ANT101 Lecture 15 Detailed Notes

Large Brain: Human brains are significantly larger compared to other primates.
Anatomical Features: Associated with bipedalism (adaptations for walking on two limbs).
Reduced Canines: Humans possess very small canine teeth.
Flat Faces: Characterized by orthognathic (flat facial) features.
Tool Modification: Ability to modify raw materials into recognizable tools.
Chin Development: Presence of a chin is unique to humans.
Language: Ability to learn and invent language.

Oldest Tools: Tools dated to approximately 3.3 million years ago.
Possible Makers: Speculated to be made by hominins such as A. afarensis or P. aethiopicus.
Lomekwian Tool Culture: Involves simple hammer and anvil techniques.
Comparison to Primates: Tool-making techniques are primitive and akin to monkeys breaking nuts.

Timeline: Emerged around 2.5 mya; several hominin species were still living in Africa at this time.
Physical Changes: Transition in body form occurs around 2.3-1.7 mya.
Key Features of Genus Homo:
Larger, more rounded braincase
Less projecting facial features
Smaller teeth
More efficient bipedalism

Discovery: First discovered in 1964 by Louis Leakey in Olduvai Gorge, Tanzania.
Existence: Lived from 2.0 to 1.6 mya.
Geographical Range: Found in both eastern and southern Africa.
Brain Size: Ranged from 661 to 503 cubic centimeters (cc).
Associated Tools: Linked to simple stone tools known as Oldowan.
Physical Characteristics:
Prognathic face with no sagittal ridge
Large incisors but small postcanine teeth
Slightly curved phalanges indicating climbing abilities, yet bipedal.

Location: Situated in the Serengeti Plains of Northern Tanzania.
Significant Contributions: Provides extensive information on hominins and their evolution.
Geological Features:
Faulting: Exposes geological beds critical for studies.
Rapid Sedimentation: Enables excellent preservation of bones and artifacts.
Volcanic Activity: Allows for radiometric dating of finds.

Oldowan Tool Industry: Tools from this industry are approximately 2.6 million years old and include percussion manufacture techniques.
Zinjanthropus Discovery: Discovered by Mary Leakey in 1959, known today as Paranthropus boisei.

Assumed Tool Maker: Initially thought to be the first hominin to create and utilize tools until Lomekwian tradition was revealed.
Tool Characteristics: Oldowan tools are rough stones with chips removed for sharp edges.

Homo habilis vs. Australopithecus: Debate on whether H. habilis should be classified more closely to Australopithecus due to insufficient evidence for significant cognitive or morphological differences.
Coexistence: H. habilis existed alongside robust australopithecines for about 1 million years.

Discovery Timeline: H. rudolfensis discovered by Richard Leakey in 1972, existing around 2.4-1.6 mya.
Distinguishing Traits: Differences noted in diet, body size, brain size (approximately 736 cc), and facial morphology.
Taxonomy Confusion: Uncertainty whether they represent one variable species or distinct species.

Appearance & Tool Use: Marking the transition to more complex tools and widespread dispersal outside Africa.
Timeframe: H. erectus existed from approximately 1.8 million years ago until around 250,000 years ago.

Dispersal: H. erectus is noted as the first hominin to migrate out of Africa, showing evidence of geographical diversity and adapting to different environments.

Chronology: The Pleistocene epoch spans from 1.8 million years ago to about 10,000 years ago and is characterized by significant climatic changes, including multiple glaciations.
H. erectus Findings: Found in various parts of the Old World, indicating a successful adaptation and expansion of the species.

Looking Ahead: Next lecture will include a film on evolution, scheduled for March 5, with Lab 8 set for March 6/7.