Index fossil in american english.

Index fossil short meaning. In a typical fossil, the body form is retained, but the original molecules that made up the body have been replaced by some inorganic material, such as calcium carbonate (caco 3) or silica (sio 2).the fossil feels like, and is, made of rock. The noun index fossil has 1 sense: Index fossilsfossils of organisms that lived during a relatively short geologic time span.the three conditionsto be an index fossil, a fossil organism must be found throughout the world. The coiled shell is generally the only part of the ammonite to be preserved as a fossil.

The three most important fossil fuels are coal, petroleum, and natural gas. [ ĭn ′dĕks′ ] the fossil remains of an organism that lived in a particular geologic age, used to identify or date the rock or rock layer in which it is found. Index fossils are used to determine the age of many deposits that cannot be dated radiometrically. The fossil record is a huge collection of fossils that document the history of life on earth.

Fossils of animals, plants, or protists occur in sedimentary rock. Index fossil used as a noun is very rare. They work on the premise that, although different sediments may look different depending on the conditions under which they were laid down, they may include the remains of the same species of fossil. Keyed to the relative time scale are examples of index fossils, the forms of life which existed during limited periods of geologic time and thus are used as guides to the age of the rocks in which they are preserved.

Fossils are created when organisms die, are incased in dirt and rock, and are slowly replaced by minerals over time. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Fossil definition, any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc. A fossil that is found in many places and comes from the same time in history, so that….

Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata. Index fossils are used to determine the age of many deposits that cannot be dated radiometrically. In determining the age of related formations. Index fossils (also known as guide fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages).

Definition of index fossil : Index fossil (noun) any ancient remains of a plant or animal that lived during a specific geological period and that can be used to date the containing rocks. Women whose index finger was short compared to their ring finger were more likely to have what was regarded as a traditionally male job, the national research university in russia found. [noun] a remnant, impression, or trace of an organism of past geologic ages that has been preserved in the earth's crust — compare living fossil.

Fossil record examples the fossil record is filled with example organisms from earth's past. Every fossil tells us something about the age of the rock it's found in, and index fossils are the ones that tell us the most. The complex of data recorded in fossils worldwide—known as the fossil record—is the primary source of information about the history of life on earth. These are known as heteromorphs, from the greek heteros meaning different and morphe meaning form or shape.

Another term, zone fossil is used when the fossil have all the characters stated above except wide. Fossils of organisms that lived on earth for only a short time are called index. 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 familiarity information: (in geology and paleontology) a widely distributed fossil, of narrow range in time, regarded as characteristic of a given geological formation, used esp.

The best type of index fossils are usually those of swimming or floating organisms that evolved quickly (and therefore did not cover a long span of geologic history) and were. Oil and gas are hydrocarbons (molecules that have only hydrogen and carbon in them). Index the three eras of the precambrian are ______. A fossil is the remains or trace of an ancient living thing.

Molds and casts are other types of body fossils. Index fossil in american english any fossil of wide geographical distribution and a short range in time, used to correlate and date rock strata and their associated fossils webster’s new world college dictionary, 4th edition. A fossil record is a group of fossils which has been analyzed and arranged chronologically and in taxonomic order. Fossil fuels are fuels that come from old life forms that decomposed over a long period of time.

Be found in rock layers throughout the world. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages). If the species concerned were short. * evidence for dinosaur extinction and other extinctions can be found in rock layers throughout the world.

A fossil usually with a narrow time range and wide spatial distribution that is used in the identification of related geologic formations examples of index fossil in a sentence As well as being aesthetically pleasing and popular with fossil collectors, they are of particular value to geologists. An ideal index fossil lived during a short period of time, was geographically and environmentally widespread, and is easy to identify. A mold is an imprint left by the shell of a hard skeleton on surrounding rock, such as dinosaur bones buried beneath many layers of sediment.

Index fossil, any animal or plant preserved in the rock record of the earth that is characteristic of a particular span of geologic time or environment. * index fossils, which are widespread fossils that existed over a short period of time, are used to help correlate rock strata found in different locations. Freebase (3.20 / 5 votes) rate this definition: A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.

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