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What are the three criteria that must be met in order for a fossil to be considered an index fossil?
Shorty2012
An index fossil is organisms that is a signature for certain geographical eras. Index fossils are a charting of time that is used to describe other organisms found in that time era. The fossils were found in the stones that are determinations by carbon indexing and therefore are index fossils.
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Why did geologists develop the geologic time scale?
The geological time scale is the geologic history of the planet from formation to the present. It starts with large divisions of time called eons and is subdivided into successively smaller units of time based on dominant lifeforms, extinction events, even climate. The development of the geologic time scale was initially based on the observation and reasoning that deeper layers of rock are generally older than less deep layers in what is called the "Law of Superposition".Paleontologists look for index fossils in fossil bearing sedimentary rock. Index fossils are organisms that were widespread, rapidly evolving, and only existed for a short period of time as evidenced by their appearance in the fossil record of specific rock strata. The appearance of a fossil alongside an index fossil gives a rough approximation of the age of the fossil in relative terms as it would appear on the geologic time scale. The appearance of the same fossil alongside index fossils of different geologic ages means that the fossil organism spanned multiple geologic time periods. Associations of specific strata alongside radiographically datable igneous and metamorphic rock determines the absolute age of a fossil.A period of around 4,600,000,000 years, the largest groupings of geologic time are eons, followed in descending order by era, period, epoch, and age.The geologic time scale is very important, especially in fields involving the exploration and retrieval of fossil fuels, which are geologically date range specific.
When do you call a species endangered versus threatened?
In order to be considered endangered, the species is in danger of extinction. To be considered threatened, the species has to be likely to become an endangered species.
What is the importance of index fossils?
Index fossils are the fossils of short-lived species which, because of their short lives, can be used by scientists to identify the age of the rock strata in which they're found. (For example, if you know a certain species only lived in the Cambrian period, and you find some fossils of this species in some rock, then you know the other fossils you find in that rock must also have come from the Cambrian period.) Some examples of species that left behind index fossils, and their related historical periods, are:Billingsella corrugagta - Cambrian period, Palaeozoic eraCactocrinus multibrachiatus - Mississippian period, Palaeozoic eraScaphites hippocrepia - Cretaceous period, Mesozoic eraNeptunea tabulata - Quarternary period, Cenozoic eraSee the links below for more examples and info.
How does relative dating and absolute dating help scientists assemble a fossil record for an area?
Relative dating is the science determining the relative order of past events, without necessarily determining their absolute age Absolute dating is the process of determining an approximate computed age in archaeology and geology.
What is an index in a book?
(in a nonfiction book, monograph, etc.) a more or less detailed alphabetical listing of names, places, and topics along with the numbers of the pages on which they are mentioned or discussed, usually included in or constituting the back matter.2.a sequential arrangement of material, especially in alphabetical or numerical order.3.something used or serving to point out; a sign, token, or indication: a true index of his character.4.something that directs attention to some fact, condition, etc.; a guiding principle.5.a pointer or indicator in a scientific instrument.6.a piece of wood, metal, or the like, serving as a pointer or indicator.7.Computers .a.a value that identifies and is used to locate a particular element within a data array or table.b.a reference table that contains the keys or references needed to address data items.8.Also called fist, hand. Printing . a sign in the shape of a hand with extended index finger, used to point out a particular note, paragraph, etc.9.a light, smooth cardboard stock.10.the forefinger.11.a number or formula expressing some property, ratio, etc., of something indicated: index of growth; index of intelligence.12.Statistics . index number.13.Economics . price index.14.Algebra .a.an exponent.b.the integer n in a radical defining the n- th root: ∛ is a radical having index three.c.a subscript or superscript indicating the position of an object in a series of similar objects, as the subscripts 1, 2, and 3 in the series x 1 , x 2 , x 3 .d.winding number.15.Horology . a leverlike regulator for a hairspring.16.( initial capital letter ) Roman Catholic Church .a.Index Librorum Prohibitorum.b.Index Expurgatorius.17.( usually initial capital letter ) any list of forbidden or otherwise restricted material deemed morally or politically harmful by authorities: an Index of disapproved books relating to communism.18.Optics . index of refraction.19.Obsolete .a.a table of contents.b.a preface or prologue.-verb (used with object)20.to provide with an index, as a book.21.to enter in an index, as a name or topic.22.to serve to indicate: warm breezes indexing the approach of spring.23.to place (a book) on an official list as politically or morally harmful: The commissar insisted on indexing the book.24.to rotate (work) on a milling machine in order to repeat the milling operation at a new position.25.Economics . to adjust (wages, taxes, etc.) automatically according to changes in the cost-of-living level or another economic indicator, especially to offset inflation.
What are three conditions must a fossil meet in order to be an index fossil?
Relatively short rime span. To be an index fossil, a fossil organism must be easy to identify and many fossils of that organism must exist. You are using the 7th grade interactive reader...... Naughty naughty naughty
What three conditions must a fossil meet in order to be an index fossil?
Relatively short rime span. To be an index fossil, a fossil organism must be easy to identify and many fossils of that organism must exist. You are using the 7th grade interactive reader...... Naughty naughty naughty
What major criteria must product or process meet in order to be considered emerging technology?
The major criteria must a product or process meet in order to be considered emerging technology is its pureness and usefulness.
What major criteria must a product or process meet in order to be considered emerging technology?
The major criteria must a product or process meet in order to be considered emerging technology is its pureness and usefulness.
What three condition must a fossil meet in order to be an index fossils?
Relatively short rime span. To be an index fossil, a fossil organism must be easy to identify and many fossils of that organism must exist. You are using the 7th grade interactive reader...... Naughty naughty naughty
Larry Franklin a former DOD employee?
what criteria must an individual meet in order to be considered an authorized recipient
What are the four criteria that must be met in order to be considered a dwarf planet?
i clearly dont know the answer if im asking the question
What is the criteria for effective accounting system?
In order for an accounting system to be considered effective it must meet 3 criteria. It must provide accurate information, have useful information, and be presented in a timely manner.
What three features must a fossil have in order to be an index fossil?
* the organism must be common in rocks from most of the world *the organism must have lived for only a geologically short period of time( a few million years to a few hundred million years) *the organism must be easy to identify.(trilobites and ammonites are 2 kinds of organisms that are used as index fossils).
What three features must a fossil have a order to be an index fossil?
* the organism must be common in rocks from most of the world *the organism must have lived for only a geologically short period of time( a few million years to a few hundred million years) *the organism must be easy to identify.(trilobites and ammonites are 2 kinds of organisms that are used as index fossils).
How are fossils organized in the fossil record?
Fossils are arragned in sequential order because of the buildup of material over the top of them for millions of years. Hence, the oldest will be on the bottom. This can be altered by certain geoligical processes and will depend on the rockbed and formation present in the area.
Why is ice in a glacier considered to be a mineral but water from a glacier is not?
Water is not considered a mineral because it does not meet the requirement of having a solid crystalline structure. Ice does meet this criterion and therefore, it is considered a mineral.
