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Representative ammonites from the upper Valanginian to basal Barremian Section C, Bersek Quarry. (A) Crioceratites nolani (Kilian) (Inventory no: 2002.93) Bed 230, (B) Euptychoceras cf. meyrati (Ooster) (2002.502) Bed 211, (C) Oosterella cultrata (d'Orbigny) (2002.161) Bed 245, (D) Neocomites neocomiense (d'Orbigny) (2002.311) Bed 253, (E) Olcostephanus nicklesi Wiedmann and Dieni (2002.151) Bed 253, (F) Olcostephanus hispanicus (Mallada) (2002.148) Bed 236, (G) Neolissoceras grasianum (d'Orbigny) (2002.35) Bed 234, (H) Jeannoticeras jeannoti (d'Orbigny) (2002.157) Bed 214, (I) Subsaynella mimica Thieuloy and Bulot (2002.171) Bed 210, (J) Subsaynella cf. sayni (Paquier) (2002.170) Bed 213, (K) Neocomites subpachydicranus (Reboulet) (2002.310.1) Bed 257, (L) Phyllopachyceras winkleri (Uhlig) (2002.200) Bed 255, (M) Olcostephanus densicostatus (Wegener) (2002.136) Bed 253. Figured fossils are deposited in the Palaeontological Department of the Hungarian Natural History Museum, Budapest. Scale bar represents 10 mm.
Source publication
An integrated biostratigraphic subdivision, on the basis of ammonites and belemnites, is proposed for the Lower Cretaceous siliciclastic succession of the Bersek Quarry (Gerecse Mountains, Hungary). Rich ammonite faunas permit recognition of many of the recently established Mediterranean ammonite zones, from the upper Valanginian Varlheideites pere...
Contexts in source publication
Context 1
... Major elements and distribution and specimen numbers of the cephalopod taxa in Section D (Beds 301-411) of the Bersek Quarry. Phylloceratid and lytoceratid am- monites are excluded. Only those beds which yielded ammonites determinable on generic level at least, are given. The symbol *** indicates mass occurrence fauna (F} ozy, 2004). O. cultrata (Fig. 3C), O. cultrataeformis, O. gaudryi, O. ondulata were found in situ, while O. fascigera was recognised only in the old collection of Geological Survey from the Bersek ...
Context 2
... olcostephanids in the Beds between 248-253, de- termined as Olcostephanus nicklesi, (Fig. 3E) probably indicate the upper level (Olcostephanus nicklesi Subzone) of the zone. The first appearance of the extremely uncoiled Himantoceras sp. preceeds slightly the appearance of O. nicklesi; this observation, agrees well with those in the classical sections in France. Himantoceras trino- dosum, index species of the former ...
Context 3
... the Hungarian material, the presence of the upper subzone of the Criosarasinella furcillata Zone (Teschenites callidiscus Subzone) can be documented by means of a single specimen of Teschenites cal- lidiscus from Bed 243 (Janssen and F} ozy 2004, pl. 1, fig. 13.). Some of the most important upper Valanginian and Hauterivian ammonites are shown on Fig. ...
Context 4
... platform deposits of France. Consequently, this species is missing from the deeper-water Hungarian fauna. Never- theless the Valanginian/Hauterivian boundary can be drawn in the Bersek Quarry. The contemporary appearance of the genus Saynella, (represented by a big, smooth specimen) and an ammonite, de- termined here as Olcostephanus hispanicus (Fig. 3F) (possible syno- nym of Olcostephanus bigoti, according to M. Company, pers. comm. 2005), and also the bloom of the genus Crioceratites in the Bed 236 suggest that the boundary can be placed between Beds 236 and ...
Context 5
... the entire Hautervian, phylloceratids, lytoceratids, and representatives of the genus Crioceratites (Fig. 3A) are abun- dant. Beds represented the lower part of the stage are rich in Neolissoceras (Fig. 3G) and Bochianites sp. The varied Jeanthieuloy- ites fauna, originating from the Valanginian, comprises numerous specimens close to the Jeanthieuloyites rossfeldensis/meneghini group(s). The successive assemblages show large variability in ...
