You will find some elements to answer your questionin the following sites

https://www.researchgate.net/post/What_are_the_biostratigraphic_index_characterizing_the_Triassic_time_types_of_dinoflagellates_pollen_ichnofossils

https://www.researchgate.net/publication/304148700_Palynological_zonation_and_correlations_of_latest_Triassic_in_the_Northern_Carnarvon_Basin

http://nora.nerc.ac.uk/id/eprint/508848/1/Riding%20MS%20Supplement%202%20to%20C46.pdf

http://bora.uib.no/bitstream/handle/1956/12654/144801995.pdf?sequence=1

http://www-odp.tamu.edu/publications/122_SR/VOLUME/CHAPTERS/sr122_23.pdf

First maybe it will be important to know in what part of the world are you looking at Triassic! Maybe if you work in Moroccan sediments it will be interesting the papers of Iberian peninsula and Italy!!!!

I have work in Barents Sea we did have in house biozones but all the time I was looking for references to update our understanding and definition of the boundaries!

- Ogg, J.G .The Geologic Time Scale 2012, 681-730, Elsevier Publ., Boston, USA. - see the Triassic chapter is a general book but helps to start!

A nice book and nice compilation for Barents Sea (the authors have been studying exhaustively the Triassic)

- Vigran, J.O., Mangerud, G., Mørk, A., Worsley, D. & Hochuli, P.A. 2014: Palynology and geology of the Triassic succession of Svalbard and the Barents Sea. Geological Survey of Norway Special Publication, 14, 270 pp

- Vigran, J.O., Mangerud, G., Mørk, A., Bugge, T. & Weitschat, W. 1998: Biostratigraphy and sequence stratigraphy of the Lower and Middle Triassic deposits from the Svalis Dome, central Barents Sea, Norway. Palynology, 22, 89-141.

- Vigran, J.O., Mørk, A., Forsberg, A.W., Weiss, H.M. & Weitschat, W. 2008: Tasmanites-algae contributors to the Middle Triassic hydrocarbon source rocks of Svalbard and the Barents Shelf. Polar Research, 27, 298-317.

In the Barents Sea they did have the project Force focused in the Middle to Late Triassic and several publication have emerged for the Norian/Carnian

Niall W. Paterson published few papers about it ...based on which you can refine a zonation!

Chapter Palynology, Paleozoic and MesozoicPalynology, paleozoic and mesozoic

- https://geus.academia.edu/SofieLindstrom _ published a lot about Triassic more Nowegian basin

There is also several publications from Iberian peninsula and Italy

- India also does have lots of publications and a book dealing with taxonomy and nomenclature wit some ages in it! http://www.bsip.res.in/pdf/Catalogue%20Archana%20Vijaya.pdf

There is load of stuff depending upon what are you looking at and what are your goals and answers!

I agree with Sandra Domingues Gomes and if you are interested on Triassic palynology you would check the works of Dr José B. Diez (Spain) or Dr Evelyn Kustatscher (Italy). They have a lot of publications about this period.

Some works that you should read are the following:

late Perman and Middle Triassic palynozones:

Article Correlation of Lopingian to Middle Triassic Palynozones

Anisian correlation:

Article Anisian Floras from the NE of Iberian Penninsula and Baléari...

Flora and microflora of Late Triassic:

Chapter Flora of the Late Triassic

and also, you could check the work:

Article Triassic palynology of central and northwestern Europe: A re...

Dear Jean-Jacques,

I thank you for the interest you gave to my question. I also thank you for sharing with me these documents of great values, I am very grateful to you.

Abdelkrim,

Dear Sandra Domingues Gomes,

My subject is the dating of sediments attributed to the Triassic in the Moroccan Mesetian domain belonging to the Central Atlantic domain. the age of these sediments "Triassic" was determined by the dating of the CAMP basalts. the objective is to specify this age (middle or upper triassic).

I thank you for these very interesting articles that you have shared.

Best regards,

Abdelkrim

Dear M.A. Juncal,

Thank you for your answer and thank you for sharing these references that are very interesting for me.

Best regards,

Abdelkrim

Not relating to palynology but larger benthic foraminifera (genera like Triasina and Aulotortus, for example) and dasycladacean green algae are good for defining the Triassic , especially if you are looking at platform carbonates. Alternatively, nannofossils (e.g. Prinsiosphaera and Eoconusphaera) are good for the Late Triassic.

Dear David Patrick Gold

Thanks for your interesting answer