Term
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Definition
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Term
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Definition
| 14-16 billion yrs old (byo) |
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Term
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Definition
| Dating rock by their surroundings |
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Term
| Principles of Relative Dating |
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Definition
1. Original Horizonality
2. Superposition
3. Cross Cutting
4. Inclusion
5. Faunal Succession
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Term
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Definition
| Uses radioactive decay to date items |
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Term
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Definition
| A gap in the geologic record that cannot be explained. |
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Term
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Definition
| Earth's magnetic field shifts every 10,000 years and N becomes S. Scientists can use this to date things, tho it is not used as often. |
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Term
Relative Dating Principle
Originial Horizonality |
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Definition
Layers of sediment are depsoited evenly, with each new layer being laid down horizontally over the old sediment.
_____________
_____________
______________ |
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Term
Relative Dating Principle
Superposition |
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Definition
IN a flat sequence of sedimentary rock, each layer is older than the one aove and younger than the layer below.
______________________ Youngest
_______________________
_________________________
_____________________________Oldest |
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Term
Relative Dating Principle
Cross Cutting |
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Definition
Any igneous intrusion is younger than the rock surrounding it.
___________i_____
______i
_________________i___________
_____________i_______
Instrusion is younger |
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Term
Relative Dating Principle
Inclusion |
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Definition
| One rock type contained within anohter. Any inclusion is older than the rock surrounding it. |
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Term
Relative Dating Principle
Faunal succession |
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Definition
| Using the fossil record to identify rock ages. (Trilobite-beginning of Paleozoic era) |
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Term
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Definition
| 90% of time of Earth's exisitence. Began about 4.6 mya up to 544 mya. Towards end of era, early bacteerial life i ocien forms. Practices photosynthesis. Plants use carbon dioxide, give off 'pollution' of oxygen. At this point, ozone layer has formed, which protects us from radiation from Sun, and oxygen allows for more complex plants and animals to evolve. |
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Term
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Definition
| Bacterial colonies-early life bacteria on Earth. |
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Term
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Definition
1. Cambrian
2. Ondovician
3. Silurian
4. Devonian
5. Carboniferous
6. Permian |
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Term
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Definition
Almost all marine groups (less sophisticated like jellies), come into existence. Trilobite-only llived in Cambrina and next perioed. Varied in size, very small to very large.
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Term
Earth's Period
Ondovician |
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Definition
| Earliest appearance of vertebrates-ended with mass extinction. |
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Term
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Definition
| Terrestrial life-plantes emerging on planet. Swamp-like enviroment. scorpions and millipedes on land. |
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Term
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Definition
| Age of fishes-fish and sharks diversify, plans spread all over surface. Lungfish. |
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Term
| Earth's Period-Carboniferous |
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Definition
| Warm, moist climate. No glaciation. Green house cycle. Lsuh, swampy forest. High levels of oxygen 27-28%. Very large organisms. Reptile evolve from amphibians. |
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Term
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Definition
Evolution of reptiles continues reptiles form two groups
diapsids-give rise to dinosaurs
synapsids-include ancesotrs of earliest mammals.
Ended with mass extinction, likely cooling period. |
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Term
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Definition
Known as age of reptiles.
Triassic
Jurassic
Cretaceous
Cenozoic |
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Term
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Definition
| 90 % of existence of Earth. 4.6 bya-544 mya. Ozone layer forms. More complex life forms can now form. |
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