Context 6
... the entire Hautervian, phylloceratids, lytoceratids, and representatives of the genus Crioceratites (Fig. 3A) are abun- dant. Beds represented the lower part of the stage are rich in Neolissoceras (Fig. 3G) and Bochianites sp. The varied Jeanthieuloy- ites fauna, originating from the Valanginian, comprises numerous specimens close to the Jeanthieuloyites rossfeldensis/meneghini group(s). The successive assemblages show large variability in terms of the style and strengths of ribbing, without any significant morphological ...
Context 7
... specimens of Jeannoticeras jeannoti (Fig. 3H) were found in Beds 218 and 214, representing probably the upper part (e.g. the Jeannoticeras jeannoti Subzone) of the Crioceratites loryi Zone. Beds below this levels did not yield any significant ammonites, therefore the presence of the lower part of the zone can not be confirmed. No specimens attributed to the genus Lyticoceras were ...
Context 8
... 213 and 210 yielded single specimens of Subsaynella sayni, and S. mimica, respectively (Fig. 3J-I). From Bed 212 upsection, nu- merous Plesiospitidiscus specimens were found in the section, and the first ptychoceratids also appear. On this basis, beds up to 216 are assigned to the Subsaynella sayni and Plesiospitidiscus ligatus Zones, without drawing the boundary between them. Certain levels of the uppermost Hauterivian ...
Context 9
... sections. The ammonite data are presented herein, whereas the calcareous nannofossil results are after Fogarasi (in: F} ozy and Fogarasi, 2002). smooth to densely and coarsely ribbed forms (Fig. 4C, E), docu- mented already from France and Spain (e.g. Vermeulen 2002, Company pers. comm 2005. Subpulchellia didayana (Janssen and F} ozy 2005, pl. 2, fig. 3) is another typical element of the as- semblage. The Subpulchellia compressissima Zone is also charac- terised by numerous holcodiscids including Holcodiscus gastaldianus (Fig. 4M-N), H. nicklesi, and H. cf. perezianus (Fig. 4T). H. fallax (Janssen and F} ozy 2005, pl. 2, fig. 15) is restricted to the lower part of the zone whereas H. ...
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Citations
... (ii) Eastern Mediterranean sections: The late Berriasian to late Albian; Butkov and Polomec sections from Slovakian Carpathian Mountains (Vašíček and Michalík, 1986;Vašiček, 1994Vašiček, , 1997Vašíček et al., 1994), the early Berriasian to early Aptian Čermákova Záhrada section (Vašíček et al., 1994), the early Berriasian to early Albian Strážovce section (Vašíček et al., 1994), the early Berriasian to early Albian Brodno section (Vašíček et al., 1994). The Bersek section in the Gerecse Mountains of NW Hungary (late Valanginian to late Barremian; Fözy, 2004, 2005;Fözy and Janssen, 2009;Price et al., 2011), and the middle Berriasian to late Hauterivian Hárskút section (Bakony Mountains; Fözy et al., 2010). The early Berriasian to early Hauterivian Barlya section was recorded from the western Balkan Mountains in southwestern Bulgaria (Lakova et al., 1999(Lakova et al., , 2007, in addition to the early Berriasian to late Valanginian Lyalintsi, Rebro and Velinovo sections (Ivanova et al., 2008). ...
... The Lower Cretaceous succession (Fig. 2) is represented by the Bersek Marl and Lábatlan Sandstone formations (császár 1996). The major part of Bersek Quarry comprises the monotonous Bersek Marl Formation (Főzy & JAnssen 2008 ). The lower part, about 120 metres thick, is Val- ©2016 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany www.schweizerbart.de ...
Six cyrtocrinid species, of which two are new, are described from the Lower Cretaceous calcareous and argillaceous marls of the Gerecse Mountains (northern Hungary): Phyllocrinus stellaris, Phyllocrinus sabaudianus, Phyllocrinus chalupai, Phyllocrinus bersekensis sp. nov., Apsidocrinus doreckae sp. nov., and Lonchocrinus dumortieri. ForLonchocrinus dumortieri, previously only recorded from the Bajocian to the Oxfordian, it is the youngest occurrence. Except for P. chalupai and the two new species, which seem to be endemic to this region, the other species are widespread in Jurassic and Cretaceous Tethyan deposits of Europe. The fauna to which these forms belonged most probably lived in water depths greater than 200 metres and in the presence of weak currents.
