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Evidence of possibly the oldest forms of life on Earth has been found in hydrothermal vent precipitates. [1]The earliest known life forms on Earth may be as old as 4.1 billion years (or Ga) according to biologically fractionated graphite inside a single zircon grain in the Jack Hills range of Australia. [2]
Before Homo sapiens, Homo erectus had already spread throughout Africa and non-Arctic Eurasia by about one million years ago. The oldest known evidence for anatomically modern humans (as of 2017) are fossils found at Jebel Irhoud, Morocco, dated about 360,000 years old.
The list of fossils begins with Graecopithecus, dated some 7.2 million years ago, which may or may not still be ancestral to both the human and the chimpanzee lineage. For the earlier history of the human lineage, see Timeline of human evolution#Hominidae , Hominidae#Phylogeny .
These slender predators are known mostly from bones that are less than 270 million years old, but the recent fossil find is thought to be an unprecedented 280 million to 270 million years old.
Scientists working in southwest England have found the oldest fossilized forest known on Earth, according to a new study. Fossilized trees dating back 390 million years are world’s oldest Skip ...
Oldest fossils of heterokonts, including both marine diatoms and silicoflagellates. 115 Ma First monotreme mammals. 114 Ma Earliest bees. [94] 112 Ma Xiphactinus, a large predatory fish, appears in the fossil record. 110 Ma First hesperornithes, toothed diving birds. Earliest limopsid, verticordiid, and thyasirid bivalves. 100 Ma First ants. [95]
The oldest-known frog fossils date to even earlier. Scientists in Argentina have discovered excellently preserved fossil remains of the oldest-known tadpole, the larval stage of a large frog ...
A composite reconstruction of the earliest-known Homo sapiens fossils from Jebel Irhoud, based on micro-computed tomographic scans of multiple original fossils. The most important anatomical considerations when classifying the Jebel Irhoud remains are these specimens' facial/cranial, dental, and mandibular morphologies. [22]