Two type of fossil age study
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Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods(or faunal stages).
Trace
A coprolite of a carnivorous dinosaur found in southwestern Saskatchewan.
Trace fossils consist mainly of tracks and burrows, but also include (fossil feces) and marks left by feeding Trace fossils are particularly significant because they represent a data source that is not limited to animals with easily fossilized hard parts, and they reflect animal behaviours. Many traces date from significantly earlier than the body fossils of animals that are thought to have been capable of making them.
Transitional
A transitional fossil is any fossilized remains of a life form that exhibits traits common to both an ancestral group and its derived descendant group..
Microfossils
Microfossil is a descriptive term applied to fossilized plants and animals whose size is just at or below the level at which the fossil can be analyzed by the naked eye.
Resin
Fossil resin (colloquially called amber) is a natural polymer found in many types of strata throughout the world, even the Arctic. The olde fossil resin dates to the Triassic, though most dates to the Cenozoic.
Derived
Eroded Jurassic plesiosaur vertebral centrum found in the Lower Cretaceous Faringdon Sponge Gravels in Faringdon, England. An example of a remanié fossil.
Wood
Polished section of petrified wood showing annual rings.
Fossil wood is wood that is preserved in the fossil record. Wood is usually the part of a plant that is best preserved (and most easily found). Fossil wood may or may not be petrified.
Subfossil
The term subfossil can be used to refer to remains, such as bones, nests, or defecations, whose fossilization process is not complete, either because the length of time since the animal involved was living is too short (less than 10,000 years) or because the conditions in which the remains were buried were not optimal for fossilization. .
Chemical fossils
Chemical fossils, or chemofossils, are chemicals found in rocks and fossil fuels (petroleum, coal, and natural gas) that provide an organic signature for ancient life.
Trace
A coprolite of a carnivorous dinosaur found in southwestern Saskatchewan.
Trace fossils consist mainly of tracks and burrows, but also include (fossil feces) and marks left by feeding Trace fossils are particularly significant because they represent a data source that is not limited to animals with easily fossilized hard parts, and they reflect animal behaviours. Many traces date from significantly earlier than the body fossils of animals that are thought to have been capable of making them.
Transitional
A transitional fossil is any fossilized remains of a life form that exhibits traits common to both an ancestral group and its derived descendant group..
Microfossils
Microfossil is a descriptive term applied to fossilized plants and animals whose size is just at or below the level at which the fossil can be analyzed by the naked eye.
Resin
Fossil resin (colloquially called amber) is a natural polymer found in many types of strata throughout the world, even the Arctic. The olde fossil resin dates to the Triassic, though most dates to the Cenozoic.
Derived
Eroded Jurassic plesiosaur vertebral centrum found in the Lower Cretaceous Faringdon Sponge Gravels in Faringdon, England. An example of a remanié fossil.
Wood
Polished section of petrified wood showing annual rings.
Fossil wood is wood that is preserved in the fossil record. Wood is usually the part of a plant that is best preserved (and most easily found). Fossil wood may or may not be petrified.
Subfossil
The term subfossil can be used to refer to remains, such as bones, nests, or defecations, whose fossilization process is not complete, either because the length of time since the animal involved was living is too short (less than 10,000 years) or because the conditions in which the remains were buried were not optimal for fossilization. .
Chemical fossils
Chemical fossils, or chemofossils, are chemicals found in rocks and fossil fuels (petroleum, coal, and natural gas) that provide an organic signature for ancient life.
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