2020 | 73/3 | 143–151 | 6 Figs. | 1 Tab. | 2 Pls. | www.geologia-croatica.hr Journal of the Croatian Geological Survey and the Croatian Geological Society

Age of the Jurassic hemipelagic sediments from the Ljubiš area ( Mt., SW ) Nikita Bragin1* and Nevenka Djerić2

1 Geological Institute RAS, Pyzhevsky 7, 119017 Moscow, Russia; (*corresponding author: [email protected]) 2 University of , Faculty of Mining and Geology, Kamenička 6, 11 000 Belgrade, Serbia; ([email protected])

doi: 10.4154/gc.2020.11

Abstract Article history: The type section of the Ljubiš Formation, (Djokov Potok, Zlatibor area, western Serbia) is charac­ Manuscript received January 24, 2020 terized by abundant poorly-to-moderately preserved radiolarians. The lower part of the type Revised manuscript accepted July 29, 2020 ­section is characterized by Middle Jurassic (?Bajocian to Bathonian) radiolarian assemblages Available online October 22, 2020 with Japonocapsa fusiformis (YAO), Takemuraella weghae (GRILL & KOZUR), Eoxitus hungaricus KOZUR, E. baloghi KOZUR, Helvetocapsa matsuokai (SASHIDA), Quarkus japonicus (YAO), Hexasaturnalis suboblongus (YAO), H. tetraspinus (YAO). Taking into account previous data from the upper part of the Ljubiš Formation, the age of the formation can be estimated to be in the interval from the ?Bajocian to Bathonian-Oxfordian. The new biostratigraphic data clearly show the onset of tectonic motion in the Middle Jurassic, documented by the presence of mass trans- port deposits intercalated in the radiolarite successions. This suggests a Middle Jurassic onset Keywords: Radiolaria, Dinarides, Jurassic, of ophiolite obduction which triggered the rapid deepening of the Adria margin, documented by stratigraphy, Serbia the abrupt change from carbonate to radiolarite deposition.

