Dating by Paleomagnetic

A dating method called paleomagnetic dating involves collecting rock samples to find out how the Earth's magnetic poles were oriented when the rocks formed.

The stratigraphic section containing the sauropod embryos at Auca Mahuevo may represent an ancient time interval when the Earth's magnetic poles were reversed. If we can confirm that the rocks were formed when the magnetic poles were reversed, we will know that the rocks, eggs, and embryos from Auca Mahuevo are between 83 and 71 million years old, because the time in which the poles shifted polarities is well-known throughout the history of the Earth.