The Jurassic of Skåne, southern Sweden

Ahlberg, Anders; Sivhed, Ulf; Erlström, Mikael

doi:10.34194/geusb.v1.4682

Cited by 25 publications

(11 citation statements)

References 42 publications

(60 reference statements)

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“…The studied specimen was collected from mafic volcaniclastic deposits (“Djupadal formation” of Augustsson, 2001) near Korsaröd lake (Höör municipality, central Skåne, Sweden). The host strata are interpreted to be local remnants of ash falls and lahar flows that spread from a nearby volcanic centre, similar to other occurrences of mafic volcaniclastic and epiclastic deposits associated with basaltic necks in central Skåne (Norling et al , 1993; Ahlberg, Sivhed & Erlström, 2003). Palynological analyses indicate a late Pliensbachian (later Early Jurassic) age (Bomfleur, Vajda & McLoughlin, in press ), which agrees well with radiometric dating of associated basaltic necks that place the peak phase of volcanism in central Skåne in the Pliensbachian to Toarcian ( ca 183 Ma; Bergelin, 2009).…”

Section: Methodsmentioning

confidence: 56%

A fossilOsmundafrom the Jurassic of Sweden—reconciling molecular and fossil evidence in the phylogeny of Osmundaceae

Bomfleur

Grimm

McLoughlin

2014

Preprint

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1The systematic classification of Osmundaceae has long remained controversial. Recent 2 molecular data indicate that Osmunda is paraphyletic, and needs to be separated into 3Osmundastrum and Osmunda s. str. Here we describe an exquisitely preserved Jurassic 4Osmunda rhizome (O. pulchella sp. nov.) that combines diagnostic features of Osmundastrum 5and Osmunda, calling molecular evidence for paraphyly into question. We assembled a new 6 morphological matrix based on rhizome anatomy, and used network analyses to establish 7 phylogenetic relationships between fossil and extant members of modern Osmundaceae. We 8 re-analysed the original molecular data to evaluate root-placement support. Finally, we 9 integrated morphological and molecular data-sets using the evolutionary placement algorithm. 10Osmunda pulchella and five additional, newly identified Jurassic Osmunda species show 11 anatomical character suites intermediate between Osmundastrum and Osmunda. Molecular 12 evidence for paraphyly is ambiguous: a previously unrecognized signal from spacer sequences 13 favours an alternative root placement that would resolve Osmunda s.l. as monophyletic. Our 14 evolutionary placement analysis identifies fossil species as ancestral members of modern 15 genera and subgenera. Altogether, the seemingly conflicting evidence from morphological, 16 anatomical, molecular, and palaeontological data can be elegantly reconciled under the 17 assumption that Osmunda is indeed monophyletic; the recently proposed root-placement in 18Osmundaceae-based solely on molecular data-likely results from un-or misinformative 19 out-group signals. 20

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Section: Methodsmentioning

confidence: 56%

A fossilOsmundafrom the Jurassic of Sweden—reconciling molecular and fossil evidence in the phylogeny of Osmundaceae

Bomfleur

Grimm

McLoughlin

2014

Preprint

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“…To the south-east, along the Fennoscandian Border Zone in Skåne, southern Sweden, the development corresponds to that of the Sorgenfrei-Tornquist Zone in the Danish area. A change from the marine Rydebäck Formation to fluvial, lacustrine, lagoonal and shallow marine deposits of the Fuglunda Beds (Mariedal formation) and the Vilhelmsfält Formation (Ahlberg et al 2003, this volume) took place in the late Aalenian, and deltaic deposition seems to have continued throughout the Bathonian (Figs 2, 33, 34). The Aalenian part of the Rydebäck Formation consists of black and variegated siltstones with a varying clay content showing a general regressive tendency, and the foraminiferal fauna is sparse compared to that of the underlying Lower Jurassic succession (Norling 1972).…”

Section: Middle Jurassic Fluvial and Paralic Depositionmentioning

confidence: 99%

Jurassic lithostratigraphy and stratigraphic development onshore and offshore Denmark

et al. 2003

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A complete updated and revised lithostratigraphic scheme for the Jurassic succession of the onshore and offshore Danish areas is presented together with an overview of the geological evolution. The lithostratigraphies of Bornholm, the Danish Basin and the Danish Central Graben are described in ascending order, and a number of new units are defined. On Bornholm, the Lower–Middle Jurassic coal-bearing clays and sands that overlie the Lower Pliensbachian Hasle Formation are referred to the new Sorthat Formation (Lower Jurassic) and the revised Bagå Formation (Middle Jurassic). In the southern Danish Central Graben, the Middle Jurassic succession formerly referred to the Lower Graben Sand Formation is now included in the revised Bryne Formation. The Lulu Formation is erected to include the uppermost part of the Middle Jurassic succession, previously referred to the Bryne Formation in the northern Danish Central Graben. The Upper Jurassic Heno Formation is subdivided into two new members, the Gert Member (lower) and the Ravn Member (upper). The organic-rich part of the upper Farsund Formation, the former informal ‘hot unit’, is established formally as the Bo Member. Dominantly shallow marine and paralic deposition in the Late Triassic was succeeded by widespread deposition of offshore marine clays in the Early Jurassic. On Bornholm, coastal and paralic sedimentation prevailed. During maximum transgression in the Early Toarcian, sedimentation of organic-rich offshore clays took place in the Danish area. This depositional phase was terminated by a regional erosional event in early Middle Jurassic time, caused by uplift of the central North Sea area, including the Ringkøbing–Fyn High. In the Sorgenfrei–Tornquist Zone to the east, where slow subsidence continued, marine sandy sediments were deposited in response to the uplift. Uplift of the central North Sea area was followed by fault-controlled subsidence accompanied by fluvial and floodplain deposition during Middle Jurassic time. On Bornholm, deposition of lacustrine muds, fluvial sands and peats dominated. The late Middle Jurassic saw a gradual shift to shallow marine deposition in the Danish Central Graben, the Danish Basin and Skåne, southern Sweden. During the Late Jurassic, open marine shelf conditions prevailed with deposition of clay-dominated sediments while shallow marine sands were deposited on platform areas. The Central Graben received sand by means of sediment gravity flows. The clay sediments in the Central Graben became increasingly rich in organic matter at the Jurassic–Cretaceous transition, whilst shallow marine coarse-grained deposits prograded basinwards in the Sorgenfrei– Tornquist Zone.

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“…Dadurch treten innerhalb der Schichtenfolge zahlreiche Schichtlücken und Diskordanzen auf (z.B. Ahlberg et al 2003;Abb. 2.2.2.1).…”

Section: Post-paläozoikumunclassified

“…Insgesamt resultierte daraus eine Sedimentation in vorwiegend brackischem Delta-bis flachmarinem Bereich (z.B. Ahlberg et al 2003). Dabei war das Klima im Jura durchgehend warm-humid.…”

Section: Post-paläozoikumunclassified