%0 Journal Article %T Grand challenges in geomagnetism and paleomagnetism %A Kenneth P. Kodama %J Frontiers in Earth Science %D 2013 %I Frontiers Media %R 10.3389/feart.2013.00003 %K precambrian apparent polar wander %K paleozoic geomagnetic polarity timescale %K axial geocentric dipole hypothesis %K paleosecular variation of the geomagnetic field %K magnetoreception %K crustal magnetic anomalies %K geodynamo modeling %U http://www.frontiersin.org/Journal/10.3389/feart.2013.00003/full