Faunal Correlation of the Ellenburger Limestone of Texas

Dake, C. L.; Bridge, Josiah

doi:10.1130/gsab-43-725

Cited by 7 publications

(6 citation statements)

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“…In addition to Portnoy (1987) and Ruppel & Kerans (1987), stromatolite mounds in this vicinity were reported by Comstock (1889, p. 301) and Dake & Bridge (1932, p. 726–727) (see Appendix S1). This section was also described by Cloud & Barnes (1948, p. 136, 146–147), mentioned by Johns et al .…”

Section: Localitiessupporting

confidence: 55%

“…The Moore Hollow Group is divided into the lower, more siliciclastic, Riley Formation and the upper, more carbonate, Wilberns Formation (Barnes & Bell, 1977). In central Texas, the Wilberns is divided into the Welge, Morgan Creek, Point Peak and San Saba members (Dake & Bridge, 1932; Romberg & Barnes, 1944; Bridge et al ., 1947; Barnes & Bell, 1977) (Fig. 2).…”

Section: Geological Settingmentioning

confidence: 99%

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Stromatolite‐rimmed thrombolite columns and domes constructed by microstromatolites, calcimicrobes and sponges in late Cambrian biostromes, Texas, USA

Lee

Riding

2022

Sedimentology

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Microbial carbonates formed stromatolitic, thrombolitic, dendrolitic and maceriate (mazelike) fabrics in shallow marine Cambrian-Early Ordovician carbonates encircling Laurentia. However, poor preservation often hinders recognition of their specific components. Well-preserved examples of normal shallow marine limestones in the ca 490 Ma upper Cambrian Point Peak Member, Wilberns Formation, central Texas, include stromatolitic cones, steep-sided laminated rimmed columns with grainy interiors, and laminated and maceriate domes. Together these form decimetre to metre-thick biostromes. In these examples, a single component, microstromatolite, on its own or with minor calcimicrobes, creates macroscopic stromatolitic, dendrolitic, thrombolitic and maceriate fabrics. Microstromatolites constructed upward widening stromatolitic cones that developed into columns with laminated rims surrounding slightly depressed interiors. These columns accumulated allochthonous sediment by a 'bucket effect'. Their interiors contain either clusters of dendrolitic microstromatolite or ragged columns of laminated stromatolite-sponge biolithite, and are often characterized by a 'mottled' fabric that superficially resembles thrombolite. This mottling was formed by localized dolomitization around millimetric burrows that otherwise do not appear to have significantly influenced the biolithite fabric. Calcimicrobes, including cyanobacteria (Razumovskia) and microproblematica (Renalcis and Tarthinia), impart a mesoscopic clotted appearance to maceriate fabric, and locally to column rims, both of which are dominated by microstromatolite. Similar component-fabric relationships should be recognizable in rimmed columns and domes that were locally abundant elsewhere in Cambrian-Early Ordovician shallow carbonate seas.

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Section: Localitiessupporting

confidence: 55%

Section: Geological Settingmentioning

confidence: 99%

Stromatolite‐rimmed thrombolite columns and domes constructed by microstromatolites, calcimicrobes and sponges in late Cambrian biostromes, Texas, USA

Lee

Riding

2022

Sedimentology

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“…At one time it was assumed that beds of mid-Canadian age were particularly characterized by this form of gastropod, and one could speak of an "Eccyliomphalus gyroceras zone" (see for example Dake and Bridge 1932). Although this particular zone may have some merit, a number of similarly open coiled species are known throughout the early and middle Paleozoic.…”

Section: Figsmentioning

confidence: 97%

Taphonomy and Taxonomy of the Early Ordovician Gastropod Ceratopea canadensis (Billings), 1865

Yochelson¹,

Copeland²

1974

Can. J. Earth Sci.

