The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden

Kröger, Björn

doi:10.5852/ejt.2013.41

Cited by 442 publications

(32 citation statements)

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“…The collections include a total of more than 500 cephalopod specimens. In almost all cases, the specimen are labelled with a collection date and a locality such as ‘Osmundsberget’ or ‘Kallholn’, but with no detailed stratigraphic or locality information (for a detailed listing of the collection localities see Kröger ). The approximate stratigraphical position of most specimens in the collection can be estimated by their characteristic lithology.…”

Section: Methodsmentioning

confidence: 99%

“…The diversity measures and the measures of evenness are calculated based on subsampled richness after the shareholder quorum subsampling method of Alroy () using R and the functions of the version 3.3 provided by John Alroy in 2011 (http://bio.mq.edu.au/~jalroy/SQS.html). The diversity calculation is based on the Katian cephalopod occurrences within the Boda Limestone at the locality Kallholn (Table , see Kröger , for detailed locality information).…”

Section: Methodsmentioning

confidence: 99%

“…A diverse assemblage of more than 60 species of cephalopods of the Boda mounds recently was described by Kröger () (Table ). This assemblage is peculiar because endemism is less strongly expressed than in other Boda faunas, and the composition of the collection is suitable for a number palaeobiological analyses.…”

Section: Complete List Of Boda Limestone Cephalopod Species and Numbementioning

confidence: 99%

“…This assemblage is peculiar because endemism is less strongly expressed than in other Boda faunas, and the composition of the collection is suitable for a number palaeobiological analyses. Herein, we analyse the cephalopod assemblage and the results of the taxonomic description of Kröger ().…”

Section: Complete List Of Boda Limestone Cephalopod Species and Numbementioning

confidence: 99%

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Palaeoecology and palaeogeography of Late Ordovician (Katian–Hirnantian) cephalopods of the Boda Limestone, Siljan district, Sweden

Kröger

Ebbestad

2014

LET

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The carbonates associated with the Late Ordovician (Katian-Hirnantian) Boda mounds of the Siljan district, Sweden, contain a rich cephalopod fauna. Cephalopods are rare in the micritic stromatactis facies of the Katian Boda Core Member, but are concentrated together with other molluscs and trilobites in synsedimentary fillings of caves and crevices of the lithified mound limestone. More than 60 cephalopod species are known from these fillings. The assemblage is dominated in richness and abundance by small orthoconic proteoceratids of the genus Isorthoceras and by curved barrandeocerids, and is considerably less endemic than the benthic fauna of the Boda mounds. Similarities are remarkable at the species level with assemblages from elsewhere in Baltica, with Avalonia and south-western Kazakhstan. A genus-level comparison reveals affinities with Laurentia. However, the genus-level similarities are interpreted as reflecting mainly similarities of the depositional environment and of physicochemical conditions. The presence of calcareous algae in the Boda Limestone and maximum hydrostatic septal strength of cephalopods indicate a depositional depth of <100 m, well within the euphotic zone. The dominance and diversity of cephalopods with vertical migrant lifestyle and the absence of actinocerids indicate a cool, nutrient-rich deeper neritic environment. The post-Katian sediments contain a drastically reduced diversity, dominated by orthocerids. The maximum hydrostatic septal strength of the Hirnantian cephalopods and sedimentological features indicate a shallowing during the Hirnantian, but a continuation of high food availability for cephalopods in the water column. □ Assemblage analysis, cephalopod diversity, Ordovician mud mounds.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Complete List Of Boda Limestone Cephalopod Species and Numbementioning

confidence: 99%

Section: Complete List Of Boda Limestone Cephalopod Species and Numbementioning

confidence: 99%

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Palaeoecology and palaeogeography of Late Ordovician (Katian–Hirnantian) cephalopods of the Boda Limestone, Siljan district, Sweden

Kröger

Ebbestad

2014

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“…The chambered shell imposed a limit to habitat or swimming depths, which probably is the reason for some endemism within the group (e.g., Cretaceous nautiloids at a specific level, Cichowolski, 2003). For some taxa, water temperatures might have played a role as a dispersion barrier, as is possibly the case for discosorids and ascocerids (e.g., Kröger, 2013). In ammonoids, the first ontogenetic stage was planktonic and prone to dispersal with oceanic currents.…”

Section: Cichowolski and Rustán-early Devonian Bactritids From Argentinamentioning

confidence: 99%

First report of Devonian bactritids (Cephalopoda) from South America: paleobiogeographic and biostratigraphic implications

Cichowolski

Rustán

2017

J. Paleontol.

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Abstract.-Devonian bactritids are described for the first time from South America. They come from siliciclastic rocks of the Talacasto Formation in the Precordillera Basin, west-central Argentina. The host strata span the Lochkovian-Emsian and contain other non-ammonoid cephalopods as well, thus refuting the alleged virtual absence of cephalopods in circumpolar Devonian basins from southwestern Gondwana (the Malvinokaffric Realm). We report Bactrites gracilis and Devonobactrites? sp., whose wide distribution contrasts with the endemic paleobiogeographic signature of some other taxonomic groups in these basins. Furthermore, new Lochkovian and Pragian records of Bactrites sp. provide new insights into the earliest bactritid records worldwide.

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Conodonts in the Upper Ordovician Keisley Limestone of northern England: taxonomy, biostratigraphical significance and biogeographical relationships

Bergström

Ferretti²

2014

Papers in Palaeontology

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The classical fauna from the Keisley Limestone, one of the first Upper Ordovician conodont faunas described from the UK, is re-evaluated based on relatively abundant collections of well-preserved conodont elements representing 20 multielement taxa. Common taxa are representatives of Amorphognathus duftonus, Birksfeldia circumplicata, Eocarniodus aff. E. gracilis, Hamarodus brevirameus, Scabbardella altipes, Strachanognathus parvus and several coniform species. These occur with more rare specimens of, among others, Aphelognathus nudus, Amorphognathus aff. A. ordovicicus, Dapsilodus mutatus, Icriodella prominens, Icriodella rhodesi sp. nov. and Protopanderodus liripipus. One new species is proposed, and the concepts of Birksfeldia, Gamachignathus, Icriodella and Notiodella are discussed. It is proposed that Birksfeldia is a senior synonym of Gamachignathus and Notiodella a junior synonym of Icriodella. The described Keisley species association, which represents the A. ordovicicus Zone and is of late Katian (Ka4) age, is closely similar to those of the Boda Limestone of south-central Sweden and some other European faunas, but coeval shallow-water faunas from eastern North America differ in several respects from these European faunas. Biostratigraphy and carbon isotope chemostratigraphy indicate that most of the Keisley Limestone is of late Katian age

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The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden

Cited by 442 publications

References 21 publications

Palaeoecology and palaeogeography of Late Ordovician (Katian–Hirnantian) cephalopods of the Boda Limestone, Siljan district, Sweden

Palaeoecology and palaeogeography of Late Ordovician (Katian–Hirnantian) cephalopods of the Boda Limestone, Siljan district, Sweden

First report of Devonian bactritids (Cephalopoda) from South America: paleobiogeographic and biostratigraphic implications

Conodonts in the Upper Ordovician Keisley Limestone of northern England: taxonomy, biostratigraphical significance and biogeographical relationships

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