What does a fossil record contain?
Fossil record. Fossil record, history of life as documented by fossils, the remains or imprints of the organisms from earlier geological periods preserved in sedimentary rock.
Evidence for evolution - fossils. Most of the evidence for evolution comes from the fossil record. Fossils show how much, or how little, organisms have changed over time. One of the problems with the fossil record is that it contains gaps.
- A fossil is the naturally preserved remains or traces of animals or plants that lived in the geologic past. There are two main types of fossils; body and trace.
- Fossils are formed in a number of different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt. Soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock.
- The fossil record shows that life on Earth has evolved, or changed over time. The fossils record provides evidence about the history of life and past environments on Earth. The fossil record also shows that different groups of organisms have changed over time.
We only know about extinct groups like dinosaurs, ammonites and trilobites through fossils. Some animals and plant are only known to us as fossils. By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other.
- FOSSILS ARE IMPORTANT FOR US FOR SEVERAL REASONS. THEY ARE THE BASIS FOR THE ORGANIZATION OF THE GEOLOGIC TIME TABLE. The appearance and disappearance of organisms throughout time is how we divide up the earths history into different periods. THEY PROVIDE EVIDENCE THAT EVOLUTION IS TAKING PLACE.
- Scientists combine several well-tested techniques to find out the ages of fossils. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actual ages of certain types of rock to be calculated.
- The fossil record, however, is quite incomplete. Here's one major reason why: Sediment has to cover an organism's remains in order for the long fossilization process to begin. Most organisms decompose before this can happen.
By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other. Often we can work out how and where they lived, and use this information to find out about ancient environments. Fossils can tell us a lot about the past.
- fossil record. A term used by paleontologists (see paleontology) to refer to the total number of fossils that have been discovered, as well as to the information derived from them. (See evolution of Earth.)
- Fossils or organisms that show the intermediate states between an ancestral form and that of its descendants are referred to as transitional forms. There are numerous examples of transitional forms in the fossil record, providing an abundance of evidence for change over time.
- Fossils, by definition, are the remains or traces of organisms that lived at least 10,000 years ago. This date marks the end of the Cenozoic Era and the Pleistocene Period on the geologic time scale. Paleontologists consider materials younger than 10,000 years ago “recent”. How old is the oldest fossil on earth?
Updated: 25th November 2019