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Several hundred silicified specimens of Pleurotomaria canadensis Billings, 1865 and other rare fossils indicative of a late Canadian age have been collected from the Oxford Formation, southwest of Ottawa, Ontario. Redescription of this neglected gastropod species permits its assignment to the genus Ceratopea. even though no ceratopean opercula have been found.Rare faunal elements include ribeirioids and open coiled gastropods that may have lived, respectively. in and on a mud bottom. There is no evidence that they have been transported. It is suggested that Ceratopea canadensis lived on algal mats some distance away from the shore and from where it is now found. After death, the soft parts of this gastropod decayed and the heavy operculum rotted off. The lightened shell, filled with gas, floated shoreward, likely under conditions of relatively calm water. Discovery of opercula within the Oxford Formation would provide evidence to support this hypothesis.La Formation de Oxford, du sud-ouest d'ottawa, Ontario, a produit plusieurs centaines de spkcimens silicifiks de Pleurotomaria canadensis Billings, 1865 et d'autres fossiles rares indiquant un 2ge Canadien supkrieur. Une nouvelle description de cette espece nkgligke de gastkropode rend possible son attribution au genre Ceratopea, mtme si aucun opercule caractkristique de ce genre n'a kt6 retrouvd.Parmi les dements fauniques plus rares, on trouve des gastkropodes ribeirioi'des et B enroulement lache qui ont pu vivre respectivement, dans et sur un substrat boueux. On ne note aucune kvidence de transport. I1 est suggkrk que Ceratopea canadensis vivait sur des tapis algaires ? i quelque distance du rivage et du lieu ou il est prksentement trouvk. Apres la mort, les parties molles de I'animal se dkomposerent et le lourd opercule s'en dktacha. La coquille, ainsi allkgke, remplie de gaz, a pu flotter vers le rivage, probablement sous des conditions d'eau relativement calme. La dkcouverte d'opercules dans la Formation de Oxford tournerait des kvidences pour ktayer cette hypothese.[Traduit par le journal]

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“…Before those, as discussed previously, identification was based primarily on the annulate habit of the genotype (Billings 1859(Billings , 1865Cullison 1944;de Koninck 1898;Dake and Bridge 1932;Poulsen 1937;Rauff 1894;van Kempen 1978;Walcott 1886). Archaeoscyphia boltoni (Rigby and Nitecki 1973;and personal observation of type material), however, is weakly annulate, and assignment to that genus seems to have been pristacked, and slope gently towards the base (GSC syntype 73-75), as in Archaeoscyphia, or flex upward subtly, culminating roughly at the surface of trab pinnation (paratype GSC 54839).…”

Section: Canal Patternmentioning

confidence: 99%

Silurian Archaeoscyphia from the Canadian Arctic: a case for simplified generic taxonomy in the anthaspidellid lithistids (Porifera)

Freitas¹

1989

Can. J. Earth Sci.

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Abundant anthaspidellid orchoclad lithistids occur in thin biostromes of Wenlockian age of the Canadian Arctic. The sponges are well preserved, and many have similar internal architecture. Synonymization of Calycocoelia Bassler, 1927, Rhopalocoelia Raymond and Okulitch, 1940, Somersetella Rigby and Dixon, 1979, and Steliella Hinde, 1889 under the genus Archaeoscyphia Hinde, 1889 is necessary in light of continuous morphological variation of the more than 100 specimens in the study collection. Synonymization takes into consideration various features formerly used to define the five taxa, including parietal width, canal diameter, annulation, presence of monaxons in trabs, dermalia, position of the trab-pinnation surface, spicule dimension, and canal disposition. Several features previously thought to be distinctive generically are shown to be species significant or to be a result of variation within a single species or specimen.De nombreuses tponges lithistides (anthaspidellides) sont prtsentes dans de petits biostromes d'gge wenlockien de I' Arctique canadien. Ces tponges sont bien pkservtes, et plusieurs posskdent une structure interne identique. Des variations graduelles de morphologie observtes sur plus de cent sptcimens suggkrent que les genres Calycocoelia Bassler, 1927, Rhopalocoelia Raymond et Okulitch, 1940, Somersetella Rigby et Dixon, 1979 et Steliella Hinde, 1889 tombent en synonymie sous le genre Archaeoscyphia Hinde, 1889. Ce regroupement tient compte des carattristiques morphologiques jusqu'k maintenant utiliskes pour distinguer les cinq genres dtjh mentionnts comme la << largeur parittale P, le diamktre des canaux, 1'<< anneau n , la pksence de monaxons dans les '< trabs P, les spicules derrnales, la position de la surface du << pimation *, la dimension des spicules et la disposition des canaux. La pksente ttude montre que plusieurs de ces caracteristiques considtkes comme repksentatatives au niveau du genre le sont plut6t au niveau de l'espkce ou encore sont le dsultat de variation chez une espkce ou un sptcimen.

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Faunal Correlation of the Ellenburger Limestone of Texas

Cited by 7 publications

References 0 publications

Stromatolite‐rimmed thrombolite columns and domes constructed by microstromatolites, calcimicrobes and sponges in late Cambrian biostromes, Texas, USA

Stromatolite‐rimmed thrombolite columns and domes constructed by microstromatolites, calcimicrobes and sponges in late Cambrian biostromes, Texas, USA

Taphonomy and Taxonomy of the Early Ordovician Gastropod Ceratopea canadensis (Billings), 1865

Silurian Archaeoscyphia from the Canadian Arctic: a case for simplified generic taxonomy in the anthaspidellid lithistids (Porifera)

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