Cloudina-microbial reef resilience to substrate instability in a Cadomian retro-arc basin of the Iberian Peninsula

Álvaro, J. Javier; Cortijo, Iván; Jensen, Sören; Mus, Mónica Martí; Palacios, Teodoro

doi:10.1016/j.precamres.2019.105479

Cited by 13 publications

(4 citation statements)

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“…In Cloudina riemkeae the funnel-like elements are small and nested only shallowly [ 17 ]. The type specimen of Cloudina carinata were originally thought to occur in the terminal Ediacaran [ 26 ], but is now known to be basal Terreneuvian in age [ 27 ]. A particular morphological feature of Cl.…”

Section: Resultsmentioning

confidence: 99%

“…7A). The age of Membrillar olistostrome was originally described as Late Ediacaran [ 26 ], but is considered as the earliest Terreneuvian in the most recent study [ 27 ]. A smaller specimen was also reported from the terminal Ediacaran interval of the Villarta Formation of the Ibor Group, central Spain [ 38 ], but we believe that the smaller size makes it distinct from the types of this species from the Membrillar olistostrome.…”

Section: Resultsmentioning

confidence: 99%

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Enduring evolutionary embellishment of cloudinids in the Cambrian

et al. 2021

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The Ediacaran–Cambrian transition and the following Cambrian Explosion are among the most fundamental events in the evolutionary history of animals. Understanding these events is enhanced when phylogenetic linkages can be established among animal fossils across this interval and their trait evolution monitored. Doing this is challenging because the fossil record of animal lineages that span this transition is sparse, preserved morphologies generally simple and lifestyles in the Ediacaran and Cambrian commonly quite different. Here, we identify derived characters linking some members of an enigmatic animal group, the cloudinids, which first appeared in the Late Ediacaran, to animals with cnidarian affinity from the Cambrian Series 2 and the Miaolingian. Accordingly, we present the first case of an animal lineage represented in the Ediacaran that endured and diversified successfully throughout the Cambrian Explosion by embellishing its overall robustness and structural complexity. Among other features, dichotomous branching, present in some early cloudinids, compares closely with a cnidarian asexual reproduction mode. Tracking this morphological change from Late Ediacaran to the Miaolingian provides a unique glimpse into how a primeval animal group responded during the Cambrian Explosion.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enduring evolutionary embellishment of cloudinids in the Cambrian

et al. 2021

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“…The Tamengo Formation contains allochemical and bioclastic constituents typical of Ediacaran carbonate ramps (e.g., Sumner and Grotzinger, 1993;Narbonne et al, 1994;Walter et al, 1995;Grotzinger and James, 2000;Gaucher et al, 2003;Jiang et al, 2003b;Lindsay et al, 2005;Jiang et al, 2011;Xiao et al, 2016;Vaziri and Laflamme, 2018;Warren et al, 2019;Álvaro et al, 2020). On the other hand, the detail facies analysis presented here allows for unraveling more specific characteristics of its depositional environment.…”

Section: Implications For Ediacaran Paleoenvironmentsmentioning

confidence: 96%

New Facies Model and Carbon Isotope Stratigraphy for an Ediacaran Carbonate Platform From South America (Tamengo Formation—Corumbá Group, SW Brazil)

