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--- paleoenv_typical [20/03/2023 10:32] – mike_gss
+++ paleoenv_typical [10/05/2023 14:53] (current) – mike_gss
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 {{:paleoenv03.jpg?nolink|}}
 //Distribution of living foraminifera in the hydrosphere. Proportions of the three main foraminiferal groups in fossil assemblages are shown in the bottom strip.//
+{{:paleoenv06.jpg?nolink|}}
+//Different shell shapes of planktonic forams (keeled or non-keeled) reflect habitat-differences in relative water depth.//
 Groups such as ostracods can also be useful. Other planktonic microfossils can give more generalised information. Combination studies of various palynomorphs (often referred to as “palynofacies”) can also give useful paleoenvironmental and paleoclimate information.
 {{:paleoenv05.jpg?nolink|}}
 //Details of palynological components and their proportions in terrestrial and marine settings (courtesy of Katrin Ruckwied, Shell).//
+**Palynofacies** - A term often seen in conjunction with typical biostratigraphic reports is "palynofacies". This is a quantitative technique which examines not only the various species of palynomorph that make up an assemblage, but also the other organic matter (kerogen) contained within a palynological preparation. It also assesses - by means of measuring the colour of certain palynological objects such as spores - the degree of thermal change that the sample has undergone during burial. Palynofacies can provide a detailed paleoenvironmental breakdown of a succession when trends in these signals can be plotted.
+The uses of colour in fossils to determine thermal maturity is covered in more detail here [**NEED LINK**]
 A combination of data based on different microfossil (or macrofossil) groups is the most powerful tool for determining paleoenvironments.
 {{:paleoenv04.jpg?nolink|}}
 //Summary chart of the broad distribution patterns of the main microfossil groups (courtesy of Dr Jonathan Bujak, the Azolla Foundation).//
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 {{:paleoenv07.jpg?nolink|}}
 //Shape variation in Operculina ammonoides is related to depth of habitat. Measuring the dimensions of a species assemblage can be applied statistically to paleoenvironmental interpretations.//