The type locality of the Kellwasser-Horizons in the Upper Harz Mountains, Germany

Gereke, Manfred; Luppold, Friedrich Wilhelm; Piecha, Matthias; Schindler, Eberhard; Stoppel, Dieter

doi:10.1127/1860-1804/2014/0066

Cited by 5 publications

(3 citation statements)

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“…positive δ 13 C excursion; framboidal pyrite and fabric evidence for anoxia ; ; ; Gereke (2007); Gereke and Schindler (2012); Laurussia black shale (UKE and LKE) positive δ 13 C excursion ; ; Laurussia positive δ 13 C excursion; framboidal pyrite and trace element evidence for anoxia ; ; Gereke (2007); Gereke et al (2014); Gereke and Schindler (2012); ; Supplemental Material -page 9…”

Section: Paleocontinental Regionmentioning

confidence: 99%

Paleogeography and paleoenvironments of the Late Devonian Kellwasser event: A review of its sedimentological and geochemical expression

Carmichael

Waters

Königshof

et al. 2019

Global and Planetary Change

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The Late Devonian (383-359 Ma) was a time of prolonged climate instability with catastrophic perturbation of global marine ecosystems at the Frasnian-Famennian (F-F) and the Devonian-Carboniferous (D-C) boundaries. The causes and mechanisms of anoxia and extinction at the F-F interval are not clearly delineated, and alternative explanations for virtually every aspect of this interval are still intensely debated. In many (but not all) locations, the F-F interval is characterized by two dark, organic-rich lithologies: the Lower and Upper Kellwasser beds (as originally described in Germany) that represent a stepwise ocean anoxia and extinction sequence. The Upper and Lower Kellwasser anoxia event beds are often collectively termed the Kellwasser Event, and the termination of this sequence is within the Upper Kellwasser Event at the F-F boundary. Current knowledge is limited by significant sampling bias, as most previous studies sampled epicontinental seaways or passive continental shelves, primarily from localities across Europe and North America. Together these formed a single equatorial continent with a rising mountain chain during the Late Devonian. Our understanding of the Kellwasser Event is thus based on data and observations from a restricted set of paleoenvironments that may not represent the complete range of Late Devonian environments and oceanic conditions. In the last decade, new methodologies and research in additional paleoenvironments around the world confirm that the Kellwasser Event was global in scope, but also that its expression varies with both paleoenvironment and paleogeography. Studying the many differing geochemical and lithological expressions of the Kellwasser Event using a) a wide variety of paleoenvironments, b) a multiproxy approach, and c) placement of results into the broader context of Late Devonian marine biodiversity patterns is vital for understanding the true scope of ocean anoxia, and determining the causes of the marine biodiversity crisis at the F-F boundary.

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Section: Paleocontinental Regionmentioning

confidence: 99%

Paleogeography and paleoenvironments of the Late Devonian Kellwasser event: A review of its sedimentological and geochemical expression

Carmichael

Waters

Königshof

et al. 2019

Global and Planetary Change

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“…in the Kellwasser type locality in the Kellwasser Valley of the Harz Mountains (e.g. Gereke & Schindler 2012, Gereke et al 2014 or in the Sessacker Trench section in the Dill Syncline of the Rheinisches Schiefergebirge (e.g. Schindler et al 1998).…”

Section: Environmental Comparison Of Steinbruch Schmidt and Moravian mentioning

confidence: 99%

An Integrated Stratigraphy of the Frasnian-Famennian Boundary Interval (Late Devonian) in the Moravian Karst (Czech Republic) and Kellerwald (Germany)

Weiner¹,

Kalvoda²,

Kumpan³

et al. 2017

Bull. Geosci.

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Rapid and profound changes in Earth surface environments and biota across the Frasnian-Famennian (Fr-Fa) boundary are well known and related to one of the five most severe mass extinction events in Earth history. Here, we present sedimentological, biostratigraphical, petrophysical (gamma-ray spectrometry, magnetic susceptibility) and geochemical (X-ray fluorescence) data from environmentally distinct sections in the Moravian Karst (Czech Republic) and compare them with the Steinbruch Schmidt section in the Kellerwald (Rheinisches Schiefergebirge, Germany). Both areas were located at the southern margin of Laurussia. The studied sections span the interval from the Lower or Upper rhenana to the Palmatolepis minuta minuta or younger conodont zones and the foraminiferal Eonodosaria evlanensis Zone and Eonodosaria evlanensis-Quasiendothyra communis Interzone including high resolution biozonation of the Fr-Fa boundary interval. In the Moravian Karst pure limestone facies of an inclined carbonate ramp reflect the worldwide trend in the widespread occurrence of calcimicrobes during upper Frasnian and lower Famennian. Geochemical and petrophysical data show a decrease in grain size of the siliciclastic supply and carbonate productivity in the Kellwasser Event intervals probably due to a deepening and correlate with maximum flooding surfaces and highstand system tracts in the Steinbruch Schmidt. Certain differences in some geochemical proxies between the Moravian Karst and Steinbruch Schmidt are due to lower carbonate dilution of the latter. Significant Zr, TiO 2 , Mn or Fe 2 O 3 enrichments may indicate the influence of volcanic sources in the studied Moravian Karst Fr-Fa sections.

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“…The Usseln Limestone represents the prelude to the Late Devonian Kellwasser Crisis sequence in northwestern Germany, and varies in thickness between 7 and 72 cm (Gereke, 2007; Gereke et al., 2014; Piecha, 1993; Rabien, 1954; Volk, 1939). It has a characteristic rhythmic appearance between clay‐rich and carbonate‐rich bands alternating on cm‐scales.…”

Section: Introductionmentioning

confidence: 99%

Decoding Deep‐Time Rhythms: Probing the Limit of Stratigraphic Correlation in the Time‐Specific Facies of the Late Devonian Usseln Limestone (Rhenish Massif, Germany)

Wichern,

Bialik,

Nohl

et al. 2024

Geophysical Research Letters

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The iso‐ or diachronous character of a geologic unit is scale‐dependent, especially for time‐specific facies. The Usseln Limestone is a Late Devonian time‐specific facies from Germany, occurring immediately below the Lower Kellwasser black shale. Here, we investigate whether cm‐scale rhythmical bands within the Usseln Limestone are correlatable across its depositional basin. Its facies were studied at three locations ca. 50 km apart, representing different depositional settings. Its cm‐scale alternations in lithological facies and elemental content (μXRF) form an excellent target for correlations on millennial timescales. Correlation attempts failed to converge to a solution at the cm‐scale of individual rhythmites. Dynamic Time Warping, however, provided convincing correlations at the dm‐scale, supporting its use as a high‐resolution correlation tool. The Usseln Limestone base may be diachronous, but the top is likely isochronous. This finding is in agreement with sudden basin‐wide black shale deposition at the onset of the Kellwasser Crisis.

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The type locality of the Kellwasser-Horizons in the Upper Harz Mountains, Germany

Cited by 5 publications

References 0 publications

Paleogeography and paleoenvironments of the Late Devonian Kellwasser event: A review of its sedimentological and geochemical expression

Paleogeography and paleoenvironments of the Late Devonian Kellwasser event: A review of its sedimentological and geochemical expression

An Integrated Stratigraphy of the Frasnian-Famennian Boundary Interval (Late Devonian) in the Moravian Karst (Czech Republic) and Kellerwald (Germany)

Decoding Deep‐Time Rhythms: Probing the Limit of Stratigraphic Correlation in the Time‐Specific Facies of the Late Devonian Usseln Limestone (Rhenish Massif, Germany)

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