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98 ADVANCES IN PALAEOICHTHYOLOGY Thompson K.S. 1980. The ecology of Devonian lobe-finned fishes. In: A. L. Panchen (ed.) The Terrestrial Environment and the Origin of Land Vertebrates. Systematics Association Special Volume 15, Academic Press, London-New York, pp. 187-222. Tolstikhina M.M. 1952. Devonian Deposits of the Central Part of the Russian Platform and the Development of its Basement During Palaeozoic. Moscow: Gosgeolizdat, pp. 3-119 (in Russian). Young G.C. 1993. Middle Palaeozoic macrovertebrate biostratigraphy of Eastern Gondwana. In: Long, J.A. (ed.) Palaeozoic Vertebrate biostratigraphy and biogeography. London, Belhaven Press, pp. 174-207. Zhu M., Ahlberg P.E., Zhao W., Jia L. 2002. First Devonian tetrapod from Asia. Nature, 420: 760-761. Jauna tetrapodu suga Jakubsonia livnensis no Krievijas agrā Famenas laikmeta (devons) un piezīmes par vēlā devona tetrapodu paleoekoloģiju OĻEGS ĻEBEDJEVS Aprakstītas agrīnā tetrapoda Jakubsonia livnensis gen. et sp. nov. skeleta atliekas no Gornostajevkas karjera (DR no Livniem, Orlas apgabals, Krievija), kur atsedzas augšējā devona Famenas stāva apakšējās daļas nogulumi. Sniegts galvaskausa virsējās daļas, nepilnīga stūra kaula, labās puses kleitruma ar skapulokorakoīdu un augšstilba apraksts. Jaunā ģints demonstrē starporbītu daļas un kleitruma uzbūves pazīmes, kas liecina par līdzību ar Ventastega Ahlberg, Lukševičs et Lebedev, 1994. Agrīno tetrapodu atradņu analīze parāda, ka šie dzīvnieki mituši dažādos ūdens vides biotopos. Antiarhu ģints Remigolepis spēlēja nozīmīgu lomu Famenas mugurkaulnieku asociācijās. Vairāk kā viena tetrapodu suga asociācijā norāda uz daudz plašākām tetrapodu trofiskām adaptācijām, nekā lēsts iepriekš.
ACTA UNIVERSITATIS LATVIENSIS, 2004, Vol. 679, pp. 99-119 Sedimentology, fauna, and taphonomy of the Pavāri site, Late Devonian of Latvia ERVINS LUKšEVIČS and IVARS ZUPIŅš E. Lukševičs, Department of Geology, University of Latvia, Rainis Blvd 19, Riga LV-1586, Latvia, Ervins.Luksevics@lu.lv; I. Zupiņš, Natural History Museum of Latvia, K. Barona Str. 4, Riga LV-1712, Latvia, Ivars.Zupins@dabasmuzejs.gov.lv The distribution, sorting, orientation, state of preservation, and wearing of vertebrate remains from the upper Famennian (Upper Devonian) Ketleri Formation of the Pavāri site, western Latvia, have been studied. The vertebrate fauna is dominated by the placoderm, Bothriolepis ciecere, and includes also acanthodians, several sarcopterygian taxa and the primitive tetrapod Ventastega curonica. Taxonomic composition, pattern of distribution, sorting, preferred orientation of vertebrate remains suggest that the assemblage was winnowed by water transport in a low concentration flow. Nevertheless, an almost total lack of wearing and the high degree of preservation, including many articulated skeletal parts, indicate short transportation of the remains before burial. An almost autochtonous character of the oryctocoenosis is, therefore, suggested. Sedimentological and taphonomic studies of the locality suggest that it was formed in relatively shallow sea conditions dominated by stream and weak wave influence, probably representing a low-tidal near-shore depositional environment. Most likely, vertebrates from the Ketleri Formation dwelled in a marine coastal environment, although the possibility that the remains have been transported for a considerable distance can not be excluded. Key words: Palaeoecology, placoderms, sarcopterygians, tetrapods, Famennian. Introduction The environmental conditions in habitats of early tetrapods and the palaeoecological aspects of the origin of tetrapods are still disputable problems of vertebrate evolution (Thomson 1980; Spjeldnæs 1982; Bendix-Almgren et al. 1990; Coates and Clack 1995; Lebedev, this volume). Studies on taphonomy in fossil vertebrate sites using both sedimentological and bionomic data is one of the methods that can provide some clues to the problem. This study concerns the sedimentological, environmental and taphonomic context of the locality known as the Pavāri (or Ciecere) site in western Latvia. This is one of the well-known sites where the primitive tetrapod Ventastega curonica has been found together with abundant fish remains in a sandstone of the upper Famennian (Upper Devonian) Ketleri Formation. The stratigraphy and fossils of the Ketleri Formation have attracted the interest of geologists and palaeontologists for more than 70 years (Gross 1942; Lyarskaya and Savvaitova 1974; Vorobyeva 1962, 1975; Lukševičs 1992; Lebedev and Lukševičs 1996). This interest has grown significantly in recent years after the discovery of the first tetrapod fossils from the Ketleri Formation (Ahlberg, Lukševičs and Lebedev 1994; Ahlberg and Lukševičs 1998; Lukševičs, Ahlberg and Clack 2003). Vertebrate fossils
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LATVIJAS UNIVERSITĀTES RAKSTI 679.
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LATVIJAS UNIVERSITĀTES RAKSTI 679.
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Contents Ervīns Lukševičs and Ģ
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ACTA UNIVERSITATIS LATVIENSIS, 2004
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Ervīns Lukševičs, Ģirts Stinkul
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Olga Afanassieva. Microrelief on th
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D.K. Elliott, E. Mark-Kurik, E.B. D
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Page 47 and 48: C.G.Miller, T. Marss, H. Blom. New
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Page 59 and 60: H.-P. Schultze, T. Marss. Revisitin
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Page 81 and 82: O.A. Lebedev. A new tetrapod from R
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Page 101 and 102: E. Lukševičs, I. Zupiņš. Sedime
Page 121 and 122: J. Valiukevičius. Silurian acantho
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V. Pernegre, V. Dupret. Biostratigr
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Ž. Žigaite. New telodont from Tuv
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