1. INTRODUCTION needs careful analysis of all sedimentary deposits, including their Various Mesozoic radiolarite deposits are common and wide­ biostratigraphy, facies, history of deposition, and tectonic events. spread in the territory of western and southwestern Serbia. Meso­ In recent work GAWLICK et al. (2017), SUDAR & GAW­ zoic radiolaria are found in pelagic and hemipelagic sediments LICK (2018) and GAWLICK & MISSONI (2019) propose a new deposited on the Neo-Tethys ocean floor, intercalated between stratigraphic scheme for the Triassic and Jurassic of the Inner Di­ Triassic shallow-water carbonate ramp and platform sediments, narides. Numerous stratigraphic series (formations) were ana­ and are widespread in Jurassic times on the Adriatic margin. lyzed: some of them were revised, others were established for the Their age determination, stratigraphy, and facies are important first time. Radiolarite formations in this scheme are most com­ for the reconstruction of tectonic motion and the arrangement of mon in the Middle and Upper Jurassic deposits. Biostratigraphic palaeo-oceanic basins and continental blocks. Due to the highly data of these numerous formations are variable. In some instances complicated structure of this territory, each palaeontological da­ they are very comprehensive, while in the other cases they are tum from radiolarite deposits and from carbonate clasts of the scarce or rare. Some formations still have only limited biostrati­ intercalated turbidites is highly important. graphic control and their stratigraphic positions were determined Radiolarians are the most often utilized fossils in such bi­ by indirect methods. GAWLICK et al. (2017) recently proposed ostratigraphic studies, due to their common presence in the Meso­ a late Middle Jurassic to Late Jurassic age for the Ljubiš Forma­ zoic radiolarites. Mesozoic radiolarian biochronology is essential tion, but the dating was not precise due to poor preservation of for the understanding of the palaeogeography and overall tectonic the radiolarians. structure of the Dinarides. There are numerous data on siliceous During the 2015 field season, we studied the reference sec­ sedimentary rocks associated with the ophiolite belts in the Dina­ tion of the Ljubiš Formation (sensu GAWLICK et al., 2017) in rides, Albanides and Hellenides which are often Middle to Late Djokov Potok, and present here the first biostratigraphic data Triassic, Middle Jurassic, or late Middle Jurassic to Late Jurassic from these sedimentary rocks based on radiolarians. in age (OBRADOVIĆ & GORIČAN, 1988; DJERIĆ et al., 2007; CHIARI et al., 2011; FERRIÈRE et al., 2015; GAWLICK et al., 2. GEOLOGICAL OVERVIEW 2017; BRAGIN et al., 2019b). It is very rarely possible to obtain The research area is situated in SW Serbia, in Ljubiš Village on Early Jurassic ages, and radiolarites of Early Jurassic age were the eastern flanks of Mt. Zlatibor. The wider area is characterized only discovered in two sections, at Angelokastron and Vothiki by a rather complicated structure. According to SCHMID et al. (Argolis), (CHIARI et al., 2013). (2008), it comprises the Adria-derived Drina-Ivanjica (DIU) and Numerous radiolarian studies have been carried out in Ser­ East Bosnian-Durmitor Units (EBDU), with the West Vardar bia during the last two decades (e.g. GORIČAN et al., 1999; ophiolites superimposed on top, i.e. presently located between DJERIĆ et al., 2007, 2012; GAWLICK et al., 2009, 2016, 2018; the DIU to the northeast and the EDBU to the southwest (Fig.1). VISHNEVSKAYA et al., 2009; CHIARI et al., 2011; BRAGIN Both Adria-derived units (Drina-Ivanjica and East Bosnian-Dur­ et al., 2011, 2019a, b) but a lot of the biostratigraphic age dating mitor) being thrust by the ophiolitic mélange during the Late Ju­ has still to be undertaken to solve the remaining open questions. rassic (SCHMID et al., 2008). The present-day position of the The difficult reconstruction of the geodynamic history of the Drina-Ivanjica above the East Bosnian-Durmitor unit is a result Adriatic passive margin and the ophiolite belts in the Dinarides of out-of-sequence thrusting during the Cretaceous (SCHMID et Geologia Croatica Figure 2.Asimplifiedgeologic mapoftheZlatibor-Zlatar areaDjokov withthepositionof after DJERIĆ et (modified al., 2012). Potok section Figure andadjacent 1.The SCHMIDetal., unitsofSerbia territories (modifiedafter maintectonic 2008). 