indeksoiduista
Indeksoiduista, also known as index fossils, are the remains or traces of ancient organisms that are used to determine the age of rocks and the relative ages of fossils. These fossils are typically hard parts, such as bones or teeth, that are resistant to decay and can be preserved in the fossil record. Indeksoiduista are particularly useful because they are widespread geographically and have a relatively short range in time, making them ideal for correlation between rock units.
The concept of indeksoiduista was first introduced by the Swedish geologist Johan Gunnar Andersson in the
Indeksoiduista are typically found in marine environments, as these settings often provide the ideal conditions for
- Trilobites: These are marine arthropods that lived from the Cambrian to the Permian periods.
- Ammonites: These are extinct marine mollusks that lived from the Devonian to the Cretaceous periods.
- Belemnites: These are extinct marine mollusks that lived from the Triassic to the Cretaceous periods.
Indeksoiduista are used in conjunction with other dating methods, such as radiometric dating, to provide a