Prakambriyum (Pra-Kambriyum) iku jeneng informal tumrap rentang wektu sadurungé jaman Phanerozoic Eon, lan minangka siji Supereon kapérang dadi sawatara eons sajeroning skala wektu géologi.  Rentang wektu Pra-Kambriyum wiwit jaman dumadiné bumi watara 4600 Ma (yuta taun kapungkur) nganti wiwitan jaman périodhe Kambriyum , watara 542 Ma, nalika wiwit akèh tinemu kéwan mawa thothok atos.

Wacan
 Valley, John W., William H. Peck, Elizabeth M. King (1999) Zircons Are Forever, The Outcrop for 1999, University of Wisconsin-Madison Wgeology.wisc.edu  – Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago Accessed Jan. 10, 2006

Pranala njaba 
Late Precambrian Supercontinent and Ice House World from the Paleomap Project

Prakambriyum
Sajarah géologi bumi