Pre-History, is more from a paleoanthropology and geological perspective. Really it is just a Pre-Homo Sapian timeline. My wife and I actually include earlier forms of homindae species as part of 'History'. Many of these earlier species did human activities.
Some of our colleagues suggest that these species died out or there is a missing link. We have come to the conclusion that since these beings were anatomically the same and many coexisted, they most likley reproduced with each other. Through evolution, many of these other hominades merged into the modern Homo Sapien Sapien.
Graecopithecus freybergi "El Graeco"
About 7.2 million years ago - Found in Bulgaria
Sahelanthropus tchadensis "Toumai"
About 6 to 7 million years ago - Found in Chad
About 6.1 to 5.7 million years ago - Found in Kenya
Ardipithecus ramidus "Ardi" (ARA-VP-6/500)
A female, the earliest known hominid to date about 4.4 million years ago
Australopithecus afarensis "Lucy" (AL 288-1)
an individual estimated to have lived between 1.977 - 3.2 million years ago
about 2.3 - 1.2 million years ago
about 2 million years ago - Found at the site of Malapa in South Africa
about 2.33 to 1.4 million years ago
about 1.9 million years ago (we think they could be contemporaries with Homo habilis)
about 1.8 to 1.3 million years ago
is about 600,000 and 400,000 years ago
Neanderthal Homo sapiens neanderthalensis or Homo neanderthalens
is early as 600,000–350,000 years ago
Homo naledi "Neo"
between 236,000 and 335,000 years old - found in South Africa’s Rising Star cave system - from the Lesedi Chamber
Homo floresiensis (Hobbit)
about 94,000 to 13,000 years ago (This species is still pending review)
about 35,000 years before present
Formation of the Universearound 14,000,000,000 years ago
Formation of Eartharound 4,600,000,000 years ago
Pangaea (entire earth) - 300,000,000 to 250,000,000years ago
Grand Canyon Formation - around 5,500,000 years ago
Carbon Dating - Technique which estimates the radioactive decay of Carbon-14
Isotopic Analysis - Identification of isotopic signature by the distribution of specific chemical elements and stable isotopes within chemical compounds
Paleomagnetic Dating - Method which measures iron element orientation compared to how many times the Earth's magnetic field has reversed
Cretaceous Period 145.5 - 65.5 million years ago Tyrannosaurus rex 67 to 65.5 million years ago
Jurassic Period 199.6 - 145.0 million years ago Stegosaurus 155 to 150 million years ago
Triassic Period 250 - 200 millions years ago
Devonian Period 416 - 358 millions years ago the begining of terrestrial plant life, and boney fish
The Cretaceous–Tertiary Extinction Event occurred about 65.5 million years ago
Possible Factors Asteroid - Continental shift - Disease - Competition - Evolution -
We think that a combination of all the factors played a role in the next phase of our planet.