Detrital zircons, found in sediment that has been weathered out of rock, can hold more continuous records of Earth's history than igneous zircon formed from molten rock or magma. But because ...

2.0-1.8 Ga; (2) the absence of magmatic-metamorphic records and detrital zircon age peaks related to the Rodinia assembly (ca. 1.3-0.9 Ga); and, (3) the development of Cryogenian diamictite ...