paleoenv_sequences
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| The determination of paleoenvironments from fossils is important for sequence biostratigraphy (see separate section). Rather than identifying specific, individual paleoenvironments for rock intervals, in sequence biostratigraphy **trends** are more important – particularly with respect to shallowing- or deepening-upwards depositional sequences. Such trends can be very important in distinguishing between different types of systems tracts. | The determination of paleoenvironments from fossils is important for sequence biostratigraphy (see separate section). Rather than identifying specific, individual paleoenvironments for rock intervals, in sequence biostratigraphy **trends** are more important – particularly with respect to shallowing- or deepening-upwards depositional sequences. Such trends can be very important in distinguishing between different types of systems tracts. | ||
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| + | //Examining patterns and trends in biostratigraphic data sets enables the identification of sequence surfaces and systems tracts in a typical 3rd-order sequence cycle. This recognition relies on the ability to determine paleoenvironments and their changes (trends) in response to sea-level rise and fall.// | ||
| A simple, but common measurement to determine relative paleo water depth is the ratio of planktonic organisms (surface or near-surface dwellers) to benthonic organisms (substrate dwellers) – specifically Foraminifera. A typical whole foraminiferal assemblage will comprise both types of foram but in varying proportions depending mainly on the prevailing water depth: | A simple, but common measurement to determine relative paleo water depth is the ratio of planktonic organisms (surface or near-surface dwellers) to benthonic organisms (substrate dwellers) – specifically Foraminifera. A typical whole foraminiferal assemblage will comprise both types of foram but in varying proportions depending mainly on the prevailing water depth: | ||
paleoenv_sequences.1679310149.txt.gz · Last modified: 20/03/2023 11:02 by mike_gss