Calcareous Nannofossils - Science topic

The concerned soil seems like calcareous in nature. Surprisingly , soil test values for P so high ,even Fe is good enough . Application of sulfur would be agood strategy to solubilise some calcium carbonate to netralise the soil pH. Have you separated CEC for calcium carbonate versus soil texture..??

Kindly read this work from Kenya

Hi Maqsood,

Take a look at this:

Cheers,

Nadir

Yes, these microfossils look like calcispheres.

Daniel:

Attached links would offer helpful insights:

Best

Syed

Sorry - no contradiction; I didn't have my book chapter to hand and that's the Con-Sant boundary that falls in UC11c. The Tur-Con boundary does indeed fall in UC9c, between base Broinsonia parca expansa (older) and base Micula staurophora (younger) - and M. staurophora is globally abundant soon after its base. As for the boundary marker being an inoceramid - do not underestimate the amount of work that has been carried out on various potential candidate sections, looking for the best section and best marker for the boundary. I have been working with a number of people on these sections for nearly 30 years! No section and no boundary event will ever be perfect, but having a GSSP to refer to is absolutely necessary to fix the boundary, so that all other works can refer to that fixed point. Otherwise, we would only ever have a 'floating' age-model, and every fossil group would have its own idea of the boundary, but these wouldn't directly correlate. Given this, you won't find a nanno marker that 'delineates' the boundary, because none falls at the proposed boundary, but you can bracket the boundary using nannos, and that is the precise way boundary biostrat works, that lends itself to precise correlation.

As for there being no documentation of the nannos around the Tur-Con boundary (apart from the book chapter, which synthesises a lot of work, and the paper I mentioned yesterday), one problem is that these are short stages and there are very few sections to examine, but see:

2008    Lees, J.A. The calcareous nannofossil record across the Late Cretaceous Turonian/Coniacian boundary, including new data from Germany, Poland, the Czech Republic and England. Cretaceous Research, 29: 40-64. doi:10.1016/j.cretres.2007.08.002 

I don't know if you're aware that Nannotax3 (http://ina.tmsoc.org/Nannotax3/index.html) is a free online nannofossil taxonomy database, the primary aim of which is to standardise nannofossil taxonomy...

I don't understand how you're applying biostrat to your section - (1) if it's non-marine, it's likely any nannos were washed in from deposits, (2) and if these are really marine incursions, then you look for markers and work out what age you have from what's present (or absent).

Can you upload the image of higher size?

Dear Monika,

Because your question was formulated: “Middle Triassic calcispheres?” I answered in this connection. On closer examination of attached photos, I turned my attention to the pictures 4 and 7. They resemble the sections of the species Gemeridella minuta Borza & Misik. I hope that for you in this case could be useful following articles:

1. Borza, K., Misik, M. 1975. Gemeridella minuta n. gen., n. sp. aus der oberen Trias der Westkarpaten. Geol. Zb., 26; 77-81.

2. Misik, M., Borza, K., 1978. Gemeridella, Didemnoides, Didemnum und Korperchen ahnlicher Gestalt aus dem Mesozoikum der Westkarpaten. Geol. Zb.– Geologica Carpathica, 29; 307–326.

Good luck!

Daria