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Ichnotaxonomy and trackmaker assignment of tetrapod tracks and swimming traces from the Middle Permian Hornburg Formation of Saxony-Anhalt (Germany)

100%

Buchwitz M. , Marchetti L. , Jansen M. , Falk D. , Trostheide F. , Schneider J. W.

Annales Societatis Geologorum Poloniae

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2020

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tom Vol. 90, No. 3

291--320

EN

Here we describe new material of tetrapod tracks and swimming traces from the Konberg quarry, a tracksite of the late middle Permian Hornburg Formation in Saxony-Anhalt, central Germany. A relatively well-preserved trackway and several isolated imprints are assigned to Capitosauroides isp. Among others, toe proportions in the manus and pes footprints of the newly described specimens and the long, proximal and detached pedal digit V imprint are similar to the type ichnospecies Capitosauroides bernburgensis from the Early Triassic of Bernburg, Saxony-Anhalt. In these features the new Konberg material differs from other ichnotaxa, such as Amphisauropus and Varanopus, which may look similar in their relative length of the sole, digit proportions and/or in the digit tip imprint morphology. The comparatively large manus imprint, which is wider than long, the relative length and shape of the sole impression, the digit proportions that are indicative for a more ectaxonic manus a more mesaxonic pes, the low pace angulation and the low imprint-size-normalized stride length in the Konberg track type are distinct from C. bernburgensis. It shares, however, a certain similarity with recently described material of Capitosauroides from middle-late Permian tracksites. These observations are in agreement with the results of a multivariate analysis including Capitosauroides and morphologically similar ichnotaxa. Our findings would justify the erection of a new ichnospecies if more trackways with a similar or slightly better preservation were at hand. Hornburg Formation material previously assigned to Amphisauropus is herein considered as indetermined tetrapod tracks, whereas the oc-currence of Dromopus isp. is confirmed. This reassignment shortens the stratigraphic range of the ichnogenus Amphisauropus,which appears to be restricted to the early Permian, since younger occurrences are questionable. In agreement with the attribution of Capitosauroides to eutheriodont producers, we regard the Konberg material assigned to this ichnogenus as tracks of small and possibly semi-aquatic therapsids. Abundant tetrapod swimming traces that co-occur with Capitosauroides isp. on the same bedding planes are interpreted as having been made by the same group of producers. The subaquatic traces often consist of short parallel claw mark sets. In agreement with a derived amniote producer group, they indicate propulsion by parasagittal limb movement rather than axial undulation.

2

Depositional environment and petrology of Rotliegend deposits from the Unisław-Wałdowo Królewskie region

84%

Buniak A. , Mikołajewski Z. , Protas A.

Geologos

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1999

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tom Vol. 4

5--27

EN

The Rotliegend deposits have been drilled in following boreholes: Unisław 2, Unisław 4, Unisław IG1, Unisław IG2 and Wałdowo Królewskie 1. In studied area these sediments constitue a differentiated lithological complex, being a product of varied depositional conditions, controlled mainly by tectonics and paleoclimatic factors. Two general facies associations: lacustrine and fluvial ones have been distinguished. Lacustrine facies is dominated by claystones, siltstones and fine sandstones originated in seasonally dried lake basin but fluvial sediments are represented by varigrained sandstones accumulated as channel and sheet flood deposits. Two phases of Rotliegend deposition were defined: the first one of a fluvial character and the second one with expansion of lacustrine facies. Evolution of porosity was controlled by cementation processes and low reservoir properties of lacustrine deposits are a consequence of their development and rich matrix content. Fluvial sediments are considered as a potential reservoir rock, with higher reservoir characteristics.

PL

Utwory czerwonego spągowca przewiercono w otworach wiertniczych Unisław 2, Unisław 4, Unisław IG1, Unisław IG2 oraz Wałdowo Królewskie 1. Na omawianym obszarze stanowią one zróżnicowany kompleks litofacjalny będący efektem zmiennych warunków depozycji, na które decydujący wpływ miały tektonika i warunki paleoklimatyczne. Opisano następujące zespoły facjalne: zespół osadów jeziornych i zespół osadów fluwialnych. Wśród osadów jeziornych dominują iłowce, mułowce i piaskowce drobnoziarniste powstałe w okresowo wysychającym zbiorniku jeziornym, natomiast osady fluwialne reprezentowane są przez różnoziarniste piaskowce powstałe w facjach korytowych oraz jako pozakorytowe zalewy warstwowe. Depozycja utworów czerwonego spągowca przebiegała w dwóch etapach. W pierwszym dominowała działalność fluwialna, w drugim etapie obserwujemy przekraczające występowanie osadów zbiornika jeziornego. Stwierdzono dominujący wpływ procesów cementacji w modelowaniu przestrzeni porowej. Niskie własności zbiornikowe osadów jeziornych związane są z ich wykształceniem oraz obecnością obfitego matriks. Osady fluwialne są potencjalną skałą zbiornikową, posiadają wyższe własności zbiornikowe.

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Archival gamma ray logs standardization by nondestructive core measurements of the low‑radioactivity rocks

84%

Skupio R. , Kubik B. , Wolański K.

Acta Geophysica

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2019

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tom Vol. 67, no. 6

1835--1844

EN

The present study analyzes spectral gamma ray data of low-radioactivity rock cores from Rotliegend Basin. The main goal of this research was standardization of archival gamma ray logs measured in counts per minute to American Petroleum Institute units. Selected core intervals, log data, and additional crushed samples covered three different boreholes: J-1, L-7, and K-2 from Zielona Góra Basin, localized in western Poland, where J-1 was a reference borehole. Core measurements were performed on the sandstone and conglomerate formations by Gamma Logger GT spectrometer, which uses two scintillation detectors containing bismuth germanate crystals. In the cores, real concentrations of potassium, uranium, and thorium were acquired what enabled to calculate total content of radioactive elements and total uninfluenced by uranium. Delivered new total GR_GLGT curve from cores allowed accurate standardization of archival GR curves from L-7 and K-2 boreholes. Presented results showed a very good correlation between logs, core data, and laboratory analyses. These data allow precise shale volume reinterpretation.

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Wyjaśnienie zmian przewodności hydraulicznej skał czerwonego spągowca w płd.-zach. części Monokliny Przedsudeckiej

84%

Herman Z.

Wiadomości Naftowe i Gazownicze

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2000

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tom R. 3, Nr 4 (24)

3-9