The fossil record of cnidarian medusae

Young, Graham; Hagadorn, James W.

doi:10.1016/j.palwor.2010.09.014

Cited by 68 publications

(70 citation statements)

References 19 publications

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“…Jellyfish have bloomed for hundreds of millions of years (Hagadorn et al, 2002;Young & Hagadorn, 2010) and are a natural presence in healthy ecosystems. Many jellyfish populations are known to fluctuate with oceanic climate (reviews in Purcell, 2005Purcell, , 2012.…”

Section: Possible Causes Of Increasing Jellyfish Populationsmentioning

confidence: 99%

Increasing jellyfish populations: trends in Large Marine Ecosystems

et al. 2012

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Section: Possible Causes Of Increasing Jellyfish Populationsmentioning

confidence: 99%

Increasing jellyfish populations: trends in Large Marine Ecosystems

et al. 2012

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“…Concentric rings, radial structures, bed-parallel orientation, and disc-like shapes are common in chondrophorine and related medusa (Hyman 1940;Fryer and Stanley 2004). Concentric rings, weakly disclike shapes, radial structures (including radial cracks), a range of taphonomic grades (from well-to poorly preserved) and peripheral troughs are common features of fossil scyphozoan medusae (Schäfer 1941(Schäfer , 1972Müller 1984;Bruton 1991;Young and Hagadorn, 2010).…”

Section: Interpretationsmentioning

confidence: 99%

“…Thus, when preserved they not only signal that exceptional preservation has occurred, but also the opportunity to evaluate a broader spectrum of the biota and its paleoecology at a given moment and place in time. For example, throughout earth history, genuine scyphozoan, hydrozoan, or cubozoan medusae are only known from ≤10 deposits, all of which are significant or potential Konservatlagerstätten (Young and Hagadorn 2010). Deposits containing more sclerotized medusae such as porpitids (chondrophorines) and conularids are at least 1-2 orders of magnitude more common than their softer counterparts (Fryer and Stanley 2004;van Iten et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Yet there are abundant reports of isolated or rare medusalike structures, or of problematic fossils attributed to medusae (see reviews in Häntzschel 1975;Young and Hagadorn 2010). Most of these structures have a circular shape and radial or concentric ornamentation, and may have internal structures that resemble the internal cavities or organs of medusae.…”

Section: Introductionmentioning

confidence: 99%

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Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures

Hagadorn

Miller

2011

atgeol

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More than a hundred radial and discoidal structures occur on bed tops of shales and very fine sandstones of the Cambrian (Series 3) King Square Formation in New Brunswick, Canada. These structures typically contain a central sediment plug, radial lineations that extend outward from the central plug, concentric rings, and a broad trough surrounding or underlying ring margins. Originally interpreted as fossils of scyphozoan medusae, these structures could represent one of only a half-dozen mass strandings documented from the fossil record. Instead, re-evaluation of their sedimentology and morphology suggests that they are likely sedimentary structures known as Astropolithon. These sand-volcano-like structures formed by subsurface blistering, cracking, and failure of a near-surface or surface bed, triggered by the upward movement of gases or other fluids from underlying beds. RÉSUMÉPlus d'une centaine de structures radiales et discoïdes apparaissent au sommet des couches de schiste et de grès très fins de la formation King Square du Cambrien (Série 3), du Nouveau-Brunswick, au Canada. Ces structures contiennent généralement un culot sédimentaire central, des linéaments radiaux qui se déploient vers l'extérieur à partir du culot central, des anneaux concentriques, et une vaste cuvette qui ceinture le bord des anneaux ou qui se trouve en dessous. On estimait initialement qu'il s'agissait de méduses scyphozoaires, mais ces structures pourraient correspondre à l'une de la demi-douzaine d'échouages massifs de l'ichnofaune dont les vestiges fossiles ont été retrouvés. La réévaluation de leur contexte de sédimentation et de leur morphologie porte plutôt à croire que ce sont vraisemblablement des structures sédimentaires connues sous le nom d'astropolithon. Ces structures apparentées à un volcan de sable ont été formées par l'apparition d'alvéoles souterraines, le fendillement et la rupture d'une couche près de la surface ou à la surface, et qu'aurait provoquée le déplacement vers la surface de gaz ou d'autres fluides provenant des couches inférieures.[ Traduit par la redaction]atlantic geology 47, 66-80 (2011) 0843-5561|08|00066-15$3.25|o

