Reply to comment on the paper of Gierlowski-Kordesch and Cassle “The ‘Spirorbis’ problem revisited: Sedimentology and biology of microconchids in marine−nonmarine transitions” [Earth-Science Reviews, 148 (2015): 209–227]

Gierlowski‐Kordesch, Elizabeth; Falcon-Lang, Howard J.; Cassle, Christopher F.

doi:10.1016/j.earscirev.2015.11.011

Cited by 4 publications

(3 citation statements)

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“…The co-occurrence of microconchids and land plants, often to the exclusion of any clearly marine fauna, led many researchers to the notion that microconchids in these cases represented fully freshwater environments (Caruso and Tomescu 2012;Zaton et al 2012). This notion has not been without challenge (Gierlowski-Kordesch and Cassle 2015; see also Zaton et al 2016 andGierlowski-Kordesch et al 2016), and it is here acknowledged that deposits of abundant microconchids should not be taken as prima facie evidence of a freshwater system. What is of interest here is that the microconchids appear to be the only skeletal invertebrates present in the deposit.…”

Section: Depositional Environments Of the Maywood Formationmentioning

confidence: 96%

The Archaeopterid Forests of Lower Frasnian (Upper Devonian) Westernmost Laurentia: Biota and Depositional Environment of the Maywood Formation in Northern Wyoming as Reflected by Palynoflora, Macroflora, Fauna, and Sedimentology

Marshall

Holterhoff

El-Abdallah

et al. 2022

International Journal of Plant Sciences

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Premise of research. The flora of the Maywood Formation, one of only three Devonian floras previously recognized in western North America, is known only from a brief report focused on stratigraphy and has never been characterized in more detail. A detailed assessment of this flora and associated fossils has implications for the age and depositional environments of the Maywood Formation, and for Devonian plant biogeography. Methodology. Field work at the Cottonwood Canyon (Wyoming) exposure of the Maywood formation produced a measured section characterizing the sedimentology of the unit and samples that we analyzed for palynomorph, macrofloral, and faunal content using standard methods. Pivotal results. The palynological assemblage is dominated by archaeopterid progymnosperm spores, lacks unequivocally marine components, indicates low burial depth and temperature (c. 53°C) of the unit, and supports an early Frasnian age. Plant macro-and mesofossils including charcoal, adpressions, sporangia, and spore packages reflect a vegetation with quasi-monodominant archaeopterids but also including the parent plant of the seed-megaspore Spermasporites (for which the Cottonwood Canyon occurrence represents a geographic range extension). Scales indicate the presence of sarcopterygian and tetrapodomorph fishes. Sedimentary facies, palynofacies, and plant macrofossil taphonomy are consistent with a lagoon or lake margin environment on a carbonate platform, disconnected from the open marine realm. Conclusions. The arid carbonate platform of the western margin of early Frasnian Laurentia hosted a fire-prone vegetation cover heavily dominated by archaeopterid progymnosperms. The Maywood Formation preserves fossil assemblages reflecting this vegetation at Cottonwood Canyon (Wyoming), in lagoonal or lacustrine deposits that also host microconchid tubeworms and fish. The parent plant of the seedmegaspore Spermasporites, present in this vegetation, was widely distributed all across Euramerica.

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Section: Depositional Environments Of the Maywood Formationmentioning

confidence: 96%

The Archaeopterid Forests of Lower Frasnian (Upper Devonian) Westernmost Laurentia: Biota and Depositional Environment of the Maywood Formation in Northern Wyoming as Reflected by Palynoflora, Macroflora, Fauna, and Sedimentology

Marshall

Holterhoff

El-Abdallah

et al. 2022

International Journal of Plant Sciences

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“…Microconchids appeared in the Late Ordovician seas and began colonizing continental settings probably as early as during the Early Devonian Epoch, populating a wide range of environments in brackish and fresh waters (Taylor & Vinn, 2006;Caruso & Tomescu, 2012;Zatoń et al 2012Zatoń et al , 2016bZatoń & Peck, 2013;Matsunaga & Tomescu, 2017). Recently, the autochthonous origin of brackish-and fresh-water microconchids has been challenged and their presence in such settings has been explained by invasions of marine waters that brought into continental lowland aquatic systems detached tubes or short-term surviving larvae during storm surges and tsunamis (Gierlowski-Kordesch & Cassle, 2015;Gierlowski-Kordesch et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Disaster microconchids from the uppermost Permian and Lower Triassic lacustrine strata of the Cis-Urals and the Tunguska and Kuznetsk basins (Russia)

2021

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We describe aggregative microconchid (Lophophorata) tubes from the uppermost Permian (upper Changhsingian) and Lower Triassic (Olenekian) lacustrine and fluvial strata of the Tunguska and Kuznetsk basins and the southern Cis-Urals, Russia. These attach to clam shrimp carapaces, bivalve shells, terrestrial plant fragments and a horseshoe crab head shield, and also form their own monospecific agglomerations. Planispiral tubes of a wide size range (0.1–2.5 mm) create dense settlements on these firm substrates, which likely comprise multiple generations of the same species. These finds confirm that this extinct lophophorate group was inhabiting non-marine continental basins during latest Permian and earliest Triassic time, when they were major suspension feeders in such limnic ecosystems. Microconchids dispersed extensively and rapidly in the aftermath of the Permian–Triassic mass extinction into both marine and continental basins at low and moderately high latitudes, which were notably different in salinity, temperature, depth and redox conditions. This confirms that small lightly calcified microconchids were a genuine disaster eurytopic group, whose expansion may have been promoted by low predator pressure and low competition for substrate.