... Th e fi rst preliminary stratigraphic and taxonomic conclusions were based upon am monite and nannoplankton studies (Főzy & Fogarasi 2002). Biostratigraphical results, mainly based on ammonites, were later updated by Főzy & Janssen (2009). ...
... (ii) Eastern Mediterranean sections: The late Berriasian to late Albian; Butkov and Polomec sections from Slovakian Carpathian Mountains (Vašíček and Michalík, 1986;Vašiček, 1994Vašiček, , 1997Vašíček et al., 1994), the early Berriasian to early Aptian Čermákova Záhrada section (Vašíček et al., 1994), the early Berriasian to early Albian Strážovce section (Vašíček et al., 1994), the early Berriasian to early Albian Brodno section (Vašíček et al., 1994). The Bersek section in the Gerecse Mountains of NW Hungary (late Valanginian to late Barremian; Fözy, 2004, 2005;Fözy and Janssen, 2009;Price et al., 2011), and the middle Berriasian to late Hauterivian Hárskút section (Bakony Mountains; Fözy et al., 2010). The early Berriasian to early Hauterivian Barlya section was recorded from the western Balkan Mountains in southwestern Bulgaria (Lakova et al., 1999(Lakova et al., , 2007, in addition to the early Berriasian to late Valanginian Lyalintsi, Rebro and Velinovo sections (Ivanova et al., 2008). ...
Investigations on different fossil groups in addition to isotopic,
paleomagnetic and geochemical analysis are combined to extract the Early
Cretaceous history of environmental changes, as displayed by the sea
level and climate changes. Results on biostratigraphy are integrated
with other dating methods as magnetostraigraphy, correlation and
cyclostratigraphy. The main investigation topics of the submitted
project within the above-described framework are the biostratigraphic
(Lukeneder and Aspmair, 2006, 2012), palaeoecological (Lukeneder, 2008,
2012), palaeobiogeographic, lithostratigraphic (Lukeneder, 2010, 2011),
cyclostratigraphic and magnetostratigraphic development of the Early
Cretaceous in the Puez area. The main sections occur in expanded
outcrops located on the southern margin of the Puez Plateau, within the
area of the Puez-Geisler Natural Park, in the northern part of the
Dolomites (South Tyrol, North Italy). The cephalopod, microfossil and
nannofossil faunas and floras from the marly limestones to marls here
indicates Hauterivian to Albian/Cenomanian age. Oxygen isotope values
from the Lower Cretaceous Puez Formation show a decreasing trend
throughout the log, from -1.5‰ in the Hauterivian to -4.5‰
in the Albian/Cenomanian. The decreasing values mirror an increasing
trend in palaeotemperatures from ~ 15-18°C in the Hauterivian up to
~25-30 °C in the Albian/Cenomanian. The trend probably indicates the
positive shift in temperature induced by the well known Mid Cretaceous
Ocean warming (e.g., Super-Greenhouse). The cooperative project (FWF
project P20018-N10; 22 international scientists): An integrative high
resolution project. Macro- and microfossils, isotopes, litho-, cyclo-,
magneto-and biostratigraphy as tools for investigating the Lower
Cretaceous within the Dolomites (Southern Alps, Northern Italy) -The
Puez area as a new key region of the Tethyan Realm), is on the way since
2008 by the Natural History Museum in Vienna and the 'Naturmuseum
Südtirol' in Bozen, Southern Tyrol. Producing major results with a
broad impact requires using tools such as facies analysis supported by
