Soft-bodied fossils from the upper Valongo Formation (Middle Ordovician: Dapingian-Darriwilian) of northern Portugal

Kimmig, Julien; Couto, Helena; Leibach, Wade W.; Lieberman, Bruce S.

doi:10.1007/s00114-019-1623-z

Cited by 10 publications

(4 citation statements)

References 85 publications

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“…Last, a putative Ordovician pseudoarctolepid has recently been described from the Valongo Formation of northern Portugal (Kimmig et al . 2019b), but its poor preservation and oblique orientation prevent any comparison with the new specimen from Utah.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

New exceptionally preserved panarthropods from the Drumian Wheeler Konservat‐Lagerstätte of the House Range of Utah

Lerosey‐Aubril

Kimmig

Pates

et al. 2020

Papers in Palaeontology

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The Drumian Wheeler Konservat-Lagerst€ atte of the House Range of Utah (Wheeler-HR) has yielded one of the most diverse exceptionally preserved Cambrian biotas of North America. The discovery of soft-bodied fossils invariably provides precious insights into this biota, given that most of its non-biomineralizing components are known from very few specimens. This contribution describes some 30 new exceptionally preserved fossils of Wheeler panarthropods. Two new species are recognized, the radiodont Hurdia sp. nov. A and the megacheiran Kanoshoia rectifrons gen. et sp. nov. Along with a species of Leanchoilia, K. rectifrons represents the first confident megacheiran record in these strata. The presence of the radiodont genus Amplectobelua and the isoxyid species Isoxys longissimus is reported outside of the Burgess Shale in Laurentia. New specimens of Caryosyntrips serratus, Naraoia compacta, Messorocaris magna and Mollisonia symmetrica provide insights into the phylogenetic affinities, local spatial distribution and morphological variation of these species hitherto known by single specimens in the Wheeler-HR. The same is true of new materials of the more common Pahvantia hastata and Perspicaris? dilatus. Formal descriptions of the order Mollisoniida ord. nov. and family Mollisoniidae fam. nov. are also provided. Last, the preservation of body structures other than the dorsal exoskeletons is illustrated for the first time in two common components of the fauna: the agnostid Itagnostus interstrictus and the bivalved euarthropod Pseudoarctolepis sharpi. The new material substantially improves our understanding of the diversity of the Wheeler-HR biota, and provides new evidence of its distinctiveness relative to the Wheeler biota of the Drum Mountains.

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Section: Systematic Palaeontologymentioning

confidence: 99%

New exceptionally preserved panarthropods from the Drumian Wheeler Konservat‐Lagerstätte of the House Range of Utah

Lerosey‐Aubril

Kimmig

Pates

et al. 2020

Papers in Palaeontology

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“…Here, shelly and soft-bodied organisms characteristic of both Cambrian (e.g., radiodonts, lobopodians, marrellomorphs, nektaspids, paleoscolecids) and Paleozoic (e.g., horseshoe crabs, eurypterids, phyllocarids, various echinoderms, mollusks, and bryozoans) faunas occur together (Van Roy et al, 2015). A few other sparser assemblages may provide comparable windows in other regions (e.g., Muir et al, 2014; Balinski and Sun, 2015; Botting et al, 2015; Hearing et al, 2016; Aris et al, 2017; Kimmig et al, 2019). The occurrence of Tomlinsonus in shallow marine deposits in Ontario, preserved alongside diverse echinoderms, trilobites, brachiopods, and bryozoans, provides a tentative connection with these other sites and indicates that marrellomorphs were likely typical members of Ordovician marine shelf communities.…”

Section: Discussionmentioning

confidence: 99%

A new marrellomorph arthropod from southern Ontario: a rare case of soft-tissue preservation on a Late Ordovician open marine shelf

Moysiuk

Izquierdo-López

Kampouris³

et al. 2022

J. Paleontol.

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Ordovician open marine Lagerstätten are relatively rare and widely dispersed, producing a patchy picture of the diversity and biogeography of nonmineralized marine organisms and challenging our understanding of the fate of Cambrian groups. Here, for the first time, we report soft-bodied fossils, including a well-preserved marrellomorph arthropod, fragmentary carapaces, and macroalgae, from the Late Ordovician (Katian) Upper Member of the Kirkfield Formation near Brechin, Ontario. The unmineralized elements and associated exceptionally preserved shelly biota were entombed rapidly in storm deposits that smothered the shallow, carbonate-dominated shelf. The marrellomorph, Tomlinsonus dimitrii n. gen. n. sp., is remarkable for its ornate, curving cephalic spines and pair of hypertrophied appendages, suggesting a slow-moving, benthic lifestyle. Reevaluation of marrellomorph phylogeny using new data favors an arachnomorph affinity, although internal relationships are robust to differing outgroup selection. Clades Marrellida and Acercostraca are recovered, but the monophyly of Marrellomorpha is uncertain. The new taxon is recovered as sister to the Devonian Mimetaster and, as the second-youngest known marrellid, bridges an important gap in the evolution of this clade. More generally, the Brechin biota represents a rare window into Ordovician open marine shelf environments in Laurentia, representing an important point of comparison with contemporaneous Lagerstätten from other paleocontinents, with great potential for further discoveries. UUID: http://zoobank.org/884589d0-08f7-4398-ab42-1f5d459be9e9

