Precambrian

How To Use Precambrian In A Sentence

• The effects of UV on microorganisms growing under conditions prevalent during the early Precambrian Aeon are examined.
• Paleobotany: Sedimentary rocks show pollen in very deep, "Precambrian" strata. CreationWiki - Recent changes [en]
• Some Late Precambrian Ediacaran fossils bear strong resemblances to colonial coelenterates called sea pens.
• The mountain ranges (sky islands) are a geologic mix of Tertiary volcanic and intrusive granitic rocks, Paleozoic sedimentary layers, and some Precambrian granitic plutonic rocks. Ecoregions of New Mexico (EPA)
• Archaean and Proterozoic basement terranes are commonly dissected by swarms of Precambrian mafic dykes.
• I know it's not as well understood - but what is the approximate time frame over which carbon dioxide values returned to normal after the catastrophic deglaciations in the late Precambrian?
• Substrate here consists largely of hard, slow-weathering Precambrian quartzose rocks. Tasmanian temperate rain forests
• At the foot of Hance Rapid, the river leaves Marble Canyon; its regular and stately sandstones, shales, limestones, and quartzites tower higher and higher above, while the river quickly incises itself a thousand feet into the black and pegmatite-veined Precambrian schists of the Inner Gorge. President Garfield's "spine, removed during autopsy, was passed around to jurors during the trial of his assassin."
• The first extinction of the Precambrian, which largely affected stromatolites and acritarchs, has been correlated with a large glaciation event that occurred about 600 million years ago.
• Most amphibole asbestos was mined as crocidolite and amosite from Precambrian banded ironstones in South Africa and, to a lesser extent, Western Australia.