lithological, sedimentological and chemical characteristics, isotope and
magnetic properties as well as fossil record (ammonites, belemnites,
brachiopods, echinoids, planktonic foraminiferas, radiolarians,
nannofossils, calcareous dinoflagellates, calpionellids). Foraminiferal
study provides the zonal subdivision of the Puez section from
Valanginian - Hauterivian gorbachikellids and praehedbergelids
(Hedbergella semielongata Zone), Barremo-Aptian praehedbergelids
(Blesusciana kuznetzove Zone), Aptian hedbergellids of occulta - aptiana
- praetrocoidea group, Early Late Aptian pseudo-planispiral foraminifera
(Praehedbergella luterbacheri and Globigerinelloides ferreolensis
Zones), important marker species of Hedbergella trocoidea and
Paraticinella bejaaouaensis for the Late Aptian zone, Early Albian
microperforate hedbergellids (Hedbergella planispira Zone), Mid Albian
ticinellids (Ticinella primula Zone), advanced ticinellids like
Ticinella roberti etc. (Biticinella breggiensis Zone), Latest Albian
rotalliporids (Rotalipora appeninica Zone) up to Early Cenonanian
appearance of Thalmanninella (Rotalipora) globotruncanoides. Results of
this integrated study will be used for both, the precise biostratigraphy
of the sequence studied as well as for the paleoenvironmental
reconstruction. Lukeneder A. 2012. New biostratigraphic data on an
Upper Hauterivian-Upper Barremian ammonite assemblage from the Dolomites
(Southern Alps, Italy). Cretaceous Research.
doi:10.1016/j.cretres.2011.11.002 Lukeneder A. 2011. The Biancone and
Rosso Ammonitico facies of the northern Trento Plateau (Dolomites,
Southern Alps; Italy). Annalen des Naturhistorischen Museum Wien, Serie
A, 112, 9-33. Lukeneder A. 2010. Lithostratigraphic definition and
stratotype for the Puez Formation: formalisation of the Lower Cretaceous
in the Dolomites (S. Tyrol, Italy). Austrian Journals of Earth Sciences,
103/1, 138-158. Lukeneder A. 2008. The ecological significance of
solitary coral and bivalve epibionts on Lower Cretaceous
(Valanginian-Aptian) ammonoids from the Italian Dolomites. Acta
Geologica Polonica, 58/4, 425-436. Lukeneder, A., Aspmair, C. 2006.
Startigraphic implication of a new Lower Cretaceous ammonoid fauna from
the Puez area (Valanginaian - Aptian, Dolomites, Southern Alps, Italy).
Geo.Alp, 3, 55-91.
... The largest part of the collected fauna comprises more than 10,000 ammonites which now provides a precise biostratigraphic control (e.g. Főzy and Fogarasi, 2002;Főzy and Janssen, 2009) but it also contains belemnites and benthic fossils, such as bivalves, brachiopods, solitary corals and trace fossils. These biostratigraphic studies build upon the earlier ammonite biostratigraphic data of Nagy (1967Nagy ( , 1968Nagy ( , 1969. ...
... The lower part is Valanginian in age, and is very poor in megafossils, whereas the upper~15 m of the marl is relatively rich in cephalopods. This part of the succession is purplish in colour, composed of calcareous and argillaceous bed couplets and represents the Hauterivian (Fϋlöp, 1958;Főzy and Fogarasi, 2002;Főzy and Janssen, 2009). These sediments were deposited on a mud and silt-dominated submarine slope (Fogarasi, 1995). ...
... The belemnite samples have been derived from five sections within the quarry. The location of each sample and section with respect to ammonite zones and lithology was clarified by Főzy and Janssen (2009). Sections A, B, C and D are located within 20 m of each other. ...
