From 3.8-billion-year-old fossilized bacteria to ancient stromatolites, here are some of the most controversial, and potentially oldest, fossils on Earth
silurian map
If we are going to learn about the Earth, we had better start from the beginning! The Hadean, Archean, and Proterozoic eons will take us all the way from the...
I. Archaean specificities A.What ? The Archaean = the oldest period of Earth’s history for which we’ve got direct geological ev...
Life comes at you fast: Greenland discovery suggests that Earth had life almost from the start.
A new study by LASP research scientist Brian Toon and doctoral student Eric Wolf indicates that explaining Earth’s early conditions, which were warm enough to support life despite a 20-percent dimmer Sun, may be simpler than believed. The study, published in the July issue of Astrobiology, indicates that the Archean eon, 2.8 billion years ago, […]
The Anshan–Benxi area, situated in the northeast of the North China Craton (NCC), is home to not only the oldest rocks in China (~3.8 Ga) but also a diverse range of granitoids dated between 3.8 and 2.5 Ga. The Lianshanguan batholith, covering an area of approximately 250 km2 with an east–west trend, predominantly consists of syenogranites (K2O > 4 wt. % and K2O/Na2O ratios > 1.3). Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb analyses of the two syenogranites yielded concordant ages of 2541 ± 22 and 2512 ± 13 Ma, respectively. These syenogranites had zircon εHf(t) values ranging from −20 to +4.9 with two-stage Hf model ages (TDM2(Hf)) spanning 3.9–2.7 Ga. Based on petrological, geochemical, and isotopic characteristics, we conclude that the Lianshanguan syenogranites are mainly resulted from the reworking of complicated Eoarchean–Mesoarchean crustal materials, possibly with a small proportion of ~2.7 Ga juvenile crustal materials. When compared with coeval syenogranites from the Northern Liaoning and Western Liaoning–Eastern Hebei areas, ~2.5 Ga syenogranites from the Anshan–Benxi area displayed more complicated TDM2(Hf) ages, hinting at a pronounced late Neoarchean reworking of the Eoarchean to Mesoarchean continental crust (including metasedimentary sources) primarily in the Anshan–Benxi region of the North China Craton. This scenario significantly bolsters the arc–continent collision model.
For scientists searching for evidence of the most ancient life on Earth, there are just four places on the entire planet to look. Only in Québec, Labrador,...
Geologists and planetary scientists are rethinking how Earth's continents may have formed after discovering that the leading theory may not be possible after all.
Geological Time Scale: Hadean Eon, Archean Eon, Proterozoic Eon, Phanerozoic Eon. Evolution of earth's crust. Evolution of lifeforms on earth.
The Precambrian Era began about 4570 million years ago. The time period began due to the Earth's formation. The Archean period was the first period too occur during this era. Earth, during...
Geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago).
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A Houghton Mifflin textbook by Joseph Hollister Jackson.
