Chapter 8 Flashcards

1
Q

Relative dating

A

Dating methods indicating that something is older or more recents than something else

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2
Q

Stratigraphy

A

The principle that undisturbed underlying geologic deposits are older than overlying geological deposits

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3
Q

Principle of superposition

A

In a stratigraphic sequence, the lower layers were deposited before the upper layers

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4
Q

Radio potassium-argon dating

A

An absolute dating technique of dating fossils especially those in very ancient volcanic rock by using potassium minerals in the same strata as a reference

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5
Q

Earliest stone tools dated to approximately?

A

2.6 million years old

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6
Q

If an isotope has a half-life of 4 billion years, then in 4 billion years what will happen?

A

Half of the original amount will still be present

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7
Q

Which would be best suited to the suited carbon 14 dating technique?

A

Certain organic materials less than 75000 years old

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8
Q

Where have Miocene hominid fossils been found?

A

Africa
Europe
Asia

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9
Q

By about 2 mya?

A

There were one or more species of the genus Homo present in east Africa

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10
Q

Hominin emergence is characterized by the simultaneous appearance of bipedalism, toolmaking, and a large brain

True or false

A

False

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11
Q

The A. afarensis hand, wrist, and foot bones are distinguishable from those of modern humans

True or false

A

False

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12
Q

Typical primate traits

A
Forward facing eyes 
Grasping hands and feet 
Five digits 
Opposable thumbs and big toes 
Orbital closure 
Nails 
Lesser sense of smell and hearing 
Bigger brains
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13
Q

Extinction of Miocene Apes

A

Climate change

Tropical forests changed to cooler dryer mixed woodlands and grasslands

Does who survived did by following the tropics, adapting to forested areas, others to woodlands, and one group eventually to the ground

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14
Q

Hominin traits

A

Larger brains

Non honing canines

Bipedal

Language

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15
Q

Paranthropus

A

4-1 MYa

The robust Australopithecus
Larger, flatter face
Large

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16
Q

Monkeys

A

Have tails

Arms and legs of equal length

17
Q

Apes

A

No tails

Longer arms than legs