et al. 2022

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The Ediacaran is a period characterized by the diversification of early animals and extensive neritic carbonate deposits. These deposits are still not well understood in terms of facies and carbon isotope composition (δ13C). In this study we focus on the Tamengo Formation, in southwestern Brazil, which constitutes one of the most continuous and well-preserved sedimentary record of the late Ediacaran in South America. We present new detailed lithofacies and stable isotopes data from two representative sections (Corcal and Laginha) and revise the paleoenvironmental and stratigraphic interpretation of the Tamengo Formation. The Corcal section consists of neritic deposits including shallow-water limestone beds, alternated with shale and subordinate marl beds. These facies yield specimens of the Ediacaran fossils Cloudina lucianoi and Corumbella werneri. On the other hand, the Laginha section shows more heterogeneous facies, such as impure carbonates, breccias, marls, and subordinate mudstone beds, as well as no evidence of Corumbella werneri. The stable carbon isotope record is also different between the two sections, despite belonging to the same unit. The Corcal section displays higher and more homogeneous δ13C values, consistent with those of Ediacaran successions worldwide. The Laginha section, instead, displays more variable δ13C values, which suggest the influence of local and post depositional processes. The difference between the two sections was attributed to the different distance from the shore. We propose that the difference is due to topographic variations of the continental platform, which, at the Laginha site, was steeper and controlled by extensional faults. Therefore, the Corcal section is a better reference for the Tamengo Formation, whereas the Laginha is more particular and influenced by local factors. Besides, the lithofacies associations of the Tamengo Formation are like those of the Doushantuo and Dengying formatios, in South China, with no significant biogenic carbonate buildups, and different from those of other important Ediacaran units, such as the Nama Group in Nmibia and the Buah Formation in Oman. Our work highlights the complexity and heterogeneity of Ediacaran carbonate platforms and of their carbon isotopic composition. In addition, we characterize the Corcal section as a possible reference for the Ediacaran in South America.

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“…Together with those of the skeletal eumetazoan Namacalathus , Cloudina agglomerations laid the structural groundwork for massive, stratified terminal Ediacaran reefs (Wood & Curtis, 2015). Whereas scattered Cloudina thickets may represent detritus, and not pioneer reef‐builders (Mehra & Maloof, 2018), microbially encrusted upright agglomerations are best interpreted as genuine bioconstructions (Álvaro et al ., 2020). In Namibian Nama localities, thrombolitic clots and stromatolitic laminae contributed to accrete such structures into large biostromes and bioherms, their neptunian dykes colonised by additional biomineralisers like Namapoikia (Penny et al ., 2014).…”

Section: Open Questions For the ‘Biotic Replacement’ Hypothesismentioning

confidence: 99%

Decline and fall of the Ediacarans: late‐Neoproterozoic extinctions and the rise of the modern biosphere

Mussini,

Dunn

2023

Biological Reviews

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The end‐Neoproterozoic transition marked a gradual but permanent shift between distinct configurations of Earth's biosphere. This interval witnessed the demise of the enigmatic Ediacaran Biota, ushering in the structured trophic webs and disparate animal body plans of Phanerozoic ecosystems. However, little consensus exists on the reality, drivers, and macroevolutionary implications of end‐Neoproterozoic extinctions. Here we evaluate potential drivers of late‐Neoproterozoic turnover by addressing recent findings on Ediacaran geochronology, the persistence of classical Ediacaran macrobionts into the Cambrian, and the existence of Ediacaran crown‐group eumetazoans. Despite renewed interest in the possibility of Phanerozoic‐style ‘mass extinctions’ in the latest Neoproterozoic, our synthesis of the available evidence does not support extinction models based on episodic geochemical triggers, nor does it validate simple ecological interpretations centred on direct competitive displacement. Instead, we argue that the protracted and indirect effects of early bilaterian innovations, including escalations in sediment engineering, predation, and the largely understudied impacts of reef‐building, may best account for the temporal structure and possible selectivity of late‐Neoproterozoic extinctions. We integrate these processes into a generalised model of early eumetazoan‐dominated ecologies, charting the disruption of spatial and temporal isotropy on the Ediacaran benthos as a consequence of diversifying macrofaunal interactions. Given the nature of resource distribution in Ediacaran ecologies, the continuities among Ediacaran and Cambrian faunas, and the convergent origins of ecologically disruptive innovations among bilaterians we suggest that the rise of Phanerozoic‐type biotas may have been unstoppable.

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Cloudina-microbial reef resilience to substrate instability in a Cadomian retro-arc basin of the Iberian Peninsula

Cited by 13 publications

References 50 publications

Enduring evolutionary embellishment of cloudinids in the Cambrian

Enduring evolutionary embellishment of cloudinids in the Cambrian

New Facies Model and Carbon Isotope Stratigraphy for an Ediacaran Carbonate Platform From South America (Tamengo Formation—Corumbá Group, SW Brazil)

Decline and fall of the Ediacarans: late‐Neoproterozoic extinctions and the rise of the modern biosphere

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