144 Geologia Croatica 73/3 Geologia Croatica ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ ­ - - 145 like grey - grey - - Ivanjica Ivanjica – grey radiolarites water trench - - grey cherty mudstone. Thin - water basins were supplied by - advancing nappe stack and embed -bedded radiolarites intercalated with greenish bedded radiolarites intercalated with greenish - The ophiolite and distal continental margin nappes in -metre thick unit consisting calcareous of mass transport ”. Radiolarites this of formation are characterized an by abun In the Inner Dinarides, besides the sub-ophiolitic mélange, In contrast to these interpretations et al. GAWLICK (2017) grey thin - 3. SECTION DESCRIPTION AND BIOSTRATIGRAPHY The studied section is located in Village Ljubiš Donji and starts from the lower flow of Djokov PotokThe coordinates creek of the starting to point of thethe section west are 37’ N 43˚ studied We and andsampled the partlower 56.1”. 50’ E 19˚ uphill. of 14.0” this section Theup to 54.5”. E 50’ the 19˚ point 16.0” 37’ N 43˚ underlying formation at the is visible not surface. geological A column of the section is shown in Fig. 4.a two The section begins with deposits and turbidites intercalated with dark metres Five (Unit of dark 1). et al., 2017) greenish-(GAWLICK grey thin theunitin next The B). 5A, (Fig. 2) (Unit follow cherty claystone column is a 0.5 m thick greyup massivein the column, there calcareniteare dark greenish-grey thin-bedded ra (Unit 3). Further diolarites intercalated with greenish calcarenite bedsmassive grey a of m comprises appear1 5 Unit thick. m 8 is 4) (Unitunit 3 m above the baseof this unit.calcarenite The 5C). (Fig. section ends with The dark m of 12 green whole ish cherty mudstones (Unit 5D). 6) (Fig. these authors also distinguish different parautochthonous se quences the overthrust below units. & According to GAWLICK andMISSONI references(2019 therein) sedimentary mélanges derived from sedimentation processes in deep ded in a radiolarite bearing argillaceous matrix. According to these authors, the Djokov Potok locality in the Ljubiš village is the type section the of established newly Formation Ljubiš (Fig. These3). Jurassic radiolarites intercalated with calciturbidites deposited in a trench-like basin (Ljubiš Basin) outcrop in a tec tonic the window overthrust below allochthonous units (ophiolitic mélange and andSirogojno Mélange), belong to the parautoch thonous sequences between the Drina–Ivanjica Unit to the east and the East Bosnian Durmitor Unit to theet west (GAWLICK 2017). al., foreland basins in front the propagating of nappes triggered by ophiolite obduction. These deep the erosional products the of dance of radiolariangenerallyarestronglyrecrys theydance of tests, but tallized and very poorly preserved. Sometimes the radiolarians cannot be extracted from the rock: they become partly or com duringdissolved pletely the maceration process. Radiolarites were sampled and processed the by traditional method. Small (100 g) pieces of rockswa with washed was wereresidue theThen hours. 12 etched(HF)for acid ric by diluted (5-10%) hydrofluoter and dried. excluded the Late Triassic reefal and slope facies as remnants of an overthrust nappe. During the last years few investigations car ried on in SW Serbia et (GAWLICK al., and 2017 references therein) have beenfocused mélanges. the componentsof biostratigraphictheand of analysis on the litho- and microfaciesBased on the data analysis, obtained, p. 4) con et GAWLICK al. (2017, cluded: “ cluding different mélanges rest today as polyphasefar travelled transported nappe stack on an parautochthonousTriassic-Juras palaeogeographicallysedimentarywassituated sic sequencethat between the East Bosnian Durmitor Unit and Drina Unit , - ­ ­ ­ ­ ­ ­ ­ ­ ­ GAW ­negro) ­zed by travelled nappe -