A high resolution stable isotope study of Upper Valanginian-Barremian (Early Cretaceous) belemnites from Bersek Quarry (Gerecse Mountains, Transdanubian Range, Hungary) is presented. Over 190 belemnite rostra (including Hibolithes subfusiformis, Duvalia dilatata and Conohibolites gladiiformis) have been analysed for oxygen and carbon isotopes and for trace element geochemistry. The obtained carbon isotope curve shows a long term decrease from similar to 1.2% in the Upper Valanginian to similar to-0.5% in the Upper Hauterivian followed by more variable values in the Early Barremian. Superimposed on this trend are a number of possible shorter term peaks. This pattern broadly follows published carbon isotope curves for the same interval and is therefore thought to reflect a global rather than a regional signal. The oxygen isotopes show the most positive values in the uppermost Valanginian and become increasingly more negative through the Hauterivian into the Barremian. Such changes are interpreted as an increase in marine temperatures through the section. The Mg/Ca data paralleling the oxygen isotope trend confirms our temperature interpretation. The oxygen isotope ratios are generally more negative and therefore allow us to infer warmer temperatures, than those derived from belemnites from time equivalent sections in Germany and Speeton, UK, consistent with the more southerly latitudinal position of the Gerecse Mts. within the Tethys Ocean. The oxygen isotope and Mg/Ca data also reveal habitat differences for the different belemnite groups analysed. Vaunagites pistilliformis, "Belemnites" pistilliformis and Hibolithes typically have more negative oxygen isotope values than Pseudobelus and Duvalia and are therefore interpreted to have lived in warmer and/or shallower parts of the water column, consistent with previous interpretations.
... (ii) Eastern Mediterranean sections: The late Berriasian to late Albian; Butkov and Polomec sections from Slovakian Carpathian Mountains (Vašíček and Michalík, 1986;Vašiček, 1994Vašiček, , 1997Vašíček et al., 1994), the early Berriasian to early Aptian Čermákova Záhrada section (Vašíček et al., 1994), the early Berriasian to early Albian Strážovce section (Vašíček et al., 1994), the early Berriasian to early Albian Brodno section (Vašíček et al., 1994). The Bersek section in the Gerecse Mountains of NW Hungary (late Valanginian to late Barremian; Fözy, 2004, 2005;Fözy and Janssen, 2009;Price et al., 2011), and the middle Berriasian to late Hauterivian Hárskút section (Bakony Mountains; Fözy et al., 2010). The early Berriasian to early Hauterivian Barlya section was recorded from the western Balkan Mountains in southwestern Bulgaria (Lakova et al., 1999(Lakova et al., , 2007, in addition to the early Berriasian to late Valanginian Lyalintsi, Rebro and Velinovo sections (Ivanova et al., 2008). ...
Investigations on different fossil groups within fields of isotopic,
magneto- and cyclo-stratigraphic and geochemical analysis are combined
to extract the Early Cretaceous history of environmental changes as
displayed by the sea level and climate. This results in calibrating
ammonite biostratigraphy and magnetostratigraphy through isotope data.
The main investigation topics of the submitted project within the
above-described framework are the biostratigraphic, palaeoecological,
palaeobiogeographic, lithostratigraphic, cyclostratigraphic and
magnetostratigraphic development of the Early Cretaceous of the Puez
area. The main locality within the project is located in huge outcrops
located at the southern margin of the Puez Plateau. It is located within
the area of the Puez-Geisler Nature park in the northern part of the
Dolomites (Trentino-Alto Adige; South Tyrol). Lower Cretaceous ammonoids
(n = 640) were collected at the Puez locality in the Dolomites of
Southern Tyrol (Lukeneder and Aspmair 2006). The cephalopod fauna from
the marly limestones to marls here indicates Late Valanginian to Late
Albian age. The underlying Biancone Formation (Maiolica Formation) is of
Early to Late Valanginian. The ammonoid fauna comprises 48 different
genera, each apparently represented by one to three species. The
complete occurrence at the Puez section is dominated by the
