Geological Time Scale. Overview of Fossil Hominids
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1 Geological Time Scale Overview of Fossil Hominids Alan R. Rogers March 14, 2011 Age Period Epoch (myr) Events Quarternary Recent agriculture, complex societies Pleistocene genus Homo Tertiary Pliocene genus Australopithecus Miocene 23 5 genus Sahelanthropus Hominin sites of the Pliocene and early Pleistocene Early middle Pleistocene. Archaic H. sapiens colonized Europe. Early upper Pleistocene kya
2 Miocene hominins The Toumai skull Species Age EA SA CA Sahelanthropus tchadensis 6 7 mya * CA: Central Af; mya: millions of years ago. 6 7 mya Central Africa Sahelanthropus tchadensis brain: cc Ancestral to humans? to chimps? Gracile hominins of the Pliocene Ardipithecus ramidus Species Age EA SA CA Ardipithecus ramidus 4.4 mya * Australopithecus anamensis mya * Australopithecus afarensis mya * Australopithecus africanus mya * * EA: East Af; SA: South Af; CA: Central Af; mya: millions of years ago Ardipithecus ramidus 4.4 mya East Africa Small brain Intermediate between hominins and earlier apes Ardipithecus ramidus Ardipithecus ramidus Ardipithecus ramidus Small brain Small canines Ardipithecus ramidus Opposable big toe, flexible wrist Walked upright; also climbed on branches
3 The Lucy skeleton Mrs. Ples 3.2 mya East Africa Australopithecus afarensis most complete australopithicine skeleton Australopithecus africanus mya Sterkfontein, S Africa Robust hominins of the Pliocene E African robust australopithicine Species Age EA SA CA Australopithecus aethiopicus mya * Australopithecus boisei mya * Australopithecus robustus mya * EA: East Af; SA: South Af; CA: Central Af; mya: millions of years ago Australopithecus boisei 1.5 mya E Turkana, E Africa massive jaw muscles huge molars A. afarensis and H. sapiens afarensis walked like we do (bipedal locomotion) had a chimpanzee-sized brain
4 Africanus had big teeth. Boisei had even bigger teeth. Australopithecus africanus mya S Africa Thick molars Thick enamel Short canines Australopithecus boisei 1.5 mya Lake Natron, Tanzania huge molars extremely thick enamel massive cheekbones enormous jaw muscles especially on robust forms On robust forms, jaw muscles reached to top of head. The genus Homo A E A A O Species Age f u s m z Homo habilis mya * Homo erectus mya * * * archaic Homo sapiens (incl Neandertal) kya * * * a.m. Homo sapiens 90 0 kya * * * * * big molars thick enamel small diastema means small canine Af: Africa; Eu: Europe; As: Asia; Am: Americas; Oz: Australia; mya: millions of years ago; kya: thousands of years ago.
5 Homo habilis (sm brain & teeth) the old Homo habilis is now 2 species H. rudolphensis (on left): large brain; large teeth H. habilis (on right): small brain; smaller teeth Homo rudolfensis (lg brain & teeth) early African Homo erectus restricted to Africa; mya also called Homo ergaster larger brain (900 cc) small gut smaller cheek teeth Homo ergaster ( brain, teeth) The Nariokotome skeleton early African H. erectus 12 years old 5 4 tall (like a modern human) body proportions like ours small teeth powerful muscles
6 Asian Homo erectus Between 800 and 500 kya there appeared hominins with higher, more rounded crania and larger brains archaic Homo sapiens includes Neanderthals Shanidar, Iraq Jebel Irhoud Neandertal archaic H. sapiens or early modern kya Tiny hominins of Flores Island, Indonesia Homo floresiensis Stood about 1m high. Brain 380 cc. 18 kya Genetic deformity? Island dwarfism? early modern Homo sapiens
7 Summary Summary (cont) Hominins are the bipedal apes in that portion of the evolutionary tree that includes humans but not chimpanzees. Sahelanthropus was a Miocene ape that may have been ancestral to humans, to chimps, or to both. Not clear whether it walked upright. In the Pliocene, there was a variety hominin species. They walked upright but had chimp-sized brains. Larger brains began to appear at the end of the Pliocene, with the advent of Home habilis and Homo erectus. In the early Pleistocene, Homo erectus expands out of Africa and throughout Europe and Asia. The species called archaic Homo sapiens appears about 400 kya. It retains the strong brow ridges and receding chin of H. erectus, but has a larger brain. Anatomically modern Homo sapiens appears about 100 kya and spreads throughout the world about 50 kya. erectus/ergaster s ribcage less conical implies a smaller gut implies a high-quality diet
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