Tool culture 2 Flashcards
Describe the gradual increase in size of cranium and brain as hominin evolution
-increase to house larger brain (450-1350)
-increase number/depth of convolutions and size of frontal lobe
-foramen magnum moves to cranium centre
-sagittal crest for jaw muscle attachment dissipates
-nuchal area for neck muscle attachment becomes smaller
-cranium=smoother dome shaped
-brow ridge smaller
-less prognathism
What is an endocast
impression of internal brain case used to calculate cranial capacity of fossilised skull
Describe the change in prognathism and dentition as hominin evolution
-gradual decrease in molar size and robustness
-decrease prognathism
-brow ridge decrease size/prominence
-flattened face/developed chin
-dental arcade more parabolic
-lower jaw and teeth smaller(similar size)
-no diastema
Describe the change in torso and limbs as hominin evolution
-arms have shortened in proportion to legs
-femur slopes inwards towards knee manipulative ability improved in hands
-broader pelvis and smaller ribcage
-lumbar vertebrae more wedge-shaped (S shaped spine)
Determine the difference between cranial capacity and brain size
Brain size is inferred from cranial capacity.
Describe the features of Australopithecus
Bipedal form of locomotion and erect stance
-non-opposable, robust big toe parallel to other digits
-well-developed longitudinal arch
-foramen magnum more fwd/centre
-S shaped vertebral column
-long arms w/curved fingers for brachiation
-short, round pelvis
Teeth and skull
-short, non-projecting canines
-parabolic shape
-low forehead, more projecting jaw
-shorter growth period therefore less time with parents
Compare and contrast the two Australopithecus species
Afarensis:
-E.Africe (Ethiopia, kenya)
-3.4 m.y.a
-cranial capacity 430cm3
-low, sloping forehead prominent brow ridge
-diastema present
Africanus:
-2.7 m.y.a southern africa
-cranial capacity 460cm3
-smaller ridge and slightly arched forehead
-no diastema smaller teeth
Describe the features of Paranthropus robustus
-1.5 m.y.a southern africa
-large sagittal crest for attachment of strong chewing muscles
-large molars/premolars w/smalll incisors and canines
(to ground tough fibrous food)
-prognathism
-wide, dish shaped face w/large zygomatic arches (for muscles)
-heavy brow ridges
-structures for bipedalism
-cranial capacity 542cm3
Describe the features of Homo Habilis
-1.9 m.y.a E.S africa
-cranial capacity of 590cm3
-small brow ridge, moderate prog
-rounder skull and central foramen magnum
-teeth in rounder arc
-relatively short legs and long arms
-slightly curved finger bones=strong grip and can form precision grip
Describe the features of homo erectus
-1m.y.a N.E.S africa and W.E. asia
-cranial capacity of 1004cm3
-short, stocky body w/thicker bones=demanding life
-low, sloping forehead
-defined brow ridge
-large, thick jaw without a chin
-reduced size molars
Describe the features of homo neanderthalensis
-220000 y.a Europe and S.W. central Asia
-evolved for colder climate (large nose)
-cranial capacity 1485cm3
-big face, low large skull, heavy brow ridge
-lower jaw lacking definite chin
-larger brain than humans=robust skull and occipital bun
-short stature, robust, muscular (wider shoulders)
-thick, shorter limbs
Describe the features of homo sapiens
-300000 y.a. Africa
-cranial capacity 1350cm3
-short base and high braincase, thin walled skull w/ flat vertical forehead
-less prominent brow ridge, small jaw, less facial projection (prognathism)
-smaller teeth
-shorter arms compared to legs,
Describe the oldowan cultural period
2.15 m.y.a in olduvia valley, kenya
-homo habilis
-Simple pebble tools, scrapers, flakes of rock
-crudely fashioned, limited design visualisation
Describe the acheulian cultural period
(look at example pictures)
-1.7-200000 y.a. france
-homo erectus
-Bi-faced stone axes, spears
-more blows to=tear drop shape
-Greater cooperation, complex language development
-Used fire
Describe the mousterian cultural period
(look at example pictures)
-200-40000 y.a. france
-homo neanderthalensis
-Finer detailed handaxes and blades than Acheulian
-Use of flint (predictable in chips)
-practiced ritualised burial, music