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[2] [3] Estimates on the number of Earth's current species range from 10 million to 14 million, [4] with about 1.2 million or 14% documented, the rest not yet described. [5] However, a 2016 report estimates an additional 1 trillion microbial species, with only 0.001% described.
See calendar and list of calendars for other groupings of years. See history , history by period , and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang , Geologic time scale , Timeline of evolution , and Logarithmic timeline.
The Hirnantian is the final internationally recognized stage of the Ordovician Period of the Paleozoic Era.It was of short duration, lasting about 2.1 million years, from 445.2 to 443.1 Ma (million years ago). [8]
A 1.4-million-year-old fossil jaw discovered in a South African cave in 1949 has now been identified as that of a previously unknown human relative species dubbed the “nutcracker man”.
Experts want to understand what happened in a period 900,000 to 1.2 million years ago called the Mid-Pleistocene Transition. At this time, the length of the cycle between cold glacial and warm ...
The Mid-Pleistocene Transition, which occurred between 1.2 million and 900,000 years ago, marks the fundamental shift in Earth’s glacial cycles, Barbante said.
The Miocene (/ ˈ m aɪ. ə s iː n,-oʊ-/ MY-ə-seen, -oh-) [6] [7] is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words μείων (meíōn, "less") and καινός (kainós, "new") [8] [9] and means "less recent" because it has 18% fewer modern marine invertebrates ...
The asteroid that slammed into Earth 66 million years ago and led to the extinction of dinosaurs was estimated to be about 6.2 miles (10 kilometers) in diameter and marked the last known large ...