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1
Content available Unusual echinoid resting trace records change in the position of the redox boundary (Palaeogene of the Lesser Caucasus in Georgia)
Uchman Alfred, Lebanidze Zurab, Kobakhidze Nino, Beridze Tamar, Makadze Davit, Lobzhanidze Koba, Khutsishvili Sophio, Chagelishvili Rusudan, Koiava Kakha, Khundadze Nino
Acta Geologica Polonica
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2022
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Vol. 72, no. 3
317--330
EN
The first recognition of a tracemaker responding to a temporary shift in the redox boundary is recognized. This is recorded by a new trace fossil, Sursumichnus orbicularis igen. et isp. nov., which is established for mound-like structures on the upper surfaces of sandstone beds from the Borjomi Flysch (upper Paleocene–lower Eocene) in the Lesser Caucasus (Georgia). It is connected with the spatangoid echinoid burrow Scolicia de Quatrefages, 1849 and interpreted as a resting trace of the same tracemaker produced after moving up from a deeper position within the sediment. The resting is caused by an episode of unfavourable conditions related to shallowing of the redox boundary. The trace fossil is a component of the Nereites ichnofacies.
2
Content available A new etching trace from the Savignone Conglomerate (Oligocene), NW Italy, probably produced by limpet gastropods
Uchman A., Rattazzi B.
Acta Geologica Polonica
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2018
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Vol. 68, no. 4
651--662
EN
A new ichnogenus and ichnospecies (Solealites ovalis) of etching trace is preserved on the surfaces of clasts from the Savignone Conglomerate (Oligocene) in the Palaeogene Piemonte Basin in NW Italy. It is a shallow, oval depression with a central elevation, which was produced probably by limpet gastropods and served as their home scar, but other gastropods or even sea anemones are not excluded as the trace makers. The conglomerate is interpreted as a deposit of a fan delta, whose clasts have been bioeroded in an intertidal and shallow subtidal shore zone and redeposited to the deeper sea.
3
Content available The miniature echinoid trace fossil Bichordites kuzunensis isp. nov. from early Oligocene prodelta sediments of the Mezardere Formation, Gokceada Island, NW Turkey
Demircan H., Uchman A.
Acta Geologica Polonica
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2012
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Vol. 62, no. 2
205-215
EN
The pascichnial trace fossil Bichordites kuzunensis isp. nov. occurs as an epichnial complex structure in early Oligocene prodelta sediments of the Thrace Basin in Gokceada Island, northwest Turkey. It displays characteristics of irregular echinoid burrows such as overall shape and a double meniscate filling with a chevron dorsal suture, in addition to the feature typical of the so far monospecific Bichordites Plaziat and Mahmoudi, 1988, that is a single central core around a single drainage tube. Its miniature size can be related to the small size of the tracemaker (ontogenic feature) or to its dwarfism in a stressed deltaic environment (palaeoecological feature). Its occurrence indicates a period of fully marine conditions during accumulation of the deltaic sediments of the Mezardere Formation.
4
Content available remote Kiss of death of a hunting fish : trace fossil Osculichnus labialis igen. et isp. nov. from late Eocene - early Oligocene prodelta sediments of the Mezardere Formation, Thrace Basin, NW Turkey
Demircan H., Uchman A.
Acta Geologica Polonica
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2010
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Vol. 60, no. 1
29-38
EN
The trace fossil Osculichnus labialis igen. et isp. nov. occurs as hypichnial pairs of uneven bilobate mounds in early Oligocene prodelta sediments of the Thrace Basin. Osculichnus is generally elliptical or crescentic in outline and has two lip-like lobes: a smaller and a larger one, which are separated by an undulate furrow. Herein, it is interpreted as a hunting trace (praedichnion) of a fish penetrating a surficial sand layer and into an underlying mud horizon. The fish hunted for small endobenthic bivalves and perhaps other invertebrates such as polychaetes. Penetration into surficial mud rather than sand resulted in poorly preserved variants of this trace fossil, whose median furrow is commonly not visible. The probability of fish trace makers is supported by experiments.
5
Content available remote Ichnological record of the activity of Anthozoa in the early Cambrian succession of the Upper Silesian Block (southern Poland)
Pacześna J.
Acta Geologica Polonica
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2010
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Vol. 60, no. 1
93-103
EN
A new occurrence of inferred Anthozoa trace fossils from the Lower Cambrian subsurface succession of the Upper Silesian Block is discussed with respect to their ichnotaxonomical variation and some aspects of the palaeoecology. The three ichnogenera Bergaueria Prantl, 1945, Conichnus Mannil, 1966 and Conostichus Lesquereux, 1876 have been identified. A relatively diverse assemblage of actinian or cerianthid trace fossils allows recognition of habitats, feeding modes and life strategies of the tracemakers. An example of probable anthozoanpolychaete mutualism is suggested on the basis of the interrelationships of the trace fossils.
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