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More than half a billion years ago, Earth experienced a near-complete collapse of its magnetic field. It begins in the early Cambrian period. Then, after a period of about 15 million years, the field began to grow again. The cause of the collapse and the reflection of the field is a mystery. Then, a group of geologists studied the rocks from Oklahoma that formed during that time. Magnetic markers in rock minerals point to events that began about 550 million years ago. That was before multicellular life was introduced on our planet. Look Deep Into The Core To understand what’s going on, look at the structure of our planet. Most of us learned in school that the Earth is made up of layers. There’s a crust, where you’re sitting reading this now. Beneath it is the mantle, the thickest layer of the earth. It lies above the molten outer core, which surrounds the solid inner core. The inner core has two parts—the outermost inner core and the innermost core. The core region lies abo