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Microfossil Mania!

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Microfossils of the Permian Florena Shale: Part 4

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Rumi

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In this entry I would like to show two of the commonest Foraminifera from my sample of the Florena Shale.  The most common forams by far are the fusulinids, but as these are not identifiable without thin sections, they will have to wait until I'm equipped to deal with them.  Excepting the fusulinids, the commonest foram is Globivalvulina bulloides (Brady, 1876):

 

G_bulloides.jpg

 

This taxon has an enrolled biserial structure, and in spiral view it typically exhibits one large and two smaller chambers, the sutures between them forming a rough T-shape.  In the umbilical view the triangular projection into the umbilical area is characteristic.  The many specimens show several different growth stages, but all are easily identifiable.

 

The second most common non-fusulinid is Tetrataxis corona Cushman and Waters, 1928:

 

T_corona.jpg

 

This taxon is looks much like a Chinese straw hat: a very low cone, with a concave umbilical area.  Chambers are added marginally, typically four per whorl, hence the generic name.  Specimens vary greatly in size, representing various growth stages.  The larger ones very frequently exhibit chipped or broken edges, probably due to postmortem damage.

 

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