<i>Estrellichnus jacaensis</i>
            from the Eocene Jaca Basin of NE Spain: new locality and new ethological interpretation

Adserá, Pedro; Belaústegui, Zaín; Uchman, Alfred

doi:10.1111/let.12346

Cited by 3 publications

(2 citation statements)

References 46 publications

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“…The same holds for deep-sea turbiditic de pos its in the Julian Prealps (Tunis and Uchman, 1996a;Marinciae et al, 1996), Istria (Tu nis and Uchman, 1996b), the Hecho Group in the south ern Pyr e nees (Uchman, 2021), the Kulm de pos its in Moravia (Mikuláš et al, 2004) and other ar eas or for ma tions. Other ichnospecies of Megagrapton oc cur in turbidites in dis tal lobes (e.g., Adserá et al, 2020), overchannel (Buatois et al, 2001), interlobe, fan fringe (e.g., Cummings and Hodgson, 2011) and ba sin floor (e.g., Uchman, 2001) or slope apron fa cies (Demircan and Uchman, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…(Estarrún Val ley, near Eposa). For the ge ol ogy and ichnology of the Hecho Group see Uchman (2001), Heard and Pickering (2008) and Adserá et al (2020); -Kulm de pos its (Lower Car bon if er ous), Czech Re pub lic, spec i men F627 (N. Tìchanovice), housed in Olomouc Uni -ver sity, Czech Re pub lic. For the ge ol ogy and ichnology of the Kulm fa cies in the re gion see Mikuláš et al (2004).…”

Section: Megagrapton Aequalementioning

confidence: 99%

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Revision of the trace fossil Megagrapton Książkiewicz, 1968 with focus on Megagrapton aequale Seilacher, 1977 from the lower Eocene of the Lesser Caucasus in Georgia

Uchman

Lebanidze

Beridze

et al. 2022

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Megagrapton Książkiewicz, 1968 is a characteristic deep-sea trace fossil belonging to the group of graphoglyptids and mostly preserved as a network of irregular meshes in hypichnial semirelief. So far, eleven ichnospecies have been distinguished under this ichnogenus, though commonly on weak evidence. The so-far poorly known ichnospecies Megagrapton aequale Seilacher, 1977 is described here on the basis of the numerous, newly discovered specimens from deep-sea siliciclastic deposits of the Bolevani Subsuite (lower Eocene) in the Lesser Caucasus of Georgia, together with other collections and published examples. A neotype of this ichnospecies is designated and the diagnosis emended. M. aequale occurs in lower Cambrian to upper Miocene deep-sea turbiditic deposits, mostly in the Paleogene. It is characterized by relatively small, variable meshes, which have mostly irregular sub-pentagonal, sub-hexagonal or sub-heptagonal shapes that are variable in size and are bordered by curved or straight semicircular ridges. It has been mistaken for Paleodictyon, which forms regular hexagonal nets. Paleodictyon imperfectum Seilacher, 1977 is included in M. aequale as the ichnosubspecies M. a. imperfectum, which is characterized by relatively thin bordering ridges. After critical analysis of all ichnospecies, only M. irregulare Książkiewicz, 1968, M. submontanum (Azpeitia Moros, 1933), and M. aequale are recommended for further use. These are distinguished on the basis of the prevailing morphology of the meshes, irrespective of large differences in morphometric parameters within the ichnospecies. Irredictyon chaos Vialov, 1972 is included in M. irregulare as the ichnosubspecies M. i. chaos, which is characterized by relatively thick bordering ridges. Megagrapton is interpreted as a cast of a subsurface open burrow network with a few connections to the sea floor. The burrows probably functioned as a trap for small organisms (ethological subcategory irretichnia).

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Section: Discussionmentioning

confidence: 99%

Section: Megagrapton Aequalementioning

confidence: 99%

Revision of the trace fossil Megagrapton Książkiewicz, 1968 with focus on Megagrapton aequale Seilacher, 1977 from the lower Eocene of the Lesser Caucasus in Georgia

Uchman

Lebanidze

Beridze

et al. 2022

Self Cite

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Behavioural and Environmental Significance of the Rosetted trace Fossil Dactyloidites ottoi (Geinitz, 1849) from the Early Cretaceous (Berriasian) of Kachchh, Western India

Patel

Shitole

Darngawn

et al. 2023

Journal of the Geological Society of India

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For decades, naming the rosetted trace fossil species of Dactyloidites ottoi or Haentzschelinia ottoi has been a matter of discussion. The phobotactic behaviour of the trace makers reflecting systematic mining to form branched radial elements converging at the central vertical shafts in both the ichnogenera are similar and foreknown. Berriasian marine deltaic deposits of the Jhuran Formation, India, contain several such endichnial mid-tier traces of Dactyloidites ottoi (Geinitz, 1849), at six different levels in a highly bioturbated subarkosic bedded sandstone. Its occurrence is associated with Arenicolites, Ophiomorpha, Planolites and Rhizocorallium. The analysis of the trace fossils from the archives reveals the mining strategy resulting in Cambrian to Holocene Dactyloidites and Haentzschelinia traces. The present specimens of D. ottoi and the morphological variants within the traces also indicate an effect of the variations in palaeobiological and palaeoenvironmental aspects.

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Comparison of rosette-shape traces in abyssal terrains: Environmental and faunal implications

Miguez‐Salas¹,

Bett²,

Torres‐Montilla³

et al. 2023

Deep Sea Research Part I: Oceanographic Research Papers

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Estrellichnus jacaensis from the Eocene Jaca Basin of NE Spain: new locality and new ethological interpretation

Cited by 3 publications

References 46 publications

Revision of the trace fossil Megagrapton Książkiewicz, 1968 with focus on Megagrapton aequale Seilacher, 1977 from the lower Eocene of the Lesser Caucasus in Georgia

Revision of the trace fossil Megagrapton Książkiewicz, 1968 with focus on Megagrapton aequale Seilacher, 1977 from the lower Eocene of the Lesser Caucasus in Georgia

Behavioural and Environmental Significance of the Rosetted trace Fossil Dactyloidites ottoi (Geinitz, 1849) from the Early Cretaceous (Berriasian) of Kachchh, Western India

Comparison of rosette-shape traces in abyssal terrains: Environmental and faunal implications

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