GAWLICK & MISSONI & GAWLICK unit is characterized thick by carbonate plat - At At the beginning of the Jurassic, the carbonate plat

According to DJERIĆ et al. (2007), radiolarites of the Djokov Djokov the radiolarites of (2007), al. et DJERIĆ to According The East Bosnian-Durmitor Unit was definedby DIMI et al., 2017). et al., LICK The main Jurassic lithostratigraphic units of the Inner units Dinarides ( lithostratigraphic main Jurassic 3. The Figure Bragin and Djerić: Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia) (Tithonian;JurassicLate or 2008) al., 2019). GAWLICK et al. (2017) note that in Triassic-Jurassic timesTriassic-Jurassicin that note (2017) al. et GAWLICK 2019). these two units (Drina–Ivanjica and East-Bosnian Durmitor) were part of the same shelf – the Drina–Ivanjica Unit (slightly Eastthe thanarea distal shelf metamorphosed)more representsa Bosnian-Durmitor Unit (unmetamorphosed). Triassic-Jurassicthesedimentarypart section,a of as Potok suc cession formed along the Adriatic passive margin, tobelong the East Bosnian-Durmitor 2). Unit (Fig. a more distal or basinal slope facies represented cherty by lime TRIJEVIĆ and (1974) corresponds to the Accordingto “Zone (1970). al. AUBOUINandet Serbe” RAMPNOUX(1970) of DurmitorBosniancomprisesEast Unit the (2008) al. SCHMIDet externalsub-units,Durmitormore two the sub-unit (Monte RAMPNOUX,& PANTIĆ sedimentsform(RAMPNOUX, 1970; while the more1972), internal Lim sub-unit is characteri stones (the “Grivska Formation”, DIMITRIJEVIĆ & DIMI TRIJEVIĆ, and 1991) a Late Triassic reefal and slope facies occurGrivskaFormationall (DIMITRIJEVIĆ,Recently, 1997). rences are attributed to the allochthonous and far forms in the Inner Dinarides were drowned sud and a relatively den deepening the Adriatic of in shelf the Middle Jurassic re sulted in widespread deposition of radiolarites (DJERIĆ et al., All these sediments2009). al., et were VISHNEVSKAYA 2012; overthrust by the ophiolitic mélange and overlying ophiolites in the Late Jurassic 2). (Fig. andthe moreinternal The of Triassic Lim sub-unit Serbia). (SW the Durmitor sub with a palaeogeographic derivation al., far2017). to the east (GAWLICK et Geologia Croatica blage: blage: Potok section. Table 1.Speciesoccurrence Jurassic listofradiolarians from Djokov theMiddle 146 Helvetocapsa 1995a),al., et BAUMGARTNER in samples: datable next the contains radiolarite, thin-bedded greenish-grey, dark of ing (Table 1, Fig. 6, Plate 1, Figs. A-C, E-K). The consist unit, fourth of them can be toidentified generic levelor in open nomenclature Callovian. to Bajocian – sample this for range stratigraphic wide a mate esti to have we Therefore, 2009).(GAWLICK al., et Callovian & GAWLICK,ZUKI 2009), and capsa matsuokai ranges: stratigraphic broad have taxa Other comm.). (GAWLICK, pers. Oxfordian lower the in even and Callovian – deposits younger in present be also may species this that ing indicat samples several in radiolarians younger with association in also species this GAWLICK (2009)found & SUZUKI ever, How 3-5;al.,1995b) et inferred. BAUMGARTNER be can age an early-middle Bajocian to late (UAZs Bajocian-early Bathonian of Japonocapsa of presence basis the the On (= (= Hsuum Eucyrtidiellum Radiolarian taxa Radiolarian Samples Takemuraella veghae (GRILL &KOZUR) Parahsuum WHALEN) Parahsuum Praewilliriedellum convexum (YAO) MATSUDA Hsuum Praewilliriedellum sp. 2017 &Gawlick, Goričan Campanomitra? sp. A sensuO’Dogherty, Parvimitrella sp. sp. Quarticella (YAO) sp. cf.Eucyrtidiellum E. unumaense s.l. Helvetocapsa matsuokai (SASHIDA) japonicus(YAO) Quarkus Parahsuum sp. Eoxitus hungaricus KOZUR Japonocapsa fusiformis(YAO) Mizukidella Mizukidella & WHALEN) (PESSAGNO Parahsuum Eoxitus baloghiKOZUR Transhsuum sp. Hexasaturnalis tetraspinus (YAO) Hexasaturnalis suboblongus(YAO) &GAWLICK,GORIČAN 2017 sp.Quarticella DsensuO’DOGHERTY, Hsuum Theocapsomella sp. Hsuum Stichocapsa Sample 15-10-7 contains the following radiolarian assem radiolarian following the 15-10-7 Sample contains Unit by4 is poorly Some specimens. characterized preserved sp. cf. H.matsuokai ISOZAKI& sp. cf. H.baloghiGRILL&KOZUR sp. sp. Japonocapsa fusiformis sp., sp., sp. sp. sp. cf. P. sp. cf. P. indomitum Parahsuum

matsuokai

izeense sp. cf. E

japonica was found in the middle-late Callovian (SU Callovian middle-late the in found was (PESSAGNO &

sp., sp., . (SASHIDA), (SASHIDA), unumaense , in BAUMGARTNER et al., 1995a),al., et BAUMGARTNER in , Parvimitrella (YAO) (= Tricolocapsa (= (YAO) Quarticella 15-10-7 C C C C C R R R R R R s.l. (YAO), Eoxitus Quarkus 15-10-8 sp. (Plate 1, Table 1). C R

