geo time scale
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Eon | the largest group; divided by the CAMBRIAN BOUNDARY (about 550 million years ago) when the variety of life forms explodes; billions of years ago
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| Era | mass extinctions mark the boundaries between the eras; hundreds of millions of years long
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| period | blocks of time when a unique rock series was laid down; tens of millions of years long
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| Epoch | divisions of the most recent periods; several million years ago
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| molds and casts | acids eat away the skeletonor shell and leave an impression (mold) in the rock; if the mold fills with minerals, it becomes a cast
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| tracks and trails | imprints are left in mud which later hardens; dinosaur tracks are fairly common
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| carbonization | oils leave the plant, and the remaining matter becomes a layer of carbon; in other cases, nitrogen, hydrogen, and oygen are distilled from the plant; most common method of fossilizing plants
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| petrifaction | minerals in plant cells crystallize; minerals enter openings or cavities in shells or bone; common with plants
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| replacement | object buried in mud has its molecules replaced by minerals; rare
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| recrystallization | mineral aragonite in shells turns into calcite; preserves the general shape of the animal
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| soft tissue preservation | mummification, frozen in ice
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| traps | whole organisms locked in tar pits, asphalt, amber, ect.
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| cenozoic | quaternary, tertairy, halocene, pleistocene, pliocene, miocene oligocene, eocene, palecene
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| mesozoic | cretaceous, jurassic, triassic
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| paleozoic | permian, carboniferious, devonian, silurian, ordovician, cambrian
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| precambrian | proterzoic, archaean, hadean
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| fossil | are the imprints or remains of organisims that were once alive
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Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
aaronbrown1
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