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“…; Gierlowski‐Kordesch & Cassle ; Gierlowski‐Kordesch et al . ) in order, perhaps, to utilize depauperate non‐marine coastal ecospace for feeding and breeding (Williams et al . ; Carpenter et al .…”

mentioning

confidence: 99%

Fish and tetrapod communities across a marine to brackish salinity gradient in the Pennsylvanian (early Moscovian) Minto Formation of New Brunswick, Canada, and their palaeoecological and palaeogeographical implications

et al. 2016

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42The cosmopolitan biogeography of many fish genera strongly indicates marine-based 43 dispersal, while strontium isotopic data suggest these same fish were exposed, at times, to ). An intriguing characteristic of this episode was the apparent widespread adoption of 68 a euryhaline habit amongst organisms as diverse as microconchids, ostracodes, xiphosurans 69 and fish (Anderson and Shuster 2003; Carpenter et al. 2011; Bennett et al. 2012; Gierlowski-70 Kordesch and Cassle 2015). Euryhaline animals are relatively rare in modern ecosystems 71 (Edwards and Marshall 2013; McCormick et al. 2013), and their dominance in Carboniferous 72 times suggests marine communities converged on similar osmoregulatory strategies in order 73 to utilise empty non-marine coastal ecospace for feeding and breeding (Williams et al. 2006; 74 Carpenter et al. 2014), prior to the widespread colonisation of freshwater tracts further inland. 75The mid-Carboniferous diversification event coincided with a sharp growth of 76Gondwanan ice sheets and the onset of significant Milankovitch-driven glacio-eustatic 86Much recent attention has been given to the apparent dominance of a euryhaline mode 87 of life amongst mid-Carboniferous fish communities (Schultze 2009; Carpenter et al. 2011 Carpenter et al. , 88 2014Carpenter et al. , 2015. However, consensus regarding ecology is currently lacking, with some 89 researchers arguing on palaeogeographic, sedimentological and geochemical grounds that fish 90 taxa, especially xenacanthid sharks (Masson and Rust 1984), may have been obligate 91 freshwater organisms (Śtamberg and Zajíc 2008;Fischer et al. 2011 Fischer et al. , 2013 Montañez and 92 Cecil 2013). In this paper, we describe a new fish fauna from the Carboniferous 93 (Pennsylvanian) of New Brunswick, Canada (Fig. 1A), and demonstrate -based on 94 independent indicators of palaeo-salinity -that fish taxa existed across a brackish to marine 95 gradient, and that communities must therefore have been euryhaline. We discuss how these 96 new findings improve understanding of Carboniferous fish ecology and the mid- 97Carboniferous diversification of non-marine ecosystems in particular. The fish fossils reported here were obtained from opencast mine sites (now reclaimed) within 102 the Minto Coalfield, Queens County, New Brunswick, Canada (Fig. 1A-C 98 +REVISE FOR TETRAPOD STORY 123Extensive borehole arrays indicate that this basal unconformity is marked by a major silcrete 124 paleosol, up to 9 m thick in places (Sullivan 1981; St Peter 2000), which mantles the 125 basement complex and indicates seasonally-dry climate weathering over the preceding (Fig. 3A), implying that the basin deepened towards the 137 southwest, and sediment progressively onlapped towards the northeast; and (2) NE-SW- Coal, fine towards the southwest (Fig. 3B) and suggest sediment transport in that direction. 140We note, however, that this inferred palaeoflow direction opposes regional patterns of Geological Surveys Branch, Fredericton (Fig. 4A). 154The low...

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Reply to comment on the paper of Gierlowski-Kordesch and Cassle “The ‘Spirorbis’ problem revisited: Sedimentology and biology of microconchids in marine−nonmarine transitions” [Earth-Science Reviews, 148 (2015): 209–227]

Cited by 4 publications

References 44 publications

The Archaeopterid Forests of Lower Frasnian (Upper Devonian) Westernmost Laurentia: Biota and Depositional Environment of the Maywood Formation in Northern Wyoming as Reflected by Palynoflora, Macroflora, Fauna, and Sedimentology

The Archaeopterid Forests of Lower Frasnian (Upper Devonian) Westernmost Laurentia: Biota and Depositional Environment of the Maywood Formation in Northern Wyoming as Reflected by Palynoflora, Macroflora, Fauna, and Sedimentology

Disaster microconchids from the uppermost Permian and Lower Triassic lacustrine strata of the Cis-Urals and the Tunguska and Kuznetsk basins (Russia)

Fish and tetrapod communities across a marine to brackish salinity gradient in the Pennsylvanian (early Moscovian) Minto Formation of New Brunswick, Canada, and their palaeoecological and palaeogeographical implications

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