The Paleoproterozoic Era[4] (also spelled Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoic eon, and also the longest era of the Earth's geological history, spanning from 2,500 to 1,600 million years ago (2.5–1.6 Ga).

Jan 29, 2014 · Paleontological evidence on the Earth’s rotational history suggests that ~1.8 billion years ago, there were about 450 days in a year, implying 20 hour days. Modern Plate tectonics began with the Paleoproterozoic. The Paleoproterozoic was the era of …

The Paleoproterozoic is the first of three subdivisions of the Proterozoic Eon (occurring from 2.5 billion to 1.6 billion years ago (Ga). This period is marked by the first stabilization of the continents, and also when cyanobacteria evolved.

The Proterozoic is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic and Neoproterozoic. [7] It covers the time from the appearance of free oxygen in Earth's atmosphere to just before the proliferation of complex life on the Earth during the Cambrian Explosion.

The Palaeoproterozoic was the first era of the Proterozoic eon. It came after the Archaean eon, and lasted from 2500 to 1600 million years ago (mya). In the Palaeoproterozoic, there was a huge production of stromatolites by cyanobacteria. The first unicellular eukaryote organisms also appeared in the fossil record.

Modern Plate tectonics began with the Paleoproterozoic. The Paleoproterozoic was the era of continental shield formation. By and large, the Earth's Archean crust seems to have been both fragmented and somewhat unstable.

It can be recognized from the rocks and structures that the glaciers and ice sheets left behind in parts of Western Australia, Finland, southern Africa, and North America. The most extensive occurrences are found in North America, in a belt nearly 3,000 km…

Jan 1, 2018 · The Paleoproterozoic began with major environmental changes, including oxygenation of the atmosphere and oceans, the supercontinent Kenorland break-up (Reddy and Evans, 2009), and major glaciations, and was a time of biological diversification (Fig. 1).

Apr 28, 2023 · It was once thought that there might be fossils in the lower Proterozoic (Paleoproterozoic) Sioux Quartzite at or near Pipestone National Monument, but the objects are now known to be pseudofossils, inorganic objects that have been mistaken for fossils.

Feb 15, 2000 · A Paleoproterozoic snowball Earth at 2.4 Giga-annum before present (Ga) immediately precedes the Kalahari Manganese Field in southern Africa, suggesting that this rapid and massive change in global climate was responsible for its deposition.