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| eon name that comes from the word hades and means the age of fire or molten rock |
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| eon name of very early life that contained primitive life called stromatolites |
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| Eon known for "jelly like bodies" that did not leave fossil evidence |
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| Eon since the Cambrian period |
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| period of first fossils called trilobites |
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| period of many marine invertebrates like shellfish or mussels |
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| period of first land plants |
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| period of first amphibians |
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| combined name for mississippian and pennsylvanian periods |
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| period of Pangea and the massive die off extinction of amphibians |
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| period of early dinosaurs the size of dogs and chickens that hunted in packs |
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| period when dinosaurs were dominant |
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| period of massive die off of dinosaurs |
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| epoch of the early horse eohippus or messohippus |
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| epoch of grasslands dominant |
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| epoch that encompasses now today |
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| in a series of rock layers the oldest rocks are found ...... |
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| in a series of rocks with an igenous intrusion in it the horizontal layers are ______ than the intrusion |
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| a gap in the rock fossil record caused by uplift and later erosion causing a jagged surface between rock layers |
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| rock layers are dated and correlated by using |
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| a fossil that is found over a wide geographic area but during only one time period is called an |
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| place these organisms in the supposed order that they would have occurred mammoth,fish, dinosaur, amphibian,man |
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| fish, amphibian, dinosaur, mammoth , man |
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| why were there no fossils prior to the cambrian period of the Paleozoic |
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Definition
| all organisms probably had jelly like bodies |
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| the amount of time that it takes for a radioactive substance to lose half of its mass in radioactive decay to some new element |
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| the supposed age of the earth |
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| a horizontal igneous melt between rocks |
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| a vertical igneous melt between rocks |
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| a rock that cools off slowly inside the earth |
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| a rock that cools off rapidly outside the earth with small or no crystals |
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| the half life of Carbon 12 |
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| why is carbon 12 no good after about 50,000 yrs |
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Definition
| it is all gone and turned into a stable element C14 or N |
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| what type of rock contains fossils |
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| put this sequence in order tilted by earthquake, horizontal layering under water, folding of horizontal layers, erosion causing an unconformity, deposition by water |
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Definition
| deposition by water, horizonal layers, folding of layers, tilting of layers by earthquake, erosion |
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| ancestor to the modern horse |
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| original supercontinent of the Paleozoic period |
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| Pangea broke up into these two parts |
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Definition
| Laurasia in the Northern hemisphere and Gondwanaland in the Southern hemisphere |
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| a crack in rock layers along which movement occurs |
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| an unconformity formed between two parallel sedimentary layers of rock |
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| an unconformity formed when parallel sedimentary beds overlay an igneous layer |
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| an unconformity formed when a parallel series over lays a tilted series of rock |
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| a fossil found for a short time over a wide geographic area |
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| structures on several different animals of differing species that suggest they may have had a common ancestor |
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| The amount of time it takes a radioactive element to loose half of its atoms |
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| the half life of Carbon 12 |
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| If I had 100 atoms of carbon 12 and its half life is 5,730 yrs, how many atoms would be left in 17,190 yrs? |
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Definition
12.5 atoms it goes from 100-50 in the first half life............then 50-25 in the second half life.....then 25- 12.5 in the third half life.
17,190/5730 = 3 half lives or 12.5 atoms left |
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Term
| if a fossil is found in several different horizontal layers is it a good index fossil |
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Definition
| no an index fossil is found in only one layer |
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| 3 eons included in the precambrian time period |
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Definition
| Hadean, Archean, and Proterozoic |
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| Period when the dinosaur became extinct |
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| Biggest theory about what killed the dinosaur |
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Definition
| Asteroid impact............left layers of the element iridium that is not very well spread normally on Earth |
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| Why no precambrian fossils? |
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| Epoch of major grasslands |
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| Epoch where birds were dominant |
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| Epoch of the early horse eohippus |
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| Period of the cenozoic made of Paleocene, Eocene, and Oligocene epochs |
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| Period of the Cenozoic beginning with the Miocene up until now |
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| Fossil common in Cambrian period rocks |
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| Fossils common in Ordovician rocks |
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| invertebrates and brachiopod shells |
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| First land plants were in what period |
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| Age of first amphibians and limestone deposits |
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| Name for the combination of the mississippian and pennsylvanian periods together |
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| geologic law that says oldest layers are found under younger layers |
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| geologic law that states that an igneous intrusion or dike is younger than any layer it cuts across |
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| geologic law that states that sedimentary rock beds are normally flat and level |
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| law of original horozontality |
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| geologic law that says that animal types generally change over time from simple to complex |
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| geologic law used to find missing layers when comparing many rock columns from different parts of the world |
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| type of rock all fossils are found in |
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