Temat: fluvial sandstone - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Interconnected chambered trace fossils, Pliocene lower Tipam Formation, Tripura, India
Autorzy:: Rajkumar, Hemanta, S.
Šimo, Vladimir
Powiązania:: https://bibliotekanauki.pl/articles/1836267.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: chambers
termite nest
boxwork
burrows
fluvial sandstone
Pliocene
Opis:: A new kind of trace fossil characterized by filled ellipsoidal chambers interconnected by a boxwork of burrows, shafts and tunnels, in different horizontal planes, is observed in the medium-grained fluvial sandstone of the Pliocene Lower Tipam Formation in the Amarpur area of Tripura in northeast India. The chambers have variable dimensions with lengths of 3-16 cm, widths of 3-10 cm and heights of 2-6 cm. Diameters of the connecting tunnels and shafts are 0.8-0.9 cm on average. The traces are considered to be nest systems of social insects. The discovery is noteworthy as far as the geology of Tripura state is concerned, as such chambered traces have not previously been reported from the Indian sub-continent. Morphology of the studied specimens point toward a new ichnospecies, Vondrichnus amarpurensis isp. nov. of the ichnofamily Krausichnidae.
Źródło:: Annales Societatis Geologorum Poloniae; 2020, 90, 3; 261-270
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Lithofacies and palaeoenvironmental interpretation of the Early Jurassic Höör Sandstone, Southern Sweden
Autorzy:: Pieńkowski, G.
Powiązania:: https://bibliotekanauki.pl/articles/2059898.pdf
Data publikacji:: 2002
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Höör Sandstone (Fm)
Early Liassic
Stanstorp Member
Vittseröd Member
sedimentology
fluvial lithofacies
storm- and tide-dominated facies
formal lithostratigraphy
Opis:: Sedimentological analysis of the Early Jurassic Höör Sandstone in Central Scania, Sweden shows that two units representing different lithofacies may be distinguished. The lower Stanstorp Member is characterised by texturally and mineralogically heterogeneous sediments. Mature arenites and immature quartz and subarkosic wackes form two clearly separated groups, interpreted as fluvial channel and alluvial plain deposits respectively. The fluvial character of this member is supported by a dominance of unidirectionally oriented trough sets, abundant plant detritus, the presence of plant roots and palaeosols and a lack of marine body fossils and trace fossils. An intercalated composite polymict conglomerate layer is interpreted as the result of an extraordinary flood. The overlying Vittseröd Member is characterised by mature quartz arenites and large-scale tabular sets with multidirectional orientations. The Vittseröd Member arenites are of storm- and possibly tide-dominated shoreface origin. Bidirectional wave and tide-induced longshore currents and unidirectional onshore migration of sand ridges were the chief depositional processes. Longshore currents towards the NNW prevailed. Upper flow regime features, and erosion and reworking of sediments are attributed to the storm-induced rip currents. Lithofacies characteristics are used to define the following lithostratigraphical units: the Stanstorp and the Vittseröd members, as well as the Höör Sandstone (Fm) above. Lithofacies and palaeoenvironmental characteristics of the Vittseröd Member and their comparison with the facies of the Helsingborg and Döshult members in Western Scania suggest a Sinemurian age for the Vittseröd Member.
Źródło:: Geological Quarterly; 2002, 46, 3; 307-320
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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