Phylloceratina (30%) and the Ammonitina (34%). Phyllopachyceras (17%)
and Phylloceras (13%) from the Phylloceratina are the most frequent
components, followed by Lytoceras (12%) from the Lytoceratina, and
Barremites (10%) and Melchiorites (8%) from the Ammonitina. The
following index ammonites could be detected so far: the latest
Valanginian Criosarasinella furcillata (C. furcillata Zone and Subzone),
for the middle Early Hauterivian Olcostephanus (Jeannoticeras) jeannoti
(O.(J.) jeannoti Subzone), and Toxancyloceras vandenheckii for the early
Late Barremian (T. vandenheckii Zone). The ammonoid fauna contains only
descendants of the Mediterranean Province (Tethyan Realm). Most
affinities of the cephalopod fauna are observed with faunas from the
adjacent areas of Italy (Lessini Mountains, Belluno, southern Trento
Plateau), the Northern Calcareous Alps and the Bakony, Geresce and
Mecsek Mountains of Hungary. This is explained by the neighbouring
position of the latter areas during the Early Cretaceous on the
Apulian/Adria block and the Alpine-Carpathian microplate. Lower
Cretaceous (Valanginian-Albian) deposits of the Puez locality in yield
remarkable amounts of specimens of different ammonoid taxa showing
unique epifaunal encrustations by the scleractinian, ahermatypic
solitary coral ?Cycloseris Lamarck, 1801 (Lukeneder 2008). The pattern
of infestation clearly documents a preference of the adherent taxa for
the outer shell surface of the ammonoids, whereas the inner surface
remains barren. The exact stratigraphically dating of the ammonoid fauna
allows synchronously to clear the age of the infested corals and the
autecological history of this new ammonid/coral palaeocommunity. The
symbiotic ammonoid-coral relation from the Dolomites exists from the
Valanginian to Albian times. The cooperative project (FWF project
P20018-N10; 22 international scientists): An integrative high resolution
project. Macro- and microfossils, isotopes, litho-, cyclo-, magneto-and
biostratigraphy as tools for investigating the Lower Cretaceous within
the Dolomites (Southern Alps, Northern Italy) -The Puez area as a new
key region of the Tethyan Realm), is on the way since 2008 by the
Natural History Museum in Vienna and the Southern Tyrol
‘Naturmuseum Südtirol' in Bozen. Producing major results with
a broad impact requires using tools such as isotopes,
magnetostratigraphy, cyclostratigraphy along with specific macrofossil
groups like ammonites, belemnites, brachiopods, microfossil groups like
radiolarians and foraminiferans, as well as nannofossils. This
combination will provide a picture of the Lower Cretaceous sea level
changes, allow conclusions to be drawn on palaeoclimate and yield
results on the biostratigraphic age coupled with more stable, exact ages
resulting from the well-established techniques of magnetostratigraphy.
Lukeneder A. 2008. The ecological significance of solitary coral and
bivalve epibionts on Lower Cretaceous (Valanginian-Aptian) ammonoids
from the Italian Dolomites. Acta Geologica Polonica, 58/4, 425-436.
Lukeneder, A., Aspmair, C. 2006. Startigraphic implication of a new
Lower Cretaceous ammonoid fauna from the Puez area (Valanginaian -
Aptian, Dolomites, Southern Alps, Italy). Geo.Alp, 3,55-91.
... (ii) Eastern Mediterranean sections: The late Berriasian to late Albian; Butkov and Polomec sections from Slovakian Carpathian Mountains (Vašíček and Michalík, 1986;Vašiček, 1994Vašiček, , 1997Vašíček et al., 1994), the early Berriasian to early Aptian Čermákova Záhrada section (Vašíček et al., 1994), the early Berriasian to early Albian Strážovce section (Vašíček et al., 1994), the early Berriasian to early Albian Brodno section (Vašíček et al., 1994). The Bersek section in the Gerecse Mountains of NW Hungary (late Valanginian to late Barremian; Fözy, 2004, 2005;Fözy and Janssen, 2009;Price et al., 2011), and the middle Berriasian to late Hauterivian Hárskút section (Bakony Mountains; Fözy et al., 2010). The early Berriasian to early Hauterivian Barlya section was recorded from the western Balkan Mountains in southwestern Bulgaria (Lakova et al., 1999(Lakova et al., , 2007, in addition to the early Berriasian to late Valanginian Lyalintsi, Rebro and Velinovo sections (Ivanova et al., 2008). ...
