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StudyFossil geologic


what fossils are A fossil is the naturally preserved remains or traces of animals or plants that lived in the geologic past.
How fossil form Fossils of hard mineral parts (like bones and teeth) were formed as follows: Some animals were quickly buried after their death (by sinking in mud, being buried in a sand storm, etc.). Over time, more and more sediment covered the remains.
The various types of fossils (cast, mold, etc) mold fossils -(a fossilized impression made in the substrate - a negative image of the organism) cast fossils -(formed when a mold is filled in)
what an index fossil is and what it is used for Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
the 4 main divisions of geologic time Eons, Eras, Periods and Epochs
period A division of geologic time representing one subdivision of an era; usually named for the locality in which the formations representing them were first or best described, or for some distinguishing characteristic of the formations.
Epochs A division of geologic time representing one subdivision of an eon and including multiple periods
eon represent the rich history of the precambrian, a division of the geologic time scale longer than the era; The largest division of ecologic time, including multiple eras
the 3 main Eras of the phanerozoic eon Paleozoic Mesozoic Cenozoic
how these eras are defined era denotes a clearly defined period of time of arbitrary but well-defined length, such as for example the Mesozoic Era
what eon, era,period, and epoch we are currently living in the Holocene (sometimes called Recent) epoch, Quaternary period, Cenozoic era, and Phanerozoic eon.
what the dominant life-forms were in each of these eras The Cenozoic Era
Fossil he remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
index fossil a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
Created by: powell14243