| A | B |
|---|
| Quaternary Period | Present day is part of this period |
| sedimentary rock | type of rock which contains fossils |
| Paleozoic Era | Era before the Mesozoic Era |
| fossils | preserved remains or traces of ancient organisms |
| uniformitarianism | principle that staes the present is the "key" to the past |
| Cenozoic Era | present day is part of this era |
| Age of Reptiles | Mesozoic era is also called this |
| extrusion | rock layer of cooled lava or volcanic layer |
| Age of Mammals | Cenozoic Era is also called this |
| erosion | major cause of unconformity |
| teeth, footprints, poop, nests, burrows | examples of trace fossils |
| Precambrian Time | longest time in Earth's history |
| minerals | most fossils form when hard parts are replaced by these |
| index fossils | tell relative age since they are widespread and lived specific times |
| trilobites | common index fossil like a beetle |
| mammals | warm-blooded animals with hair and mammary glands |
| hard parts | as animals decay, only these parts are left and have time to fossilize |
| extinct | when an organism no longer exist and will never exist again |
| lava | magma when it reaches the Earth's surface |
| Law of Superposition | older rock on bottom with youngest rock on top layer |
| periods | eras are proken into these smaller sections |
| amber | whole insect fossils with little or not change may be found in this tree sap |
| always younger | age of intrusive rock when compared to the layer it cuts through |
| continents | end of Cretaceous Period with Pangea |
| ice ages | occurs when Earth's climate cools |
| evolution | process of change over time of organisms |
| complex | more recent fossils show organisms have become more |
| simple | older rock fossils show these kinds of organisms |
| fault | area which show a break in Earth's crust |
| unconformity | area which shows a gap and lost layers |
| marine climate | marine fossils found in desert show climate used to be this |
| palezoic, mesozoic, cenozoic | three era on the geologic time scale |
| radioactive dating | dating with igneous rocks to show absolute age |
| order long span of time | why scientist use the geologic time scale instead of years |
| brick walls | what limestone looks like on a rock diagram |
| amphibians | animals which could live on land and water during the Paleozoic Era |
| bottom layer | where the oldest rock layer is located on a rock diagram |
| relative dating | ordering events in the way the happened |
| tar pits | animals found in these with blacky substance preserve whole |
| always older | age of fossils when compared to the rocks they are in |
| travel, mass, habits | what fossil footprints may help scientists learn |
| petrified fossils | when minerals replace all or part of an organism these type of fossils are formed |
| Tertiary and Quaternary | two periods in the Cenozoic Era |
| Triassic, Jurassic, Cretaceous | Period in the Mesozoic Era |
| broken lines likes dashes | what shale looks like on a rock diagram |
| small dots on the layer | what does sandstone look like on a rock diagram |
| epochs | periods are divided into these smaller units called |
| black or symbols like v's | what does an extrusion layer look like on a rock diagram |
| blob or not horizontal cutting through | what does an intrusion layer look like on a rock diagram |
| inclusion | occurs when a solid, liquid, or gas gets trapped in rock while it is forming |
| fault is younger | which is younger the fault or rock layers it cuts through |
| coal | fossils which is used as a fuel from swamp plants |
