paleoenv_interp
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| It is the role of the biostratigrapher to take such matters under consideration. On the upside, even fossils that are not “supposed” to be in a particular sample can also provide us with useful information. Let’s take the simplest option first and assume that all our fossils in a sample are there “honestly”. How do we as geologists use fossils to interpret paleoenvironments? | It is the role of the biostratigrapher to take such matters under consideration. On the upside, even fossils that are not “supposed” to be in a particular sample can also provide us with useful information. Let’s take the simplest option first and assume that all our fossils in a sample are there “honestly”. How do we as geologists use fossils to interpret paleoenvironments? | ||
| - | * by direct comparison with living forms (however, points to remember…) | + | * By direct comparison with living forms (however, points to remember…) |
| - | * the modern ocean is currently at a “highstand” setting with the continental shelves more-or-less fully submerged. Sea levels have been (much) higher and lower in the past and change constantly under geologic timescales | + | * - the modern ocean is currently at a “highstand” setting with the continental shelves more-or-less fully submerged. Sea levels have been (much) higher and lower in the past and change constantly under geologic timescales |
| - | * modern global oceanic circulation patterns date only from the Pliocene after the Isthmus of Panama finally closed, separating the Atlantic from the Pacific Ocean and allowing the Gulf Stream to form. Another significant event occurred in the earlier Cenozoic with the opening of the Drake Passage between South America and Antarctica which first allowed complete global circulation around the Southern Ocean. | + | * - modern global oceanic circulation patterns date only from the Pliocene after the Isthmus of Panama finally closed, separating the Atlantic from the Pacific Ocean and allowing the Gulf Stream to form. Another significant event occurred in the earlier Cenozoic with the opening of the Drake Passage between South America and Antarctica which first allowed complete global circulation around the Southern Ocean. |
| - | * there is always a loss of information through the fossilisation process & diagenesis | + | * - there is always a loss of information through the fossilisation process & diagenesis |
| - | * some extinct fossil groups(e.g. graptolites, | + | * - some extinct fossil groups(e.g. graptolites, |
| - | * morpho-functional analysis – working out what “bits” of an organism has what function and how that function was “useful” to the living organism | + | * Morpho-functional analysis – working out what “bits” of an organism has what function and how that function was “useful” to the living organism |
| - | * association | + | * Association |
| - | * comparison | + | * Comparison |
| - | * statistical | + | * Statistical |
| - | | + | |
paleoenv_interp.1679307020.txt.gz · Last modified: 20/03/2023 10:10 by mike_gss