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“…This Formation is characterized for its great paleobiodiversity, namely for the presence of trilobites and other arthropods, graptolites, brachiopods, mollusks (nautiloid cephalopod, hiolitid, rostroconchia), machaeridians (Plumulites), cnidaria, gastropods, bivalves and echinoderms (cystoids, crinoids and ophiuroids) [11], [12]. Kimmig et al [13] described the first Middle Ordovician (Dapingian-Darriwilian) soft-bodied fossils (discoidal fossil uncertainly Patanacta, wiwaxiid sclerites, and a likely pseudoarctolepid arthropod) from northern Gondwana, found in S. Pedro da Cova and Belói (Gondomar). Neto de Carvalho et al [14] reviewed microbial-related biogenic structures from the slates of Valongo Formation in Canelas, with the description of the ichnoassemblages.…”

Section: Geological and Structural Settingmentioning

confidence: 99%

Mapowanie geologiczne, stratygrafia, paleontologia i mineralizacje paleozoiku wokół kamieniołomu Valério i Muzeum Trylobitów (Geopark Arouca), Canelas, Północna Portugalia

Figueiredo,

Couto,

Valério

2024

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The studied area, a sector in the reverse limb of the Valongo Anticline adjacent to the Museum of Trilobites and to Valério’s Quarry (Canelas, Arouca), is located in the Central-Iberian Zone of the Iberian Massif. The main objective of this study was to obtain a detailed geological map, through the recognition of the lithologies, stratigraphic units, fossils, structures and mineralizations. The Palaeozoic succession from Cambrian to Carboniferous was studied, with the exception of the Devonian, which does not outcrop in the area. Regarding lithologies, a succession of volcano sedimentary layers has been found in Cambrian (Montalto Formation, Middle Cambrian) and in the Lower Ordovician (Santa Justa Formation), either underlying Floian massive quartzites (Tremadocian?) or overlying Floian massive quartzites (Floian). At the top of the Middle Ordovician (Valongo Formation, Dapingian-Darriwilian), near the contact with the Upper Ordovician (Sobrido Formation, Hirnantian), a ferruginous layer with abundant siliceous nodules occurs. In the base of the Sobrido Formation, massive quartzites underlie diamictites. Concerning the fossil record, abundant icnofossils such as Cruziana and Planolites were identified in the quartzites of the Lower Ordovician. Also, different somatofossils occur in the Middle Ordovician slates, namely trilobites (between the largest trilobites in the world) and other arthropods, graptolites, cephalopods, brachiopods, gastropods, bivalves and echinoderms (cystoids and crinoids). In Silurian, besides quartzites (Rhuddanian), light grey slates bearing graptolites, namely Monograptus (Llandovery), are dominant. In Carboniferous (Gzhelian) breccias, sandstones and slates with plant fossils, namely with articulated plants and ferns, occur. Regarding the mineral resources of the area, beyond the slates of Middle Ordovician (Valongo Formation) exploited in Valério’s Quarry, there is a Roman mining work, the Gralheira d'Água mine (Au-As type mineralizations), associated to the Lower Ordovician (Santa Justa Formation) quartzites and volcano sedimentary layers, exploited for gold. Antimony mineralizations (Sb-Au type mineralizations) associated to the volcano-sedimentary succession of the Cambrian-Ordovician transition, were found and studied by Scanning Electron Microscopy (SEM). The final work resulted in a geological map, covering an area of 1200m by 900m, at a scale of 1: 3,400.

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Soft-bodied fossils from the upper Valongo Formation (Middle Ordovician: Dapingian-Darriwilian) of northern Portugal

Cited by 10 publications

References 85 publications

New exceptionally preserved panarthropods from the Drumian Wheeler Konservat‐Lagerstätte of the House Range of Utah

New exceptionally preserved panarthropods from the Drumian Wheeler Konservat‐Lagerstätte of the House Range of Utah

A new marrellomorph arthropod from southern Ontario: a rare case of soft-tissue preservation on a Late Ordovician open marine shelf

Mapowanie geologiczne, stratygrafia, paleontologia i mineralizacje paleozoiku wokół kamieniołomu Valério i Muzeum Trylobitów (Geopark Arouca), Canelas, Północna Portugalia

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