An association of problematic corals, crinoids and parasites from the Sholeshook Limestone Formation (Ordovician) of Wales

Peel, John S.; McDermott, Patrick D.

doi:10.1002/gj.2617

Cited by 4 publications

(6 citation statements)

References 42 publications

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“…As with other co-occurring skeletal elements, fossilized, hardened, bromalites from Greenland are frequently penetrated by microborings attributed to endolithic cyanobacteria (Stockfors & Peel 2005a, 2005bZhang & Pratt 2008;Peel 2014;Peel & McDermott 2014). Fractured surfaces of bromalites from GGU sample 482334 (Henson Gletscher Formation, Assemblage C, locality 7), resulting from breakage during preparation, display numerous striated galleries (diameter up to 10 mm) on the amorphous phosphate surfaces ( Fig.…”

Section: Formation and Diagenesismentioning

confidence: 96%

Bromalites from the Cambrian (Series 2 and 3) of North Greenland

Peel

2015

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Six assemblages of phosphatized bromalites from the Cambrian (Series 2 and 3) of North Greenland provide added insight into community structure in fossil assemblages otherwise dominated by microscopic skeletonized organisms. The bromalites, picked from acetic acid residues, display a wide range of morphologies, including pellets, segmented rods, wrinkled, smooth and segmented convoluted strings. Most are interpreted as extruded faecal material (coprolites) but moulds from the digestive tract (cololites) are also recognized. Most of the coprolites probably were produced by deposit-feeding invertebrates but rare specimens dominated by carapace fragments of bradoriid? arthropods are coprolites from predators. Zigzag-folded bromalites are interpreted as cololites of orthothecid hyoliths and are also recognized in inequivalent strata in China. Longitudinally wrinkled forms may be cololites of unknown origin. Minute spheres (Arenigiapella) forming one coprolite are interpreted as microcrystalline phosphatic coatings of bacteria. Post-diagenetic boring attributed to endolithic cyanobacteria is widespread.

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Section: Formation and Diagenesismentioning

confidence: 96%

Bromalites from the Cambrian (Series 2 and 3) of North Greenland

Peel

2015

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“…Dzik (1993) considered Cothonion to be a rugose coral, but this was rejected by Fedorowski (1997). As is the case with cambroctoconids, Cothonion was considered to represent one of several independent calcification events in anthozoan evolutionary history by Scrutton (1997Scrutton ( , 1999; see also Coates, 1987 andMcDermott, 2016).…”

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confidence: 99%

A problematic cnidarian (Cambroctoconus; Octocorallia?) from the Cambrian (Series 2–3) of Laurentia

Peel¹

2017

J. Paleontol.

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Abstract.-The problematic calcified cnidarian Cambroctoconus is described from the Henson Gletscher Formation (Cambrian Series 2, Stage 4-Series 3, Stage 5) of North Greenland, representing the first record from Laurentia of a genus otherwise recently described from China, Kyrgyzstan, and Korea. Internal molds produced by penetrative phosphatization mirror the pervasive pore system of the calice walls and septa. The pore system is compared to the network of gastrodermal solenia that distributes nutrients between polyps and surrounding stolon tissues in present day octocorals. In conjunction with the octagonal form of the individual coralla and eight-fold symmetry of septa, the pore system promotes assignment of Cambroctoconus to the Octocorallia, a basal clade in cnidarian phylogeny. Octocorals ('soft corals') are diverse in present day seas, but have a poor fossil record despite the general development of distinctive calcareous spicules. New taxa: Order Cambroctoconida new; Cambroctoconus koori new species.

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“…The curved to coiled early growth stages seen in many coralla of Talfania described by Peel and McDermott () resulted from circumferential attachment to crinoid stems or disarticulated columnals. However, as with the Cambrian stem‐group corals, the shape of the individual coralla varied depending on the substrate and substrate stability, in combination with an inferred preference for upward growth as indicated by a component of translation along the stems (Peel and McDermott ). In contrast, the curvature in rugose corals is commonly the result of the larva settling on a shell fragment and an initial vertical growth.…”

Section: Tomteluvids and Cambrian Coralimorphsmentioning

confidence: 96%

“…The similarity in overall morphology, however, may indicate an adaptation to a similar environment and ecospace. Tomteluvids not only resemble coeval stem‐group corals, but ecologically also might be comparable to younger cnidarians, such as the upper Ordovician coral Talfania Peel and McDermott, , and many solitary rugose corals.…”

Section: Tomteluvids and Cambrian Coralimorphsmentioning

confidence: 99%

A new family ofCambrian rhynchonelliformean brachiopods (OrderNaukatida) with an aberrant coral‐like morphology

et al. 2016

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Tomteluva perturbata gen. et sp. nov. and Nasakia thulensis gen. et sp. nov., two new rhynchonelliformean brachiopod taxa, are described from carbonate beds from the lower middle Cambrian (Series 3, Stage 5) basinal Stephen Formation, Canada, and the upper lower Cambrian (Series 2, Stage 4) Henson Gletscher Formation, North Greenland, respectively. The two taxa are characterized by an unusual coral-like morphology typified by a high conical ventral valve with an anteriorly curved umbo and a tube-like structure inside the ventral valve, interpreted as pedicle tube. Both resemble the problematic late middle Cambrian (Drumian) species Anomalocalyx cawoodi Brock from Australia, whose systematic affiliation is controversial. Together, the three genera are interpreted as representatives of a new family of rhynchonelliformean brachiopods, the Tomteluvidae fam. nov., which is interpreted as an aberrant or derived taxon within the Order Naukatida. Convergence between the Tomteluvidae and the coralla of small solitary Cambrian coralimorphs, as well as the late Palaeozoic reef-building richthofenioid brachiopods, might indicate adaptation to a similar life habits and environments. However, their small size (length 4 mm), well-developed pedicle and perfect morphological symmetry make it more likely that tomteluvids lived attached to frondose algae or sponges, above the seafloor, in a similar fashion to the acrotretoid brachiopods with which they show a high degree of morphological convergence. Morphological features of the pedicle tube of N. thulensis suggest that the tomteluvid pedicle is homologous to that in modern rhynchonelliformean brachiopods. This is the first evidence of the pedicle type within the Naukatida and represents the oldest confirmation of a rhynchonellate pedicle.

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An association of problematic corals, crinoids and parasites from the Sholeshook Limestone Formation (Ordovician) of Wales

Cited by 4 publications

References 42 publications

Bromalites from the Cambrian (Series 2 and 3) of North Greenland

Bromalites from the Cambrian (Series 2 and 3) of North Greenland

A problematic cnidarian (Cambroctoconus; Octocorallia?) from the Cambrian (Series 2–3) of Laurentia

A new family ofCambrian rhynchonelliformean brachiopods (OrderNaukatida) with an aberrant coral‐like morphology

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