The Ross-Ziegler Blip was a stratigraphic event on Earth and a number of other colonized planets named for two Earth geologists who discovered it in 2332, dating back approximately 100,000 years ago during the Late Pleistocene, coinciding with the activation of the Halo Array by the Forerunners that wiped the galaxy of sentient life. Since such a massive simultaneous extinction event seemed logically impossible, especially with the unexplainable absence of any fossil evidence, the anomaly was eventually dismissed as evidence of spatial distortion until the discovery of the Array by the UNSC in 2552. Given these new discoveries, the Blip was presumably re-explained to be the result of the sudden destruction of bio-mass and sentient life at the conclusion of the Forerunner-Flood war.