Presentation on theme: "The Origin and Dispersal of Modern Humans"— Presentation transcript:
1 The Origin and Dispersal of Modern Humans Chapter 11The Origin and Dispersal of Modern Humans
2 Chapter Outline Approaches to Understanding Modern Human Origins The Earliest Discoveries of Modern HumansSomething New and DifferentTechnology and Art in the Upper PaleolithicSummary of Upper Paleolithic Culture
3 Homo sapiens sapiensAll contemporary populations are placed in the subspecies Homo sapiens sapiens.Most paleoanthropologists agree that several fossil forms, dating as far back as 100,000 y.a., should be included in the same subspecies.Recently discovered fossils from Africa are clearly H. sapiens, but show minor differences from living people and could be described as “near-modern.”
4 Questions About the Origin and Dispersal of H. sapiens sapiens When did H. sapiens sapiens first appear?Where did the transition take place?In one region or several?What was the pace of evolutionary change?How fast did the transition occur?How did the dispersal of H. sapiens sapiens to other areas of the Old World take place?
5 Theories of Human Origins Complete Replacement ModelRegional Continuity ModelPartial Replacement Model
6 Complete Replacement Model (Recent African Evolution) Developed by British paleoanthropologists Christopher Stringer and Peter Andrews.Proposes anatomically modern populations arose in Africa in the last 200,000 years.They migrated from Africa, completely replacing populations in Europe and Asia.Does not account for the transition from archaic H. sapiens to modern H. sapiens anywhere except Africa.
7 Partial Replacement Model Proposed by Günter Bräuer of the University of Hamburg.Postulates the earliest dates for African modern Homo sapiens at over 100,000 y.a.
8 Partial Replacement Model Initial dispersal of H. sapiens sapiens from South Africa was influenced by environmental conditions.Moving into Eurasia, modern humans hybridized with resident groups, eventually replacing them.The disappearance of archaic humans was due to hybridization and replacement.
9 Regional Continuity Model (Multiregional Evolution) Associated with paleoanthropologist Milford Wolpoff of the University of Michigan.Populations in Europe, Asia, and Africa continued evolutionary development from archaic H. sapiens to anatomically modern humans.
10 The Regional Continuity Model (Multiregional Evolution) Question: How did modern humans evolve in different continents and end up so physically and genetically similar?Explanation:Due to gene flow between archaic populations, modern humans are not a separate species.Earlier modern H. sapiens did not originate exclusively in Africa.
11 Early Homo sapiens Discoveries From Africa and the Near East SiteDates (y.a.)Human RemainsCommentsQafzeh (Israel)110,00020 individuals (minimum)Large sample; variability in expression of modern traitsSkhu-l(Israel)115,00010 individuals (minimum)Earliest evidence of modern H. sapiens outside of Africa
12 Early Homo sapiens Discoveries From Africa and the Near East SiteDates (y.a.)Human RemainsCommentsOmo-Kibish (Ethiopia)120,000–80,000?Cranium and postcranial remainsSecond individual shows fewer modern traitsKlasies River Mouth (South Africa)120,000?Several individuals; fragmentaryPerhaps earliest modern H. sapiens in Africa
13 Early Modern Homo sapiens Discoveries - Europe, Asia, Australia SiteDates (y.a.)Human RemainsCommentsAbrigo do Lagar24,5004 y.o. child’s skeletonShows mixture of traitsVelho(Portugal)Interpreted as evidence of hybridizationCro-Magnon(France)30,0008 individualsFamous site of early modern H. sapiens; variability in expression of modern traits
14 Early Modern Homo sapiens Discoveries - Europe, Asia, Australia SiteDates (y.a.)Human RemainsCommentsOrdos(Mongolia, China)50,0001 individualPerhaps earliest evidence of H. sapiens in AsiaKow Swamp (Australia)14,000-9,000More than 40 individuals (all ages)Very robust individualsLake Mungo (Australia)60, ,0003 individuals, one cremationDate is controversial; recent extraction and analysis of DNA
15 Techniques for Dating Middle and Upper Pleistocene Sites Physical BasisExamples of UseUranium seriesRadioactive decay of short-lived uranium isotopesDate limestone formations; estimate age of Jinniushan site in China and Ngandong site in JavaThermoluminescence (TL)Accumulation of electrons in certain crystals released during heatingDate ancient flint tools; provide key dates for the Qafzeh siteElectron spin resonance(ESR)Measurement of trapped electronsDate dental enamel; corroborate dating various sites in Israel, Java, South Africa, and Australia
16 The New WorldAncestors of Native Americans reached the New World through migration over the Bering Land Bridge over many millennia.Debates continue, but at present, the only direct evidence of hominids in the New World date to about 12,000 y.a.
17 Anatomically modern Homo sapiens and Homo floresiensis
18 The Upper PaleolithicCultural period began in western Europe approximately 40,000 years ago.Industries based on tool technologies:ChatelperronianAurignacianGravettianSolutreanMagdalenian
19 Upper Paleolithic Tools (a) Burin. A very common Upper Paleolithic tool.(b) Solutrean blade. This is the best-known work of the Solutrean tradition.Solutrean stonework is considered the most highly developed of any Upper Paleolithic industry.
20 Cultural Periods of the European Upper Paleolithic Upper Paleolithic (beginnings)Cultural Periods17,00021,00027,00040,000Magdalenian Solutrean GravettianAurignacianChatelperronianMiddlePaleolithicMousterian
21 Cave Art Majority from southwestern France and northern Spain. Grotte ChauvetDating has placed the cave painting during the Aurignacian period more than 30,000 y.a.Images include stylized dots, human handprints and animal representations.Among traces are dozens of footprints on the cave floor produced by bears and humans.
22 AfricaRock art is found in southern Africa dating to between 28,000 and 19,000 y.a.Personal adornment dates back to 38,000 y.a. in the form of beads made from ostrich shells.Excavations in the Katanda area show remarkable bone craftsmanship.Intricate bone tools resembling harpoons were made from the ribs of large mammals.
24 1. Which of the following is NOT one of the hypotheses explaining the origins and dispersal of anatomically modern humans?the partial replacement modelthe regional continuity modelthe regional replacement modelthe complete replacement model
25 Answer: cThe regional replacement model is NOT one of the hypotheses explaining the origins and dispersal of anatomically modern humans.
26 2. Scientists are fairly clear on when anatomically modern Homo sapiens first appeared. TrueFalse
27 Answer: FalseScientists are not fairly clear on when anatomically modern Homo sapiens first appeared.
28 3. The _________________ holds that anatomically modern populations arose in Africa within the last 200,000 years, migrated out and replaced populations in Europe and Asia. They did not interbreed because they were a separate species.
29 Answer: Complete Replacement Model 3. The Complete Replacement Model holds that anatomically modern populations arose in Africa within the last 200,000 years, migrated out and replaced populations in Europe and Asia. They did not interbreed because they were a separate species.
30 4. The model also known as "Recent African Evolution" is based on the origin of modern humans in Africa and their interbreeding with local African populations.in Africa and their replacement of local populations in Europe and Asia.in China and their relatively recent evolution in Africa.simultaneously in Africa and China.
31 Answer: bThe model also known as "Recent African Evolution" is based on the origin of modern humans in Africa and their replacement of local populations in Europe and Asia.