Konodonty z ordowickich głazow narzutowych Polski

• Autorzy: Wolska Z.

Warianty tytułu

EN

Condonts from ordovician erratic boulders of Poland

RU

Konodonty iz ordovikskikh valunov Pol'shi

• Języki publikacji: PL

Abstrakty

PL

Praca poświęcona jest konodontom ordowickim, wypreparowanym za pomocą kwasu octowego z wapiennych głazów narzutowych wieku ordowickiego. W materiale obejmującym około 800 okazów, 497 nadawało się do bliższego oznaczenia. Wyróżniono 33 formy, z których 21 można było dokładnie oznaczyć gatunkowo, pozostałe - w przybliżeniu. Najliczniejsze są gatunki występujące w Szwecji, w ordowiku dolnym, lecz są też takie, których zasięg stratygraficzny jest znacznie szerszy.

EN

The specimens of conodonts here described came into the writer’s possession through the courtesy of Prof. R. Kozłowski (Institute of Palaeozoology of Polish Academy of Sciences, Warsaw). They have been etched out of Ordovician erratic boulders from the vicinity of Warsaw (Mochty and Zakroczym). A part of the material has been collected by the writer personally in the vicinity of Poznań (Czerwonak and Oborniki Wielkopolskie). The warmest thanks are due to Dr. M. Lindström of the Lund University for the literature presented to the writer, the samples of Ordovician rocks sent to her from Sweden, and for the verification of the taxonomic determinations; also to Dr. W. C. Sweet of the Columbus University, U.S.A., for reprints of his papers and a number of conodont specimens. Though Pander’s monograph on conodonts was published as far back as 1856, no attempt has thus far been made in Poland to investigate these microfossils. The conodonts here described were etched out of 9 limestone boulders by treatment in a 15% solution of acetic acid. The drawings were done with the help of Abbe's apparatus. 33 erratic boulders from the vicinity of Poznań have been dissolved by the writer, but only five of them, mentioned here below, yielded conodonts in some abundance: Boulder O.383 from Oborniki (prov. of Poznań); 0.3 kg in weight, grey Endoceras limestone, finely crystalline, with abundant organic detritus. O.384, from Oborniki; 0.2 kg in weight, light-grey compact Orthoceras limestone. O.385, from Oborniki; 0.2 kg in weight, grey compact Orthoceras limestone, with occasional glauconite. O.386, from Czerwonak (prov. of Poznań); 0.2 kg in weight, compact glauconitic limestone; the grey-greenish colouration of the rock is due to the strong concentration of glauconite grains; pyrite occurs occasionally. O.387, from Czerwonak; 0.2 kg in weight, light-grey limestone with large admixture of glauconite and numerous plates of crinoids. The four erratics, from which conodont specimens have been etched out by Professor Kozłowski, are as follows: O.202, from Zakroczym (prov. of Warsaw); 0.84 kg in weight, coarse-grained organogenic limestone consisting of silicified fragments of Corallaria, Bryozoa, Brachiopoda, and Tasmanites sp., Scolecodonta, Eurypterida. O.211, from Zakroczym; 1.26 kg in weight, light-grey, fine-grained organogenic limestone with Conotreta sp. and Mastigograptus sp. O.219, from Zakroczym; 0.66 kg in weight, light-grey, fine-grained organogenic limestone, with indeterminable fragments of Didymograptidae. O.241, from Mochty (prov. of Warsaw); 1.01 kg in weight, light-grey, fine-grained organogenic limestone. The orientation and terminology followed by the writer are those used by Lindström (1954, p. 521) as may be seen from that author’s diagrams reproduced in the present paper. The material here considered consists of about 800 specimens, many of which are fragmentary. 497 specimens have been specifically identified. The colouration of the specimens is light-amber, transparent or opaque, occasionally whitish. The intensity of colour depends on the extent of fossilization and all grades of hues are observable in different specimens of the same species. The conodont specimens occur in variable abundance: they are absent in the majority of Polish erratics, one or two specimens only have been yielded by some boulders, while others may contain a dozen or more specimens. In association with cephalopods, conodonts occur more abundantly, in coral rocks they are less common or even completely lacking. All the conodont specimens here considered display a laminated structure. As is evident from table 1 (see p. 342-3 of the Polish text), the stratigraphic distribution of conodont species has been very incompletely studied, particularly so in regard to Europe. The excellent descriptions of conodont faunas, so far published, deal almost exclusively with particular stages. In view of these inadequacies the specification list of the conodont fauna and iits range within the Ordovician call for much supplementary evidence. 33 species of conodonts, belonging to 17 genera, have been described in the present paper. The predominant forms are those with the habitus of single cones; they make up 59 per cent of the whole studied material. On the evidence of conodont specimens the age of erratics 0.385, 0.386 and 0.387 may reasonably be determined as Lower Ordovician (Arenigian) since their conodont fauna Very closely resembles that described by Lindstrom (1960) from the Arenigian Bilingen stage and the Limbata Limestone in the island of Öland. Erratics O.211, O.219, O.241, O.383 and O.384 are probably of Middle Ordovician age. The composition of their conodont fauna comes very near to the conodont assemblages described by Lindström (1960) from the Llandeilian (Schroeteri Limestone and Crassicauda Limestone), and the Caradocian (Ludibundus Limestone) of the island of Öland. Erratics O.211, O.219, O.241, O.383 and O.384 are probably of Middle primus (Branson & Mehl) and Ozarkodina typica Branson & Mehl, thus far recorded from beds not older than Silurian in age. This boulder, however, has yielded specimens of genus Panderodus in relatively great abundance. Panderodus is on the whole an index form of moderate value, but its abundance would rather suggest the Upper Ordovician age of the boulder. The species here described have a wide geographic distribution being encountered both in Europe and in North America, too.

RU

Описано конодонты отпрепарированные из ордовикских известняковых валунов, собранных в окрестностях Варшавы (Мохты, Закрочим), а также из окрестностей Познани (Червонак и Оборники Велькопольске). Растворено в 15% уксусной кислоте 51 валунов, но только 9 содержало большее количество конодонтов. Отпрепарировано около 800 образцов. Сохранность их в общем хорошая. 497 образцов можно было определить по видам, относя их к 33 видам принадлежащим к 17-ти родам. Преобладают формы в виде единичных конусов, составляющие 59% собранных образцов. Валуны № O.385, O.386, O.387 по всем вероятиям нижне-ордовикского возраста (арениг). Фауна их конодонтов, по своему составу, близка конодонтовой фауне описанной из острова Эланд Линдстремом (Lindstrom, 1960) из Arenigian Billingen stage и Limbata Limestone. Валуны № O.211, O.219, O.241, O.383 и O.384 происходят по всей вероятности из среднего ордовика и состав их конодонтовой фауны приближается к комплексам конодонтов, описанных Линдстремом (1960) из острова Эланд из лландейло (Schroeteri Limestone и Crasicauda Limestone) и карадока (Ludibundus Limestone). Валун № O.202 по всем вероятиям верхне-ордовикского возраста. Описанные в настоящей заметке конодонты имеют широкое географическое распространение, так как встречаются не только в Европе, но тоже и в Северной Америке.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1961
• Tom: 06
• Numer: 4
• Opis fizyczny: p.339-365,fig.,ref.

Twórcy

autor

Wolska Z.

• Zakład Paleozoologii Polskiej Akademii Nauk, Oddział w Poznaniu, Poznan, Poland

Bibliografia

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