Latest Research: Braarudosphaera sp

Varol, O. [1982]: Calcareous nannofossils from the Antalya Basin, Turkey. N. Jb. Geol. Palaont. Mh., 1982 : 244-256    

Varol, O. [1983a]: Late Cretaceous - Paleocene calcareous nannofossils from the Kokaksu section [Zonguldak, Northern Turkey]. - N. Jb. Geol. Palaont. Abh., 166[3]: 431-460    

Varol, O. [1983b]: Proposed calcareous nannofossil zonation scheme for the Miocene to Holocene of Southeast Asia. - Bul. Geol. Soc. Malaysia, 16: 37-46    

Varol, O. [1984]: New Neogene calcareous nannofossil taxa from Malta and Southern Turkey. - N. Jb. Geol. Palaont. Mh. 1984 : 375-384    

Varol, O. [1985a]: Miocene calcareous nannofossils from the Mut Basin, Southern Turkey. - J. Micropalaeont, 4[2]: 127-139    

Varol, O. [1985b]: The distribution of calcareous nannoplankton in surface sediments from the intertidal and shallow marine regimes of a marginal sea-Jason Bay, South China Sea. - Mar. Micropalaeont., 9:369-374    

Hughes, G.W., Varol, O & Dunkley, P.N. [1986]: Pleistocene uplift of Tetepare Island, Solomon Group, as implied by foraminiferal and calcareous nannofossil evidence.-Bul. Roy. Soc. New Zealand 24 : 397-408    

Varol, O. [1989a]: Palaeocene calcareous nannofossil biostratigraphy. In Crux, J.A. and S.E. van Heck [eds.]. Nannofossils and their applications. Ellis Horwood, Chichester, 265-310

Varol, O. [1989b]: Eocene calcareous nannofossils from Sile, Istanbul [Northwest Turkey]. - Revista Espanola Micropal. 21[3]: 276-320

Varol, O. [1989c]: Calcareous nannofossil study of the Central and Western Solomon Islands.- Circum Pacific Council for Energy and Mineral Resources, Earth Science Series, 12 : 239-268    

Varol, O. [1989d]: Quantitative analysis of the Arkhangelskiella cymbiformis group biostratigraphic usefulness in the North Sea Area. -J. Micropalaeont. 8[2] : 131-134    

Varol, O & Jakubowski, M. [1989]: Some new calcareous nannofossil taxa.- INA Newsletter, 11 : 24-29

Al-Rifaiy, I., Varol, O & Lemone, D. [1990]: Middle to upper Albian biostratigraphy of the Cuchillo Formation from Sierra de Sapello, Mexico.- Newsl. Stratigraphy, 21[3] : 187-200

Varol, O. [1991]: New Cretaceous and Tertiary calcareous nannofossils.- N.Jb. Geol. Palaeont. Abh. 182[1] : 211-237    

Hughes G.W., Varol, O. & Beydoun, Z. [1991]: Evidence for Middle Oligocene rifting of the Gulf of Aden and for Late Oligocene rifting of the southern Red Sea.- Marine and Petroleum Geology, 8 : 354-358    

Varol, O. [1992]: Revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy.- Newsl. Stratigraphy, 27[3]: 93-127    

Varol, O.[1992]: Sullivania a new genus of Paleogene coccolith.- J.Micropaleont. 11[2]: 141-150    

Varol, O. & Girgis M.H. [1994]: New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils.- N. Jb. Geol. Palaont. Abh. 192[2]:221-253.

Klungsoyr, T., Rafdal, J., Einchomb, C. & Varol, O. [1995]: The application of an integrated method for estimation of formation pressure in Vietnam - a case study. -IADC 1995 Asia Pacific Well Control Conference, 1-11.

Varol, O. & Houghton, S. [1996]: Didemnid ascidian spicules.- J. Micropaleot. 15: 135-149.    

Varol, O. [1998]: Palaeogene calcareous nannofossil biostratigraphy of the North Sea area.- Chapman & Hall, In Bown P.R. [ed.], 200-224.

Varol, O. [2004]: Salisia n.g. - a new Pliocene-Pleistocene coccolith genus.-N. Jb. Geol. Palaont. Mh. 2004[2]:119-128    

Hughes G.W., Varol, O., Gill, E. & Valldeperas T. [2004]: Biostratigraphy and depositional environments of Upper Cretaceous carbonates from les Collades de Basturs, southern Central Pyrenees.- Cour. Forch.-Ins.. Senckenberg, 247:149-15    

Varol, O. [2006]: Didemnid ascidian spicules from the Arabian Peninsula.- J. Nannofossil Res. 28 [1]:35-54    

Hughes, G.W., Varol, O., Al-Khalid, M. [2008a]: Late Oxfordian micropalaeontology, nannopalaeontology and palaeoenvironments of Saudi Arabia.- GeoArabia,. 13 [2]:15-46    

Hughes, G.W., Varol, O., Al-Khalid, M. [2008b]: Oxfordian biofacies and palaeoenvironments of Saudi Arabia.- GeoArabia,. 13 [2]:47-60    

Varol, O. [2013a]: New structural observation within Coccolithus, Clausicoccus, Toweius, Prinsius and Reticulofenestra. - Abstract in Geological problem solving with Microfossil III-University of Houston-March10-13, pp.110-112 [Abstract]

Varol, O. [2013b]: Taxonomic revision of Helicosphaera and its contribution to Cenozoic biostratigraphy - Abstract in Geological problem solving with Microfossil III-University of Houston-March10-13, pp.112-114 [Abstract]

daGama, R & Varol, O. [2014a]: New Oligocene to Miocene species. .- J. Nannoplankton Res. 33[1]: 1-12    

daGama, R & Varol, O. [2014b]: A new perspective on the structure of Neogene discoasters.33 [1]:23-28