Cambrian Trace Fossil Zoophycos from the Czech Republic

Doucek, Jan; Mikuláš, Radek

doi:10.1515/geoca-2015-0001

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…), with scarce records from the Cambrian, including the oldest occurrence in the lower Cambrian of the southeastern California (Sappenfield et al . ), and other occurrences in middle Cambrian shales from the Czech Republic (Doucek & Mikuláš ). Pre‐Palaeozoic (late Ediacaran) spreite structures, morphologically comparable to the Palaeozoic Zoophycos from shallow water environments, have been documented recent (Macdonald et al .…”

Section: Ethological and Tracemaker Interpretationsmentioning

confidence: 88%

Evolutionary trend of Zoophycos morphotypes from the Upper Cretaceous–Lower Miocene in the type pelagic sections of Gubbio, Italy

Monaco

Bracchini²,

Rodrı́guez-Tovar

et al. 2017

LET

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About 200 Zoophycos specimens, including 90 specimens studied in detail, have been analysed in the continuous Upper Cretaceous–Lower Miocene pelagic sedimentary type sections of the Gubbio area (the Contessa Highway, Contessa Quarry and Bottaccione sections, Northern Apennines). The sediments are reddish to grey limestones and marls of the Scaglia Group and marls with volcaniclastic deposits of the Bisciaro Formation. The aim was to examine the evolutionary trend of what is probably the most debated trace fossil of all time, from the Upper Cretaceous to Lower Miocene. Despite having been found in beds ranging from the Cambrian to the present, no consensus has been reached regarding mode of construction, tracemaker or ethological explanation for Zoophycos. Four Zoophycos morphotypes are recognized at Gubbio showing variations of major and minor lamellae, apex, lobes and whorls: the Cretaceous–Eocene cone‐shaped type 1, the Upper Eocene–Middle Oligocene helicoidal type 2, the Oligocene lobate type 3 and the Upper Oligocene–Lower Miocene flat type 4. The very high ichnodensity in some beds (hundreds of specimens in discrete levels of the Bisciaro Formation, now destroyed by quarrying) seems to find explanation in abnormal concentrations of phytodetritus and organic matter on the seafloor in some periods. This very high abundance in discrete levels reflects a change in sedimentation and seafloor conditions at pre‐flysch deposition. Due to such high ichnodensity, many adjacent specimens display deformed outer margins. Taphonomic analysis shows a variation of whorls, laminae and U‐shaped lobes, reflecting ontogenetic development of the tracemaker(s) (?sipunculid worms).

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Section: Ethological and Tracemaker Interpretationsmentioning

confidence: 88%

Evolutionary trend of Zoophycos morphotypes from the Upper Cretaceous–Lower Miocene in the type pelagic sections of Gubbio, Italy

Monaco

Bracchini²,

Rodrı́guez-Tovar

et al. 2017

LET

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“…Zoophycos occurred in several palaeocontinents already in the Cambrian (Doucek & Mikuláš 2014). The Ordovician records of Zoophycos seem to be relatively common (Mikuláš 1993;Ainsaar & Meidla 2001;Kakuwa & Webb 2007;Pak et al 2010).…”

Section: Palaeogeographymentioning

confidence: 99%

The trace fossil Zoophycos from the Silurian of Estonia

Vinn¹,

Toom²

2015

Estonian J. Earth Sci.

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Trace fossils of the ichnogenus Zoophycos have been described for the first time from the Silurian of Baltica. They occur in Llandovery pure limestones of middle Estonia and in Ludfordian argillaceous limestones and early Pridoli crinoid grainstones of western Estonia (Saaremaa). The occurrence of Zoophycos in the Silurian of Estonia was not restricted to a particular facies, though all finds come from shallow-water sediments. Zoophycos had a wide geographic distribution in the Silurian.

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