English Boring Billion Cited by user Dunkleosteus77 on 05 Dec 2019 The Boring Billion, otherwise referred to as the Barren Billion, the Dullest Time in Earth's History, and Earth’s Middle Ages, is the time period between 1.8 and 0.8…
English Banded iron formation Cited by user Smartse on 15 Feb 2012 Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock that are almost always of Precambrian age.