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Ammonite biostratigraphy in the Polish Jura sections (central Poland) as a clue for recognition of the uniform base of the Kimmeridgian Stage

Wierzbowski A., Matyja B.

Volumina Jurassica

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2014

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Vol. 12, no. 1

45--98

EN

The ammonite succession in the stratigraphical interval from the Bifurcatus Zone, through the Hypselum Zone, up to the lower part of the Bimammatum Zone corresponding to a large part of the Submediterranean Upper Oxfordian is studied in several sections of the Polish Jura in central Poland. The sections have yielded numerous ammonites of Submediterranean–Mediterranean affinity, but also, some of Boreal and Subboreal character. The co-occurrence of ammonites of different bioprovinces makes possible the correlation between the different zonal schemes – especially between the Subboreal/Boreal zonations and the Submediterranean/Mediterranean zonation. The correlation shows that the boundary of the Pseudocordata and Baylei zones (Subboreal) and its equivalent – the boundary of the Rosenkrantzi and Bauhini zones (Boreal), currently proposed as the primary standard of the Oxfordian-Kimmeridgian boundary within its GSSP at Staffin Bay (Isle of Skye, Scotland), runs in the Submediterranean/Mediterranean Upper Oxfordian near the base of the Bimammatum Zone. This discovery removes the main obstacle against the formal recognition of the Staffin Bay section as representing the uniform base of the Kimmeridgian Stage in the World and its GSSP. The ammonite taxa recognized are commented on and/or described, and suggestions on their taxonomical and phylogenetical relations are given in the palaeontological part of the study. A new taxon is established: Microbiplices anglicus vieluniensis subsp. nov.

2

Boreal and Subborreal ammonites in the Submediterranean uppermost Oxfordian in the Bielawy section (northern Poland) and their correlation value

Matyja B., Wierzbowski A.

Acta Geologica Polonica

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2002

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Vol. 52, nr 4

411-421

EN

The youngest deposits exposed in the Bielawy Quarry (Kujawy area, northern Poland) yielded both Submediterranean ammonites, making possible recognition of the uppermost Submediterranean Oxfordian, and Subboreal-Boreal ammonites, indicative of some parts of the Subboreal/Boreal lowermost Kimmeridgian. This makes possible closer correlation of the different zonal schemes that appear to be important in discussion of the uniform Oxfordian/Kimmeridgian boundary and recognition of its GSSP. The upper part of the Submediterranean Planula Subzone yields Boreal Amoeboceras of the Plasmatites group, indicative of the Boreal Bauhini Zone. Moreover, the lowermost part of the Submediterranean Galar Subzone corresponding to the wenzeli horizon yields Boreal Amoeboceras of the Amoebites group (such as Amoeboceras bayi BIRKELUND & CALLOMON), indicative of the lowermost part of the Boreal Kitchini Zone, as well as late representatives of the genus Pictonia, described here as Pictonia kuiaviensis sp. nov., allowing correlation with the upper part of the Subboreal Baylei Zone.

3

Profil wiercenia Kcynia IG IV i jego znaczenie dla stratygrafii i paleogeografii oksfordu i dolnego kimerydu

Matyja B. A., Wierzbowski A.

Biuletyn Państwowego Instytutu Geologicznego

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1998

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nr 382

35-74

PL

Opracowanie paleontologiczne kolekcji amonitów oksfordu i dolnego kimerydu z wiercenia Kcynia IG IV z północnej Polski pozwoliło na zrewidowanie biostratygrafii występujących tu utworów i wydzielenie w całym profilu submedyterańskich poziomów i podpoziomów amonitowych. Oprócz obecnych w całym profilu amonitów submedyterańskich, ilościowe zestawienie przedstawicieli prowincji borealnej i subborealnej pozwoliło wykazać, że najsilniejsze wpływy tych prowincji rejestrują się w dolnej części poziomu Bimammatum i najwyższej części poziomu Hypselocyclum. Występowanie amonitów charakterystycznych dla różnych prowincji biogeograficznych w tych samych przedziałach profilu pozwoliło na wyróżnienie nowych powiązań korelacyjnych pomiędzy różnymi podziałami biostratygraficznymi: (1) dolna granica subborealnego poziomu Baylei, równoważna w podziale subborealnym dolnej granicy kimerydu, przebiega w obrębie wyższej części submedyterańskiego poziomu Bimammatum, (2) dolna granica subborealnego poziomu Mutabilis (sensu Birkelund i in., 1983) przebiega w obrębie najwyższej części submedyterańskiego poziomu Hypselocyclum. Analiza paleoekologiczna rozprzestrzenienia poszczególnych rodzin amonitów submedyterańskich w Polsce wskazuje, że w najwcześniejszym kimerydzie istniało bezpośrednie połączenie umożliwiające swobodne przemieszczanie amonitów pomiędzy północną Polska, a obszarami Jury Frankońskiej i Jury Szwabskiej poprzez obszary obecnie pozbawione osadów górnojurajskich.

EN

Palaeontological study of the ammonite collection of the Oxfordian and Lower Kimmeridgian in the Kcynia IG IV borehole in northern Poland has resulted in biostratigraphical revision of the succession and allowed the recognition of the Submediterranean Zones and Subzones. Although Submediterranean ammonites overdominate in the succession, Subboreal and Boreal ammonites increase proportionally in the lower Bimammatum Zone and the uppermost Hypselocyclum Zone reflecting significant ammonite invasions from the north. The co-occurrence of the ammonites indicative of different bioprovinces in the same intervals of the studied succession permits closer correlation of the zonal schemes. The new results of the correlation are as follows: (1) the lower boundary of the Baylei Zone of the Subboreal zonal scheme corresponding therein to the lower boundary of the Kimmeridgian lies within the upper part of the Submediterranean Bimammatum Zone, (2) the lower boundary of the Subboreal Mutabilis Zone (sensu Birkelund et al., 1983) lies within the uppermost part of the Submediterranean Hypselocyclum Zone. Palaeoecological analysis of the distribution of ammonites representing the particular Submediterranean families in Poland has shown that during the earliest Kimmeridgian there existed a direct marine connection between northern Poland and the Franconian and Swabian Albs enabling free migration of ammonites through the areas presently devoid of Upper Jurassic deposits.