Micrometric detail in palaeoscolecid worms from Late Ordovician sandstones of the Tafilalt Konservat-Lagerstätte, Morocco

Gutiérrez-Marco, J. C.; García‐Bellido, Diego C.

doi:10.1016/j.gr.2014.04.006

Cited by 26 publications

(8 citation statements)

References 20 publications

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“…kerogen) and/or soluble carbonaceous materials (Cai et al, 2012;Schiffbauer et al, 2014b;Stankiewicz et al, 2000), as observed in carbonaceous compressions (Xiao et al, 2002), small carbonaceous microfossils (Butterfield and Harvey, 2012), and organically preserved skeletal fossils . Non-biomineralized tissues are also sometimes preserved in siliciclastic rocks as casts, molds, and impressions (Gutiérrez-Marco and García-Bellido, 2015;Muscente and Allmon, 2013), such as Ediacara-type fossils (Laflamme et al, 2011;Narbonne, 2005).…”

Section: Taphonomic Processesmentioning

confidence: 99%

Exceptionally Preserved Fossil Assemblages Through Geologic Time and Space

Muscente¹,

Laflamme²,

Schiffbauer³

et al. 2016

Geological Society of America Abstracts With Programs

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Geologic deposits containing fossils with remains of non-biomineralized tissues (i.e. Konservat-Lagerstätten) provide key insights into ancient organisms and ecosystems. Such deposits are not evenly distributed through geologic time or space, suggesting that global phenomena play a key role in exceptional fossil preservation. Nonetheless, establishing the influence of global phenomena requires documenting temporal and spatial trends in occurrences of exceptionally preserved fossil assemblages. To this end, we compiled and analyzed a dataset of 694 globally distributed exceptional fossil assemblages spanning the history of complex eukaryotic life (~610 to 3 Ma). Our analyses demonstrate that assemblages with similar ages and depositional settings commonly occur in clusters, each signifying an ancient geographic region (up to hundreds of kilometers in scale), which repeatedly developed conditions conducive to soft tissue preservation. Using a novel hierarchical clustering approach, we show that these clusters decrease in number and shift from open marine to transitional and nonmarine settings across the Cambrian-Ordovician interval. Conditions conducive to exceptional preservation declined worldwide during the early Paleozoic in response to transformations of near-surface environments that promoted degradation of tissues and curbed authigenic mineralization potential. We propose a holistic explanation relating these environmental transitions to ocean oxygenation and bioturbation, which affected virtually all taphonomic pathways, in addition to changes in seawater chemistry that disproportionately affected processes of soft tissue conservation. After these transitions, exceptional preservation rarely occurred in open marine settings, excepting times of widespread oceanic anoxia, when low oxygen levels set the stage. With these patterns, nonmarine cluster count is correlated with non-marine rock quantity, and generally decreases with age. This result suggests that geologic processes, which progressively destroy terrestrial rocks over time, limit sampling of non-marine deposits on a global scale. Future efforts should aim to assess the impacts of such phenomena on evolutionary and ecological patterns in the fossil record.

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Section: Taphonomic Processesmentioning

confidence: 99%

Exceptionally Preserved Fossil Assemblages Through Geologic Time and Space

Muscente¹,

Laflamme²,

Schiffbauer³

et al. 2016

Geological Society of America Abstracts With Programs

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“…formed of polysaccharides), such as annelids and priapulids, or even entirely cellular bodies, such as jellyfish (e.g. Liu et al, 2008;Lamsdell et al, 2013;Duan et al, 2014;Lei et al, 2014;Gutiérrez-Marco and García-Bellido, 2015;Martin et al, 2016a;Lerosey-Aubril et al, 2017). Thus, studies based on mineralized parts in the fossil record provide incomplete samples of past animal life on Earth.…”

Section: Introductionmentioning

confidence: 99%

Insights into soft-part preservation from the Early Ordovician Fezouata Biota

Saleh

Vaucher

Antcliffe

et al. 2021

Earth-Science Reviews

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The Fezouata Biota in Morocco is the only Lower Ordovician Lagerstätte yielding a biologically diverse assemblage in a fully marine environment, whilst also containing organisms typical of Cambrian Burgess Shale-type (BST) ecosystems. Fossils from the Fezouata Shale share the same mode of preservation as Cambrian BST biotas defined by carbonaceous compressions and accessory authigenic mineralization. Most organisms of the Fezouata Biota were already dead and decaying on the seafloor when they were buried insitu by occasional storm-induced deposits in an environment just below the storm-weather wave base. Pre-burial decay in the Fezouata Shale was responsible for the non-preservation of completely cellular organisms such as jellyfish. These conditions contrast with the processes described for soft-tissue preservation in the Burgess Shale (Canada) and the Chengjiang Biota (China). In these two Cambrian Lagerstätten, animals were transported alive or shortly after death by obrution events to an environment that was favorable for preservation. Despite preservational biases, the autochthonous assemblages of the Fezouata Shale offer a unique opportunity to decipher the structure of in-situ communities and ecological dynamics in Early Palaeozoic seas, when compared to the allochthonous communities of most Cambrian BST biotas.

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“…Additionally, and with the purpose to analyse in detail some yet undescribed articulation devices, four additional specimens were used: three prone carapaces of Placoparia ( Placoparia ) sp. from the Izegguirene Formation of Morocco (Bou Nemrou locality, late Dobrotivian: see Gutiérrez‐Marco & García‐Bellido ) and one specimen of Placoparia (Placoparia) cambriensis (= P . ‘ barrandei ’ Prantl & Šnajdr ) from the middle Darriwilian beds of the Šárka Formation of Bohemia (Czech Republic).…”

Section: Methodsmentioning

confidence: 99%

Evolution of trilobite enrolment during the Great Ordovician Biodiversification Event: insights from kinematic modelling

Esteve¹,

Gutiérrez-Marco

Rubio³

et al. 2018

LET

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The Great Ordovician Biodiversification Event (GOBE) represents a diversification at lower taxonomic levels of most body plans that had appeared during the Cambrian explosion. Among trilobites, several novelties related to enrolment evolved during the GOBE. A kinematic analysis by means of 3D modelling of some new enrolment types shows no relationship with those of the Cambrian trilobites. While some structures emerged for the first time in Ordovician trilobites (e.g. articulations and panderian organs), other structures (e.g. anterior and posterior arch in head and tail) appear earlier in Cambrian trilobites. Our results suggest that the evolution of some groups was clearly rooted in the Cambrian explosion while others clearly appeared during the GOBE.

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Micrometric detail in palaeoscolecid worms from Late Ordovician sandstones of the Tafilalt Konservat-Lagerstätte, Morocco

Cited by 26 publications

References 20 publications

Exceptionally Preserved Fossil Assemblages Through Geologic Time and Space

Exceptionally Preserved Fossil Assemblages Through Geologic Time and Space

Insights into soft-part preservation from the Early Ordovician Fezouata Biota

Evolution of trilobite enrolment during the Great Ordovician Biodiversification Event: insights from kinematic modelling

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