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Bathonian ammonites from the Polish Tatras

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Galacz A. , Matyja B.

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tom Vol. 4, no. 1

162-162

EN

In the sedimentary sequence of the Polish High Tatras, thin limestone beds with Middle Jurassic, mainly Bathonian fossils have been reported. The best known of these occurrences is that of Wielka Âwistówka Cirques in the Mi´tusia Valley with extremely rich ammonite fauna which became famous for the classic monographs of Passendorfer in 1935 and 1938. The fauna occurs in a condensed bed overlying with considerable hiatus the Middle Triassic shallow-water carbonates, and is covered by Upper Jurassic pelagic limestone. The 8-12 cm thick bed yielded nautiloids, belemnites, ammonites and brachiopods in great profusion, and less commonly other molluscs (bivalves and gastropods). The revision of the ammonite fauna in the collections of Passendorfer indicated that most of the forms is typical of the higher Middle Bathonian Bremeri Zone, with the rich representation of the zonal index and other diagnostic forms, e.g. Prohecticoceras ochraceum, Bullatimorphites eszterensis. Within the perisphinctids, Procerites is dominant and Wagnericeras is rarer which could indicate the lower part of the Bremeri Zone. As interesting rarities, Phlycticeras, Oecoptychius, Thraxites, etc. also appear. However, the collections contain some macrocephalitids and rare Hecticoceras suggesting the presence of the Lower Callovian. While preservational differences cannot be seen between the Bathonian and Callovian fossils, and the recent state of the Wielka Âwistówka exposure did not show this, the best explanation is to suppose an occurrence of a thin, intermittent Callovian layer in between the Bathonian and Upper Jurassic beds as the source of these stratigraphically younger ammonites in the collections. The ammonite fauna is dominated by suborder Ammonitina (66.6%) of which nearly half belongs to the Perisphinctidae, and phylloceratids are represented 32%. This is a faunal composition very close to those from other Bathonian condensed ammonite beds occurring in the Carpathian-Pannon region (e.g. Swinitza in the Southern Carpathians, Villány in South Hungary).

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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

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Wierzbowski A. , Matyja B.

Volumina Jurassica

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2014

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tom 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.

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Stratigraphy and microfacies of the Jurassic and lowermost Cretaceous of the Veliky Kamenets section (Pieniny Klippen Belt, Carpathians, Western Ukraine)

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Rehakova D. , Matyja B. , Wierzbowski A. , Schlogl J. , Krobicki M. , Barski M.

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2011

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tom Vol. 9, no. 1

61-104

EN

The Veliky Kamenets section in the eastern part of the Pieniny Klippen Belt in the Ukrainian Carpathians shows a well exposed, 83 m thick succession composed of Jurassic and lowermost Cretaceous (Berriasian) deposits. The terrigenous part of the section includes: gravels with a sandy matrix (unit 1A), massive grey-green sandstones (unit 1B) and shales with intercalations of siltstones/sandstones and oyster/gastropod lumachelles (unit 2). Organic-walled dinoflagellates document the Toarcian-Aalenian age of the siliciclastic deposits of unit 2. The carbonate part of the succession embraces: stromatactis mud-mounds interfingering with crinoidal limestones (unit 3A), lower nodular limestones (unit 3B), cherty limestones (unit 3C), upper nodular limestones (unit 3D), pink pelitic limestones (unit 3E), limestones with a volcanogenic bed (unit 5) and limestone breccia limestones (unit 6). This succession has yielded abundant ammonites from the Bathonian, Oxfordian and Kimmeridgian (with a stratigraphical hiatus covering the Callovian and Lower Oxfordian), as well as calcareous dinoflagellates (from the Upper Oxfordian towards the top of the succession), and calpionellids (in the Tithonian and Berriasian). Detailed stratigraphical study of the succession based both on ammonites and microfossils has resulted in the recognition of biostratigraphical units and their correlation with the chronostratigraphical scale.The microfacies recognized in the pelagic part of the succession include: the “filament” (Bositra) microfacies (Bathonian), the planktonic foraminifer microfacies (Oxfordian), the Saccocoma microfacies (Kimmeridgian to Upper Tithonian), and the calpionellid microfacies (Upper Tithonian–Berriasian). The volcanogenic rocks (lava flows and volcanic ash) appear in the topmost part of the succession (units 4 to 6) and this volcanic event is very precisely located in the Elliptica-Simplex chrons of the Middle and Late Berriasian.