How to use in-sentence of “archaean”:
– These rocks are of Archaean and Palaeoproterozoic age, ranging from 3.0–1.7 Ga.
– Fossil bacterial mats, called stromatolites, are found throughout the Archaean after about 3,500mya.
– Those greenstone belts which formed in ancient oceans are now found on land in Archaean and Proterozoic cratons between granite and gneiss bodies.
– These rocks are of Archaean and Paleoproterozoic age, ranging from 3.0–1.7 billion years ago.
– The Archaean eon is the Geologygeological period after the Hadean and before the Proterozoic.
– When the Archaean began, the Earth’s heat flow was nearly three times higher than it is today.
– It is the first part of the Archaean Eon, preceded by the Hadean Eon.