sp. is present in the the in sp. present is hungaricus

fusiformis

japonicus Quarticella 15-10-10 C C C R R R R R R

fusiformis Helveto (YAO), (YAO), Kozur, Kozur, 15-10-11 (YAO) (YAO) C C R R R R R R sp., sp., ­ ­ ­ - ­ ­ ­ , by arrows. 1–radiolarites andmudstones; 2–limestones andcalcarenites. Positions of samples with radiolarians are indicated on the right of the column (Ljubiš Formation). The numbers ofunitsare shown ofthecolumn. to theleft Figure 4.Alithological column ofthe Djokov Potok ofthelower part section within the entire section (see Fig. 4) and the age of sample 15-10-11 15-10-11 sample of age the and 4) Fig. (see section entire the within 1986;ZUR, O’DOGHERTY al., et 2017). 2006; the &(GRILL age Bajocian-Bathonian firms determination KO KOZUR) and of presence the Additionally, Bajocian to middle Bathonian) (BAUMGARTNER et al., (early-middle 6 1995b). UAZ to 3 UAZ from interval the suggests which gus Hexa of co-occurrence 15-10-10 the sample is of feature important most The them. date to allow us that ranges stratigraphic current with interlayers of greenish-grey cherty mudstones). cherty of greenish-grey interlayers with radiolarites, thin-bedded greenish-grey dark of up (made unit Plate 2). Samples 15-10-10 and 15-10-11 were L-P, D,Figs.taken from 1, the Platesixth (Table 6, Fig.1, radiolarians the of vation O’DOGHERTY, GORIČAN & GAWLICK,2017& O’DOGHERTY,and GORIČAN Campanomitra only it contains because determined not be age could The assemblage. radiolarian served liriedellum , in BAUMGARTNER et al., 1995a) and Considering the stratigraphic position of sample 15-10-10 sample of position stratigraphic the Considering Sample 15-10-10 yields several radiolarian species with con with species radiolarian several yields 15-10-10 Sample Radiolarites from Unit 6 are characterized by better preser by better characterized 6are Unit from Radiolarites Sample 15-10-8 is characterized by a poor and badly pre badly and poor a by characterized 15-10-8 is Sample ­saturnalis suboblongus sp. Hsuum Hsuum GRILL & KOZUR con sp. cf. GRILL H. baloghi (YAO) (= (= (YAO) Takemuraella weghae weghae Takemuraella Acanthocircus suboblon Acanthocircus H. Geologia Croatica 73/3

tetraspinus tetraspinus ? sp. Asensu (GRILL & & (GRILL Praewil (YAO) (YAO) ­ ­ - ­ ­ ­ - Geologia Croatica ­ ­ ­ ­ ­ - ­ ­ 147 sp. cf. E. cf. sp. un et al., 2017). The Also, Also, bedded greenish-grey GAW LICK

(GAWLICK et al., 2017). al., et (GAWLICK loured radiolarites with intercalated mass transport deposits and turbiditesin the upper part and dated radiolarians by and fora minifers (RADOIĆIĆ et al., According2009). et to GAWLICK the al. mass(2017) transport deposits in the upper part of the Gonje Formation (Kimmeridgian-Tithonian age) have a com Forma Ljubiš the spectrumof component different that to pletely tion. In contrast to the Formation containsGonje Fm. the Ljubis Dachstein lagoonalLate andTriassic back-reefal Limestone and thefromcomponentsJurassic Middle and condensedEarly some overlying of the Dachstein Limestone in the lower part, and in the upper part additional Late Jurassic shallow-water compo nents; the Gonje Fm. contains various clasts, e.g. Late Jurassic limestoneclasts, open-marine Triassic clasts; Late shallow-water various heavy minerals and others ( theence radiolarian of specimen Eucyrtidiellum Ljubiš Formation was dated at the type-locality only by the pres umaense radiolarites with intercalated turbidites of the Ljubiš Formation dou the inoverthrust themélange ophiolitic preserved below are ble road curve south of Ljubiš (between Ljubiš and Jasenovo). al. et TheseradiolaritesGAWLICK mélange, ophioliticfrom the were dated by a better(2016), preserved radiolarian assemblage re (2017) al. et GAWLICK Oxfordianage). Middle to (Callovian Ljubiš fromtheOxfordian middle age to Bajocianported latest a

