anthro - Chapter 8 Hominid bipedalism: o Foramen magnum is...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 8 Hominid bipedalism: o Foramen magnum is repositioned farther underneath the skull, so the head is balanced on the spine o Two distinct curves in the spine o Pelvis is shaped like a basin o Lower limbs are elongated o Femur is angled in, keeps the legs under the body o The big toe is enlarged Relative dating: comparison EX: stratigraphy, fluorine dating Chronometric Dating: dates the things X: K/Ar, Radiocarbon, Fission-track Olduvai Gorge (East Africa) northern Tanzania. Major fault line, we find skeletons as the rock moves Early hominids found in Africa 7-1 MYA o Pre-australopiths – earliest and most primative (7-4.4 MYA) Braincase is the size of Chimpanzees Probably bipedal o Australopiths – diverse forms, some more primitive, others highly derived (4.2 -1 MYA) Clearly bipedal Small brains Large teeth Become more derived after 2.5 MYA Paranthropus - big teeth Later Australopithecus (A. africanus) – small brain, big tooth, bipeds Early Homo o Early Homo – first member of our genus (2.4-1.4 MYA) First appearance in East Africa 2.4-2.3 MYA Olduvai – dates to 1.8 MYA Significantly larger brain (bigger cranial) 20% larger Key Terms: Faunal Remains: animal remains (fossil) Stratigraphy: study of the layers of deposit with the oldest at the bottom Postcranial: the part of the body under or behind the head (depending if quadruped or biped) Phylogeny: the evolutionary history of development within a species Encephalization: brain mass proportional to your size ETC: Miocene: warmth, many hominids, very derived
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1.5 MY A Hominids out of Africa 100 K Human brains the size today, early Sapiens in Africa. Neandethal and Erectuc in Old World 25 K Other homo extinct 7-8 MYA early homo Chimp 393 cc, Erectuc 935 cc, Neanderthal 1400 cc Chapter 9 Homo Erectus – a new grade of homo o Increase body size and robustness o Limb proportions change o Greater encephalization – their relative brain size is the same as H. sapiens o Species probably evolved in East Africa around 2-1.8 MYA o Quick migration to Asia and other continents – hit Java at 1.6 MYA and
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/04/2012 for the course ANTHRO 124P taught by Professor Fessler during the Spring '07 term at UCLA.

Page1 / 5

anthro - Chapter 8 Hominid bipedalism: o Foramen magnum is...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online