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17 Cards in this Set
- Front
- Back
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Eras |
Major divisions of geologic time that are divided into periods and further subdivided into epochs |
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Epochs |
Divisions of periods (which are the major divisions of eras) in geologic time |
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Fluorine dating |
A relative dating method that compares the accumulation of fluorine in animal and human bones from the same site |
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Chemical dating |
Dating methods that use predictable chemical changes that occur over time |
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Biostratigraphic dating |
Draws on the first appearance of an organism in the fossil record, that organism's evolutionary development over time and the organisms extinction |
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Paleomagnetic dating |
Based on the reversals of earths magnetic field |
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Electron spin resonance dating |
Uses microwave spectroscopy to measure electrons' spins in various metald |
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Thermoluminescence dating |
A relative dating method in which the energy trapped in a material is measured when the object is heated |
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Plesiadapiforms |
Lived in western North America, Western Europe, Asia and maybe Africa. •Lacks a post orbital bar and convergent eye orbits (their digits are not well-adapted for grasping tree branches) they lack opposability •highly specialized teeth and has a tiny brain •Some lacked the auditory bulla (middle-ear bones that are present in all primates) |
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Aegyptopithecus |
Arboreal quadruped |
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Adapids |
Diurnal Sexually dimorphic |
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Adapids |
Diurnal Sexually dimorphic |
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Omomyids |
Nocturnal Short snout |
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Sivapithecus |
12-8 mya - thick enameled teeth (adapted for eating hard things like nuts and seeds) - Robust jaw bones - concave faces - narrow nasal bones - oval eye orbits from top to bottom - projecting premaxillas |
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Dryipithecids |
- Sharp tusk-like teeth - long cheek teeth (good for chewing fruit) - long forelimbs, grasping feet and long grasping hands powerful and adapted for arm hanging arm swinging (locomotion) |
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Bipedalism: benefits and costs |
•Allows for a better view of the horizon, but exposes the individual to predators •walking while carrying heavy loads (CON) •circulatory system faces a greater burden |
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Molecular clock |
A chronology that shows the amount of time since two species diverged in their evolution Measures changes in dna over time |
