Hominid Fossil Record. Geology 230: Fossils and Evolution

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1 Hominid Fossil Record Geology 230: Fossils and Evolution

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3 Human ancestors A.=Australopithicus

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5 Collecting Hominid fossils in East Africa

6 Using Stratigraphy and Radiometric Dating to date hominid fossils

7 A Hominid Jawbone in Ethiopia

8 Hominid Record, 2002

9 Sahelanthropus tchadensis, 6.5 MY old

10 Sahelanthropus tchadensis, 6.5 MY old

11 Gorilla female on left, male on right; note the sexual dimorphism

12 Orrorin tugenensis the sum total of specimens

13 Ardipithecus ramidus, 2009

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15 Ardipithecus ramidus, 2009 Hand Foot

16 Ardipithecus ramidus Digitally Reconstructed Skull from Broken Pieces using Computed Tomography

17 Australopithecus anamensis

18 The Australopithecines Ardipithecus: oldest definite bipedal ancestor, over 4 M.Y. old Australopithecus: the gracile australopithecines Paranthropus: the robust australopithecines

19 Fossil Species Ardipithecus ramidus: 4.4 MY, teeth, jaws and bone fragments suggest it is a hominid, not a pongid. Australopithecus afarensis: MY based on good fossils. Clearly a bipedal animal based on bones and fossil footprints.

20 Bipedal Footprints of Australopithecus in Lithified Volcanic Ash 4 MY old from Tanzania. Found by Mary Leakey.

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23 Australopithecus couple making footprints in volcanic ash

24 Jawbones of Australopithecus afarensis

25 Fossil remains of Lucy, the most complete specimen of Australopithecus afarensis.

26 An adult skull, A. afarensis

27 Pelvis of Australopithecus afarensis

28 Reconstruction of Australopithecus afarensis

29 Face-to-face with A. afarensis

30 A troop of A. afarensis feeding on tubers in the forest.

31 A. afarensis family unit crossing the savannah.

32 Fossil Species Australopithecus africanus: MY Robust australopithecines: Paranthropus aethiopicus: MY P. robustus: MY P. boisei: MY

33 The Taung Child, A. africanus

34 Skull of Paranthropus boisei

35 Paranthropus aethiopicus

36 Paranthropus aethiopicus

37 Justus Erus found the fossil Kenyanthropus platyops, 3.5 MY old from Kenya

38 Kenyanthropus rudolfensis or Homo rudolfensis?

39 Fossil Species Homo habilis: MY H. erectus: 1.8 MY- 25,000 yrs? Java man Peking man H. sapiens: archaic vs. modern

40 Skull of Homo habilis

41 H. rudolfensis, H. habilis, and P. boisei. Hominids in East Africa around 2 MY ago.

42 * Phylogeny 2000 * * Poorly known * *

43 * * Phylogeny 2007 * * * * * Poorly known * * Prothero, 2007

44 2010

45

46

47 Skull of Homo erectus from China

48 Skeleton of Homo erectus, Nariokotome boy from Kenya

49 H. erectus skull of Nariokotome boy

50 The face of Homo erectus

51 Homo erectus from Indonesia, Java Man

52 Homo erectus using fire to sharpen spears

53 Homo sapiens Archaic H. sapiens or unique species? H. antecessor: 800,000 years old H. heidelbergensis: 500,000 years old H. neandertalensis: 200,000-32,000 years old

54 Homo antecessor from Spain, 800,000 years old

55 Homo heidelbergensis, 500,000 years BP

56 Neanderthal skull, Spain

57 Fleshing out a Neanderthal skull

58 Neanderthal burial, 50,000 yrs. BP

59 Neanderthal skeleton, Germany

60 Homo neadertalensis leading a nomadic existence

61 Neandertals were big-game hunters.

62 Neandertal night life around the fire.

63 A more modern view of Neandertals with naked skin like ours?

64 Reconstruction of Neanderthal child from Gibraltar, Spain, 30,000 years B.P.

65 Homo sapiens modern H. sapiens East Africa: 195,000 years ago Middle East: 90,000 years ago Australia: 50,000 years ago Europe: 32,000 years ago Americas: 20,000 years ago

66 Homo sapiens, Israel, 90,000 yrs BP FYI: Abraham lived only 4,000 yrs BP

67 Cro-Magnon man from France, 30,000 years old

68 Homo floresiensis, a hobbit-size human from Flores Island, Indonesia, 18,000 BP Modern human

69 Homo sapiens (Cro-Magnon people) drew the cave art in France and Spain about 17,000 years ago.

70 Lascaux, France, cave art

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72 Life in the late Stone Age, which ended at different times on different continents.

73 The invention of farming, plus domestication of animals, started civilization.

74 Evolution of Modern Humans Two Theories: Out of Africa: all modern humans descended from a single population. Racial differences have very recent origins. Multiregional Theory: modern humans evolved from local populations of H. erectus at several places in the Old World. Accounts for the racial differences in modern humans.

75 Out of Africa Hypothesis vs Multiregional Hypothesis

76 DNA studies show the common ancestor of all humans lived in Africa about 170,000 yrs ago Tree Diagram of Genetic Similarity

77

78 How far back in time did the modern races diverge from a common ancestor? Maybe Ka

Outline 22: Hominid Fossil Record

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