- ­ - ­ ­ , in Tran Pseudoristola durisaeptum

Hsuum sp., P. indomitum P. cf. sp. sp., (YAO), (GRILL & KOZUR), Eoxitus Amphipyndax Parahsuum Mizukidella sp. Due sp. to the presence Takemu of (AITA) (= the assemblage is compatible with UAZs 3 to 6, Takemuraella weghae Takemuraella sp., Theocapsomella KOZUR,fusiformis Japonocapsa P. durisaeptum P. As some taxa were determined in open nomenclature and Sample 15-10-11 was taken from the uppermost layers of this of uppermostlayersthe from taken was 15-10-11 Sample raella raella weghae covering the time span from the Bajocian to the Bathonian. their data adequacy is we relatively low, can conclude that the lower part of the Ljubiš Formation has a Middle Jurassic, ?Bajo cian to Bathonian age. shsuum thonian-Tithonian) thonian-Tithonian) Gonje Formation (VISHNEVSKAYA et al., 2009) developed in the western part of the Dinaridic Ophiolite The FormationGonje is3). represented(Fig. belt by various co The Ljubiš Formation was proposed by GAWLICK et al. (2017) The FormationLjubiš waset al.proposed (2017) by GAWLICK as a possible age equivalent of the Middle to Upper Jurassic (Ba 4. DISCUSSION BAUMGARTNER et al., 1995a), 1995a), al., et BAUMGARTNER unit. The following species were identified from the radiolarian association: baloghi cf. sp. & WHALEN),(PESSAGNO discussed below, the age of this sample ranges from the Bajocian thefromranges thissample of age the discussedbelow, to the Bathonian (UAZs 3-6). The Bathonian age seems to be 2017). et al., more likely due to previous studies (GAWLICK Outcrops of the Ljubiš Formation in Djokov Potok. A – grey bedded radiolarites intercalated with grey cherty radiolarite-of detail – B 2; unit grey with mudstones, intercalated radiolarites bedded grey – A Potok. Djokov in Formation Ljubiš the of 5. Outcrops Figure of unit 6. 4; D – bedded radiolarites of unit radiolarites are unit 5, below calcarenite, massive unit 2; C – grey intercalation, mudstone Bragin and Djerić: Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia) Geologia Croatica part of (GAWLICK formation the part et al., 2017). newly The deter upper the from data radiolarian Bathonian-Oxfordian previous account into take we if Oxfordian the to lower-middle Bajocian the from range could Formation Ljubiš the of range graphic whole The strati of radiolarians. the preservation poor the to due For Ljubiš the Serbia). of The age of the samples part be cannot assigned very precisely lower SW the village, (Ljubiš DjokovPotok of in section type the in mation radiolarites in discovered were assemblages radiolarian (Bajocian-Bathonian) Jurassic Middle 5. CONCLUSIONS Formation on the western slope of Vis Mountain. According to BAUMGARTNER etal. (1995b)withadditionaldata from SUZUKI&GAWLICK (2009)andGAWLICK etal. (2009). taxa determined inopennomenclature andtaxafor whichthestratigraphic range needsmore detailedstudy. Stratigraphic ranges were attributed according to Figure 6.The stratigraphic radiolarian taxaandthestratigraphic ranges ofselected positionofthestudiedsamples. Dotted linesshow thestratigraphic ranges of 148 of Ljubiš the Formation. nature and of composition the understanding abetter achieve to would needed be of sections the analysis detailed and stratigraphy bio of the study Further Bajocian. late the in even or Bathonian early the –in thought previously than earlier havecould started Formation Ljubiš the of deposition the Anyway, clasts. worked re the than younger be should radiolarites these so Bathonian, clasts (GAWLICK et al., 2017), from known mainly the Bajocian- Bositra Jurassic reworked Middle contains samples of the Bajocian to the The Bathonian. Ljubiš Formation above our lower ofpart Ljubiš Formation) were deposited in the time period fore the from however,only contains Late Triassic quarry the clasts Krš DIU, the of succession sedimentary Jurassic Triassic-Middle nodu red by was derived material from the that Upper ­supposed turbidite this represented are clasts Bositra and limestone lar Jurassic Middle and Lower the while platform, carbonate Dachstein lagoonal the from derived (GAWLICK ponents 2017):al., et were components Triassic the com Jurassic Middle to Triassic Upper yield Formation, Ljubiš layers, in the to common Also, note it that turbiditic is important underlying the area, type the in that mentioned be should 1000m).It to (up sequence thicker much a expected authors the basin this of parts proximal most uninvestigated currently the In m. 400 least at is fill basin this a of more represents part of proximal the and basin the thickness A LICK GAW On the basis of our new data the analyzed radiolarites (the radiolarites analyzed the data new of basis our the On et al. (2017) the preserved part of the Ljubiš basin - reef. reef. -limestone. GAWLICK et al. (2017) al. GAWLICK et -limestone. Bositra limestones do not outcrop. not do outcrop. limestones limestone limestone ­ ­ ­ ­ ­ ­ ­ BAUMGARTNER, P.O., BARTOLINI, A., CARTER, E.S., CONTI, M., CORTESE, G., BAUMGARTNER,P.O., O’DOGHERTY, R., DUMITRICA-JUD, Š., GORIČAN, L., CELET,M., BONNEAU, J., AUBOUIN, P., CHARVET, CLEMENT,J., DEGAR ­ B., REFERENCES collabo and GERZINA. Nataša of esteemed the ration knowledge extraordinary the without possible been away 2019. June passed in GERZINA would notstudy The have Nataša fieldtrips, joint many After GERZINA. 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(YAO); H (YAO); lum sp.; L Plate Jurassic (Bajocianto Bathonian) 1.Middle radiolarians from theDjokov Potok (Samples15-10-7,15-10-8and15-10-10).A section 150 Takemuraella veghae (GRILL & KOZUR); P B –Eoxitus hungaricus KOZUR; C –Hsuum sp. cf. H.matsuokai ISOZAKI&MATSUDA; M sp.; –Quarticella I , N – andP Parahsuum sp.; D – Praewilliriedellum convexum(YAO). Figs. A ; 50μmfor figs. A – Parvimitrella sp.; J –Parahsuum sp.; E –Praewilliriedellum convexum (YAO); , B , D - –Campanomitra? sp. AsensuO’DOGHERTY, &GAWLICK, GORIČAN 2017;K M , O . – Quarkus japonicus(YAO); Quarkus F - C , E - I – sample 15-10-7; Figs. J N –Parahsuum –Helvetocapsa matsuokai (SASHIDA); sp. cf. P. , K – sample 15-10-8; Figs. D

