index fossils definition
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Translations for index fossil Freebase(0.00 / 0 votes)Rate this definition: Index fossils are fossils used to define and identify geologic periods. 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.
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fossil The study of fossils is the domain of paleontology. The oldest fossils (of bacteria) are 3.8 billion years old. Note: The term is used figuratively to refer to a person with very old-fashioned or outmoded viewpoints: “That old fossil thinks that men should wear suits at the theater!”
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index noun, plural indexes, indices. [in-duh-seez] /ˈɪn dəˌsiz/ (Show IPA) 1. (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.
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- Index fossils are used to determine the _____ of the rock. was asked by Shelly Notetaker on May 31 2017. 395 students have viewed the answer on StudySoup. View the answer on StudySoup. Sign Up Login
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index Index. A book containing references, alphabetically arranged, to the contents of a series or collection of documents or volumes; or a section (normally at the end) of a single volume or set of volumes containing such references to its contents.
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fossil fossil. 1  any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc. 2  a markedly outdated or old-fashioned person or thing.
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What Are Characteristics of a Index Fossil? Index fossils help geologists to age rocks in which they form. When layers of rock have index fossils of two different eras, the index fossils are also useful in dating layers between which they form. Many index fossils are types of marine life.
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- Trace fossils (also called ichnofossils or lebenspuren) are the evidence of animal's activity. Unlike molds and casts which are evidence or replicas of skeletal remains or body impressions, trace fossils are sedimentologic or lithologic disturbance from an animal's (or plant's) activity such as resting, locomotion, or feeding.
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- Index cards. Index cards. The definition of an index is a guide, list or sign, or a number used to measure change. 1  An example of an index is a list of employee names, addresses and phone numbers.
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How do index fossils determine the age of rocks? Index fossils are used to identify layers of rocks. The layers form a sequence that relates to their age. In other words, a certain layer will contain fossils that are unique to that layer. Geologists have slowly, using different methods been able to determine the age of the rock layers. Once the age of the rock is known then the age of the fossil in that layer is known. This enables Geologist to use index fossils to date a certain layer where ever it occurs.
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- Photograph courtesy of the Australian Heritage Council. A fossil is the impression of a living organism that has been preserved. Fossils are preserved in substances such as sediments, coal, tar, oil, amber, or frozen in ice. There are three main types of fossils: body, trace and chemical.As well as body fossils, which are actual skeletal remains, there are impressions of soft animals, plants and footprints which have been left as mud hardened.ossils are preserved in substances such as sediments, coal, tar, oil, amber, or frozen in ice. There are three main types of fossils: body, trace and chemical. As well as body fossils, which are actual skeletal remains, there are impressions of soft animals, plants and footprints which have been left as mud hardened.
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index The definition of an index is a guide, list or sign, or a number used to measure change. 1  An example of an index is a list of employee names, addresses and phone numbers. 2  An example of an index is a stock market index which is based on a standard set at a particular time.
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What is a fossil? Fossils are the preserved remains or traces of animals and plants. They form by a process called fossilization. Fossils are usually found in rock, but they can also be found in mud or gravel. Most have lain buried for millions of years. The word fossil comes from the Latin word fossilis.
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Geology Anthology The Law of Fossil Succession is very important to geologists who need to know the ages of the rocks they are studying. The fossils present in a rock exposure or in a core hole can be used to determine the ages of rocks very precisely. Detailed studies of many rocks from many places reveal that some fossils have a short, well-known time of existence. These useful fossils are called index fossils. Today the animals and plants that live in the ocean are very different from those that live on land, and the animals and plants that live in one part of the ocean or on one part of the land are very different from those in other parts.
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DATING FOSSILS Index fossils are fossils that can be used to date the rock in which they are found. The best examples are fossils of animals or plants that lived for a very short period of time and were found in a lot of places. Ammonites, shelled relatives of today’s octopus, make ideal index fossils.ndex fossils are fossils that can be used to date the rock in which they are found. The best examples are fossils of animals or plants that lived for a very short period of time and were found in a lot of places. Ammonites, shelled relatives of today’s octopus, make ideal index fossils.
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- 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. guide fossil. fossil-the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil.
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Fossils - What is a Fossil? Fossils are the remains and traces of ancient organisms. A cluster of fossil ammonites, an extinct cephalopod. fossil (latin for obtained by digging) is the preserved remains or traces of organisms (plants, animals, etc) that lived in the distant past. The convention is that a fossil must predate recorded human history. While there is no defined date, typically something must be older than 10,000 years to be considered a fossil.
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Fossils Lacy bryozoan fossil found in the Redwall Limestone. Fossils are the preserved remains of ancient life, such as bones, teeth, wood, and shells. Trace fossils represent the presence or behavior of ancient life, without body parts being present. Footprints, worm burrows, and insect nests are examples of trace fossils.
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index index, periodontal disease (Russell index), n an index that measures the condition of both the gingiva and the bone individually for each tooth and arrives at the average status for periodontal disease in a given oral cavity.herapeutic index originally, the ratio of the maximum tolerated dose to the minimum curative dose; now defined as the ratio of the median lethal dose (LD50) to the median effective dose (ED50). It is used in assessing the safety of a drug. vital index the ratio of births to deaths within a given time in a population.
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Trace fossil Some trace fossils can be used as local index fossils, to date the rocks in which they are found, such as the burrow Arenicolites franconicus which occurs only in a 4 cm (1.6) layer of the Triassic Muschelkalk epoch, throughout wide areas in southern Germany.
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index Related to index: UV index. of a book or periodical, a list, nearly always alphabetical, of the topics treated. This list is usually at the back of a book, and the table of contents is in the front. The index seeks to direct the reader to all names and subjects on which the book has information.
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Index 1. An index is a method of sorting data by creating keywords or a listing of the data. A great example of an index of Computer Hope's hardware listing. 2. When referring to the Internet or web pages, an index is a file named as index.htm, index.html, index.asp, or index.php. The index file is the first file loaded when accessing a directory on a website.
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User Contributed Dictionary definition : fossilization Fossils (from Classical Latin fossilis; literally, obtained by digging) are the preserved remains or traces of animals, plants, and other organisms from the remote past. The totality of fossils, both discovered and undiscovered, and their placement in fossiliferous (fossil-containing) rock formations and sedimentary layers (strata) is known as the fossil record.
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fossil 1. A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in the earth's crust. 2. One that is outdated or antiquated: He was viewed as a fossil after decades in the same job.