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12 Cards in this Set
- Front
- Back
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What is biostratigraphy? |
- The element of stratigraphy that deals with the distribution of fossils in the stratigraphic record. - The organisation of strata into units on the basis of their contained fossils. |
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What is a biozone? |
- A stratigraphic unit identifiable on the basis of its fossil content |
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What are range biozones? |
- Observed stratigraphical range of the index taxon - Defined by its appearance and disappearance |
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What is total/local range biozone? |
- Total stratigraphical and geographical range of the index taxon - Local range is the observed stratigraphical range of a study area |
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Concurrent range biozone? |
- Defined by using overlapping stratigraphical range of several taxa |
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Partial range biozone? |
Corresponds to part of the overall range of the taxa, but constrained by the absence of a taxa above and below |
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Consecutive range biozone? |
Typically defined using successive species of a singular evolutionary lineage |
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Acme biozone |
Corresponds to a stratigraphic interval where a particular species were exceptionally abundant |
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Assemblage biozone |
Based on the assemblage of different taxa which is different from assemblages above and below |
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What makes a good zone fossil and relate this to ammonites? |
- Independent of environment (ammonites common in many kinds of sed rock) - Rapidly evolving (In Jurassic ammonites evolved rapidly, used to correlate biostratigraphical units with an average of 200,000 years or less) - Geographically widespread (marine species allowed ammonites to be wider spread than land organisms) -Abundant and well preserved (hard bodied organisms, very abundant) - Easily recognisable (huge variety of shell shapes and morphologies, easily recognisable features) |
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What is a GSSP? |
Global stratotype section and points Sites selected as global standard references for all named geological time divisions at the level of stage and system. |
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What is a province? |
Differences at generic level and at a regional scale |