izeense (PESSAGNO & WHALEN); (PESSAGNO –Japonocapsa fusiformis Geologia Croatica 73/3 G –Praewilliriedel –Eucyrtidiellum , L - P – sample – sample O – -

Geologia Croatica - 151 Japonocapsa Japonocapsa – sp. cf. cf. sp. Pseudoristola – sp.; O sp.; Hexasaturnalis suboblon – Hexasaturnalis Praewilliriedellum convexum (YAO);convexum – Praewilliriedellum – Theocapsomella N sp.; sp.; Hsuum – Hsuum M sp.; sp.; (GRILL & KOZUR); J KOZUR); & (GRILL veghae – Takemuraella I – 100 μm, other figures – 50 μm. – 100 μm, other figures – Mizukidella KOZUR; KOZUR; baloghi – Eoxitus sp. D sensu O’DOGHERTY, GORIČAN & GAWLICK, 2017: E GORIČAN & GAWLICK, D sensu O’DOGHERTY, – Quarticella sp. – sample 15-10-11. Scale bar – F O - sp.; H sp.; – Transhsuum G (PESSAGNO & WHALEN); L WHALEN); & (PESSAGNO indomitum P. cf. sp. GRILL & KOZUR; D H. baloghi GRILL & KOZUR; cf. sp. – sample 15-10-10: figs. G – sample 15-10-10: figs. F Parahsuum – Parahsuum - K – Hsuum C (YAO); (YAO); tetraspinus – Hexasaturnalis Middle Jurassic (Bajocian to Bathonian) radiolarians from the Djokov Potok section (samples 15-10-10 and 15-10-11). A Potok the Djokov from radiolarians Middle Bathonian) to (Bajocian Jurassic sp.; sp.; Parahsuum (AITA); (AITA); durisaeptum – Plate 2. Plate B F gus (YAO); Bragin and Djerić: Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia) (YAO). Figs. A Figs. ­fusiformis (YAO). P.