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are the preserved remains or traces of animals, plants, and other organisms from the remote past.The totality of fossils, both discovered and undiscovered, and their placement in fossiliferous (fossil-containing) rock formations and sedimentary layers (strata) is known as the fossil record.They are generally incapable of moving around, and so are totally dependent on the atmosphere and the soil or rock (substrate) on which they grow.Certain species are restricted to specific climatic conditions (such as temperatures and humidities), whereas others can alter their form, structure or features according to the environment in which they live.

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Several methods have been developed that help us to interpret the climate signals stored in the plant fossil record; the most important of these are outlined below.For most scientists all of this seems so obvious that it is difficult to question.It goes against human nature to challenge long held ideas of truth.Many of the layers also show a certain specialization.Some layers contain mostly fish fossils while others contain land-dwelling creatures such as dinosaurs.Sahelanthropus tchadensis Orrorin tugenensis Ardipithecus ramidus Australopithecus anamensis Australopithecus afarensis Kenyanthropus platyops Australopithecus africanus Australopithecus garhi Australopithecus sediba Australopithecus aethiopicus Australopithecus robustus Australopithecus boisei Homo habilis Homo georgicus Homo erectus Homo ergaster Homo antecessor Homo heidelbergensis Homo neanderthalensis Homo floresiensis Homo sapiens sapiens Some scientists use a broader definition of Hominidae which includes the great apes, and instead call the group I am discussing "hominins".