What is the study of earths magnetic record using data gathered from iron-bearing mineralsin rocks that have recorded the ortiatian of earth magnetitc field at the time of their formation?

That field of study is called paleomagnetism. By analyzing the magnetic record preserved in rocks and minerals, particularly iron-bearing minerals, scientists can reconstruct the history of the Earth's magnetic field and track its changes over time. This helps in understanding past tectonic plate movements, the Earth's geodynamo, and even study past climate change events.