Although pelagic to hemipelagic Lower Cretaceous sediments only cover restricted areas in the Dolomites (Southern Alps, Italy), they form a significant element of the mountainous areas of the higher Dolomites. Unfortunately, many of the formations within this area lack a precise definition (type section and detailed lithostratigraphic log). Here, a stratotype for the newly formalised Puez Formation is fixed in the Puez area (Col de Puez) near Wolkenstein (S. Tyrol) at E 011°49′15″, N 46°35′30″. The Puez Formation (approx. 121 m thick) is subdivided into three members from Valanginian to Albian age: the Puez Limestone Member (approx. 50 m; marly limestones; Late Valanginian-Late Barremian), the Puez Redbed Member (approx 9 m; foraminiferal wackestone-packstones; Aptian) and the Puez Marl Member (approx. 57 m; marl to limestone alternations; Early Aptian-Late Albian). The newly formalised Puez Formation sheds light on the Lower Cretaceous tectonic history of the Dolomites, and allows the paleoenvironmental evolution of basins and plateaus to be better understood, as well as the faunal composition and distribution within the investigated interval.
A fairly preserved ammonite of Early Cretaceous age from the Mecsek Mountains, southern Hungary is described. Tescheni-ceras subpachydicranum is the first record of late Valanginian ammonites from the Mecsek tectonic zone from a previously unknown locality indicating the uppermost Valanginian Criosarasinella furcillata Zone. This is the first ammonite-supported evidence for the presence of upper Valanginian strata in the Mecsek Mountains that stretches the time-span of the continuous basinal sedimentation from the beginning of the Berriasian till the Valanginian. The new finding raises the possibility for the presence of the Hauterivian strata too, which was never recognised by ammonites.
Based on thorough taxonomic work with more than 10,000 rostra from the famous Štramberk locality (Northern Moravia, Czech Republic), belemnites were classified at the generic and species levels. The following genera have been recorded within this study: Berriasibelus, Duvalia, Pseudobelus, Hibolites and Conohibolites, including 23 species. A systematic and stratigraphic framework for sedimentary history has been used for important stratigraphical, palaeobiogeographical and geological interpretations. An unusual and extremely high diversity of belemnites within the sedimentary infills in the limestone crevasses has been explained by processes of multiple belemnite rostra being reworked from older sediments. Belemnite assemblages known from other areas within the North Western Tethys were compared with our material and used for detailed stratigraphical determination. The stratigraphic distribution of the studied belemnites ranges from the ?latest Tithonian/Berriasian to Valanginian, ?Hauterivian and newly Barremian. Although the palaeogeographical position of the Štramberk block is not known, the belemnite fauna biogeographically belongs to the Mediterranean Province. Since the Hauterivian, we refer this fauna to the French–Bulgarian Subprovince. The closest similarity of the Štramberk belemnite fauna is to those from France and Bulgaria and is therefore of high palaeobiogeographic value. No Boreal and/or Subboreal influences within belemnites were observed. The belemnite occurrences have also been investigated in the bathymetric/facies context and compared to published data from various Tethyan areas.
A Barremian hemipelagic succession from Ra Stua in the Dolomites (Southern Alps, northern Italy) is investigated stratigraphically. A short Barremian section was studied with regard to biostratigrapy, lithology, chemostratigraphy and geophysics and subsequently compared to known isochronic palaeomagnetic data and sea levels changes. The results are linked to magnetostratigraphic datasets of the same depositional area on the Trento plateau, yielding a detailed and robust age calibration of the Ra Stua succession. The Lower Cretaceous Ra Stua Formation in the Dolomites is assigned as lower Barremian (Taveraidiscus hugii Zone) to lower upper Barremian (Toxancyloceras vandenheckii Zone). Ammonoids enable a first biostratigraphic subdivision for that puzzling section at Ra Stua. This forms the basis for analyses of the faunal distribution and the palaeoenvironmental evolution of the northerneastern Trento Plateau on the western edge of the Cretaceous Tethys. The Ra Stua section is an enigmatic jigsaw piece correlatable to the Barremian of the entirely preserved sections in the Puez area. The succession consists of marlstones to marly limestone alternations of the Lower Cretaceous. These deposits cover only restricted areas in the Dolomites, but the facies type appears isochronically over wide areas in the Tethys. Lower Cretaceous successions from the Ra Stua area are known, but this isolated block is studied in detail for the first time. The Puez Formation occurs at the Ra Stua section with the Puez-Limestone Member, known as the lowermost member at the type section in the Puez area.
