Conodont biostratigraphy and palaeoenvironmental trends during the Famennian (Late Devonian) in the Thuringian Buschteich section (Germany)

Girard, Catherine; Cornée, Jean‐Jacques; Charruault, Anne‐Lise; Corradini, Carlo; Weyer, Dieter; Bartzsch, Konrad; Joachimski, Michael M.; Feist, Raimund

doi:10.1127/nos/2016/0318

Cited by 18 publications

(23 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One is located in Thuringia (Germany): the Buschteich (BU) section. Sedimentological studies have shown that CT and BU sections were deposited in an outer carbonated ramp (Girard et al, 2014(Girard et al, , 2017, LS-E being deposited in a more proximal environment (Casier et al, 2002). Along each section, some levels were selected to document contrasted depositional environments.…”

Section: Methodsmentioning

confidence: 99%

“…Seven levels were sampled along the CT section and seven along the BU section, and one level was sampled along LS-E . These levels have been attributed to five different facies, based on microfacies description (Girard et al, 2014(Girard et al, , 2017, which have been ranked along a theoretical depth transect (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…It corresponds to tubular foraminifera, either straight (panel a) or irregularly (panel b) meandering. It is interpreted as adapted to an Table 1) (Casier et al, 2002;Girard et al, 2014Girard et al, , 2017. Deposits are organized according to water depth.…”

Section: Assignment Of Foraminiferal Groupsmentioning

confidence: 99%

“…(1) Does the fragmentation vary with the paleoenvironmental setting? To tackle this question, we compare the size of each morphotype The microfacies ranking corresponds to a ranking of the samples along a theoretical water depth transect, based on microfacies description (Casier et al, 2002;Girard et al, 2014Girard et al, , 2017. Ages are given by the conodont zones (Ziegler and Sandberg, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…These levels were chosen to document contrasted depositional settings. This was estimated by ranking the samples along a theoretical water depth transect, based on microfacies description in thin sections (Casier et al, 2002;Girard et al, 2014Girard et al, , 2017. To the right: mean area in square micrometers (calculated as the cumulated area of the morphotype divided by the number of item).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Assessing the composition of fragmented agglutinated foraminiferal assemblages in ancient sediments: comparison of counting and area-based methods in Famennian samples (Late Devonian)

Girard

Dufour

Charruault

et al. 2018

J. Micropalaeontol.

View full text Add to dashboard Cite

Abstract. Benthic foraminifera have been used as proxies for various paleoenvironmental variables such as food availability, carbon flux from surface waters, microhabitats, and indirectly water depth. Estimating assemblage composition based on morphotypes, as opposed to genus-or species-level identification, potentially loses important ecological information but opens the way to the study of ancient time periods. However, the ability to accurately constrain benthic foraminiferal assemblages has been questioned when the most abundant foraminifera are fragile agglutinated forms, particularly prone to fragmentation. Here we test an alternate method for accurately estimating the composition of fragmented assemblages. The "cumulated area per morphotype" method is assessed, i.e., the sum of the area of all tests or fragments of a given morphotype in a sample. The percentage of each morphotype is calculated as a portion of the total cumulated area. Percentages of different morphotypes based on counting and cumulated area methods are compared one by one and analyzed using principal component analyses, a co-inertia analysis, and Shannon diversity indices. Morphotype percentages are further compared to an estimate of water depth based on microfacies description. Percentages of the morphotypes are not related to water depth. In all cases, counting and cumulated area methods deliver highly similar results, suggesting that the less time-consuming traditional counting method may provide robust estimates of assemblages. The size of each morphotype may deliver paleobiological information, for instance regarding biomass, but should be considered carefully due to the pervasive issue of fragmentation.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Assignment Of Foraminiferal Groupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations