight biological control.
Magnetic Cry...