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“…ReMARKS: The rock record is rife with discoidal and stellate structures, many of which have been described as trace or body fossils (e.g., Young and Hagadorn 2010;Hagadorn and Miller 2011). Although some such structures are biogenic, inorganic processes form most of them, and interpretations are rarely based on more than an analogy with modern organisms and processes (e.g., Reineck and Singh 1980;Ricci Lucchi 1995).…”

Section: Incertae Sedismentioning

confidence: 99%

Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A.

Collette

Getty²,

Hagadorn

2011

atgeol

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Jurassic sandstones of the Hartford Basin are well known for their dinosaur trackways, but few studies have characterized their invertebrate ichnofaunas. A notable Portland Formation exposure in this area is the Hoover Quarry in East Longmeadow, Massachusetts, where vertebrate skeletal material (the type specimen of the crocodilian Stegomosuchus longipes) occurs in association with a diverse ichnofauna. Hoover Quarry ichnogenera include Eubrontes cf. gracilis, Planolites beverleyensis, Planolites montanus, probable Scoyenia burrows, and Skolithos isp. Also preserved at the site is Palaeophycus tortuosus, a sinusoidal burrow that had been previously synonymized with Palaeophycus tubularis. A probable Skolithos burrow termination with an unusual pattern of scratches also occurs, along with several problematic stellate structures. At this site, primary sedimentary structures on trace bearing surfaces are consistent with deposition in a shallow aquatic environment that was periodically emergent. Viewed in the context of nearby sections of the Portland Formation, Hoover Quarry exposures could have been deposited in fluvial, ephemeral lacustrine, or playa environments. Traces in the Hoover Quarry indicate Scoyenia-Skolithos-composite ichnofacies, elements of which are commonly produced in continental firmground environments. RÉSUMÉLes grès du Jurassique dans le bassin de Hartford sont reconnus pour la présence d'empreintes de dinosaures. Mais peu d'études ont permis de caractériser l'ichnofaune invertébrée qu'on peut également y observer. Un affleurement notable de la Formation Portland dans la région est présent dans la carrière Hoover, à East Longmeadow, au Massachusetts, où des matériaux de squelettes de vertébrés (le spécimen type du crocodilien Stegomosuchus longipes) et une ichnofaune diversifiée sont présents. L'ichnofaune de la carrière Hoover comprend les espèces comme Eubrontes cf. gracilis, Planolites beverleyensis, Planolites montanus, vraisemblablement des terriers de Scoyenia, et Skolithos. Il y a également sur le site l'espèce Palaeophycus tortuosus, un terrier sinusoïdal qui a déjà été nommé Palaeophycus tubularis. L'extrémité d'un terrier de l'espèce probable Skolithos accompagnée d'une série inusitée de stries ou d'éraflures est en outre présente, tout comme plusieurs structures étoilées dont l'origine demeure mystérieuse. Sur le site, des structures primaires sur des surfaces marquées de traces correspondraient à une sédimentation dans un milieu aquatique peu profond qui a émergé à intervalles périodiques. Considéré dans le contexte des sections de la Formation Portland, situées à proximité, le dépôt des affleurements de la carrière Hoover pourrait être survenu dans un milieu fluvial, lacustre éphémère ou en présence d'un lac temporaire. Les traces relevées dans la carrière Hoover indiquent la présence d'un ichnofaciès composite de type Scoyenia-Skolithos, dont les éléments sont couramment produits dans un milieu de sol continental à cohésion moyenne.[Traduit par la redaction]

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The fossil record of cnidarian medusae

Cited by 68 publications

References 19 publications

Increasing jellyfish populations: trends in Large Marine Ecosystems

Increasing jellyfish populations: trends in Large Marine Ecosystems

Hypothesized Cambrian medusae from Saint John, New Brunswick, reinterpreted as sedimentary structures

Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A.

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