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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Comment on the quality of fossil record ? what is biomarker of early life?
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Sajan sarthak
The reliability of microfossils in stratigraphic and paleoenvironmental interpretation depends on how accurately the microfossil assemblage corresponds to the live community. The organisms after death undergo a complex transition from biosphere to lithosphere. The decay of the organic matter, post-mortem transport of the shells and their dissolution and diagenesis prior to and after burial under sediments determine the fidelity of the fossil records. The early taphonomic processes may cause preferential loss of some microfossils and post-mortem transport may move shells out of their original habitat with far-reaching implications for reconstruction of the past environment. Chemical susceptibility to diagenesis and dissolution may cause marked changes in trace elements and the stable isotope composition of the shells and, thus, limit the use of compositional data in paleoenvironmental and paleoclimatic interpretations. BIO MARKER What is meant by biomarker? A biological molecule found in blood, other body fluids, or tissue of organisms or plants to know the source of the hydrocarbons. Molecular biological markers, or biomarkers, are natural products that can be assigned to a particular biosynthetic origin
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Rahul kumar Best Answer
Quality of fossil record is of utmost important in order to analyse the minute morphological characters and gaining more information about ancient environment. Because most decay and fragmentation occurs at the surface, the main factor that contributes to fossilization is quick burial. Marine animals that die near a river delta may be buried by sediment carried by the river. A storm at sea may shift sediment on the ocean floor, covering and helping to preserve skeletal remains. On land, burial is rare, so consequently fossils of land animals and plants are less common than marine fossils. Land organisms can be buried by mudslides or ash from a volcanic eruption, or covered by sand in a sandstorm. Skeletons can be covered by mud in lakes, swamps, or bogs as well. Some of the best-preserved skeletons of land animals are found in the La Brea Tar Pits of Los Angeles, California. Although the animals trapped in the pits probably suffered a slow, miserable death, their bones were preserved perfectly by the sticky tar. Biomarkers encode information about ancient biodiversity, food chain associations and environmental conditions. They are recorders of element cycling, sediment and water chemistry, oxidation-reduction conditions and temperature histories. Most importantly, however, hydrocarbon biomarkers are stable for billions of years if they are enclosed in intact sedimentary rocks that have only suffered a mild thermal history (i.e. haven’t been heated up very much). Therefore, biomarkers offer a powerful means of studying geobiology—life and its interaction with the environment. Structural and isotopic information allow them to be distinguished from abiogenic (non-living) organic compounds that exist throughout the cosmos. Refer to the attached figure for detail of early life biomarkers.