Dr. Martina Dolezych | Senckenberg Forschunginstitut und Naturmuseum (original) (raw)

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Papers by Dr. Martina Dolezych

Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins

Geosphere, 2022

During the late Paleocene to early Eocene, clastic fluvial sediments and coals were deposited in ... more During the late Paleocene to early Eocene, clastic fluvial sediments and coals were deposited in northern high latitudes as part of the Margaret Formation at Stenkul Fiord (Ellesmere Island, Nunavut, Canada). Syn-sedimentary tectonic movements of the Eurekan deformation continuously affected these terrestrial sediments. Different volcanic ash layers occur, and unconformities subdivide the deposits into four sedimentary units. Rare vertebrate fossils indicate an early Eocene (Graybullian) age for the upper part of the Stenkul Fiord outcrop. Here, we present carbon isotope data of bulk coal, related organic-rich mud and siltstones, a plant leaf wax-derived alkane, and additional plant remains. These data provide a complete carbon isotope record of one stratigraphic section with defined unconformity positions and in relation to other Eurekan deformation features. A previously dated ash layer MA-1 provided a U-Pb zircon age of 53.7 Ma and is used as a stratigraphic tie point, together w...

Palaeontographica Abteilung B, 2021

In this study, we describe the fossil wood flora from the Chattian (late Oligocene) and Aquitania... more In this study, we describe the fossil wood flora from the Chattian (late Oligocene) and Aquitanian (early Miocene) deposits that crop out on the Tym River at Kompasky Bor, Russia. Twenty conifer and angiosperm wood taxa are described and a new fossil wood genus Thujopsoxylon gen. nov. and three new species are established: Thujopsoxylon schneiderianum sp. nov.; Piceoxylon nikitinii sp. nov.; and Crataegoxylon sibiricum sp. nov. The Kompasky Bor flora is important because it is the northernmost Chattian macroflora in the West Siberian Plain so far known and provides constraints on the timing and record of plant taxa migrations between Europe and the West Siberian Plain during the late Paleogene and the early Neogene. The fossil wood and macrofossil taxa are compared to European and other West Siberian Plain floras of similar age to understand the spatial and temporal relationships between these floras. The results of this multivariate analysis indicate floristic exchange between Europe and the West Siberian Plain was not prevalent, but much more pronounced between the West Siberian Plain and the Ural Mountains during the Rupelian and Chattian. Furthermore, elements of the polar broad-leaved deciduous forests appear to have occupied northern Europe and extended into the Ural Mountains and, despite the functionality of the lowland corridors between Europe and the West Siberian Plain, floristic exchange was not pronounced until Miocene time when climate became cooler and drier, signaling the onset of the evolution and development of boreal ecosystems in Europe and the West Siberian Plain.

International Journal of Coal Geology, 2020

Geological Society of America eBooks, Jun 14, 2019

Appendix A. Comparison of features of our Wiesa fossil wood Cedroxylon shakhtnaense comb. nov. an... more Appendix A. Comparison of features of our Wiesa fossil wood Cedroxylon shakhtnaense comb. nov. and extant woods of Abies sect. Abies (?, not stated; –, absent; +, present). The coding and terminology of Esteban et al. (2004) has been used.Appendix B. Comparison of features of our Wiesa fossil wood Cedroxylon shakhtnaense comb. nov. and extant woods of Abies sect. Nobilis Engelm. (?, not stated; –, absent; +, present). The coding and terminology of Esteban et al. (2004) has been used.Appendix C. Comparison of features of our Wiesa fossil wood Cedroxylon shakhtnaense comb. nov. and extant wood of Abies sect. Amabilis (?, not stated; –, absent; +, present). The coding and terminology of Esteban et al. (2004) has been used.Appendix D. Comparison of features of our Wiesa fossil wood Cedroxylon shakhtnaense comb. nov. and extant woods of Abies sect. Grandis Engelm. emend. Eckenwalder. (?, not stated; –, absent; +, present). The coding and terminology of Esteban et al. (2004) has been used...

Japanese Journal of Palynology

Date: August 28 Place: Room 5233 (oral) Organizers: Lutz Kunzmann, Martina Dolezych & Wilfrid Sch... more Date: August 28 Place: Room 5233 (oral) Organizers: Lutz Kunzmann, Martina Dolezych & Wilfrid Schneider Contact email address: Lutz.Kunzmann@senckenberg.de Purpose: Cenozoic conifers are often regarded as crucial for reconstructing of ancient ecosystems including lignite-forming swamp vegetation and mixed broad-leaved polar forests. The purpose of this symposium is to elucidate methods for palaeocological investigations and to evaluate their validity for the reconstruction of palaeoecosystems. Special focus will be on: (1) Taphonomical investigations: Plant taphonomy has a great potential for palaeoecological reconstructions. In-situ plants and (par-)autochthonous assemblages provide a direct insight into the structure of the ancient phytocoeneses. (2) Vegetational reconstruction: Cenozoic conifers are common in zonal mesophytic forests of nearly all palaeolatitudes as well as in azonal vegetationtypes including swamps and riparian forests. Not all of the fossil conifers may provide...

International Journal of Coal Geology, 2015

Abstract Geological investigations in the offshore area of eastern Russian Arctic attracted an in... more Abstract Geological investigations in the offshore area of eastern Russian Arctic attracted an increased interest in the recent years. Data concerning organic and coal petrology is scarce for the shelf and offshore area of the eastern Russian Arctic. Consequently, thermal maturity and depositional environments of sedimentary facies remain less described and examined. A detailed characterisation of organic matter type and origin as well as determination of thermal maturity have been carried out on siliciclastic and carbonate sedimentary samples from Paleozoic, Mesozoic and Cenozoic outcrops of the New Siberian Islands, eastern Russian Arctic. The acquired organic and coal petrological data contribute to the overall assessment of petroleum potential of the studied offshore area and the neighboring shelf area. The investigated organic matter of Silurian and Middle Devonian mudstones and siltstones contain distinct, multi-staged solid bitumen (“dead oil”) preserved either as fracture-, fissure-, and vein-fillings, indicating activation of migrations pathways for re-occurring crude oil-bearing fluids or in form of “streaks”. The examined dispersed organic matter of Triassic deposits is predominantly composed of terrestrially derived macerals followed by alginite macerals ( Tasmanite and Leiosphaeridia prasinophytes). The analysed Cretaceous and Tertiary deposits reveal (i) Aptian/Albian inertinite-rich sub-bituminous coal and lignites formed in fresh water lakes and swamps to brackish near-shore depositional environments with phases of wildfires as well as (ii) Cenomanian/Turonian lignites with pollen grains and carbonised debris (pyrofusinite), indicating stages of forest/moor paleofires. The (iii) Paleocene and Eocene deposits bear mineral-rich and xylite-rich lignites characterised by the lowest coal rank stage, containing different fossil conifer species. The thermal maturity of organic matter in Silurian to Tertiary deposits obtained from random vitrinite and bitumen reflectance measurements is an important parameter in determining the petroleum generation stage at the studied localities. The calculated thermal maturities of Silurian to Middle Devonian deposits acquired from random reflectance measurements of bitumen indicate condensate-wet gas to early dry gas generation window. The thermal maturities of sedimentary organic matter in samples collected from Tertiary to Triassic successions ranges from immature to main phase of oil generation. The composition of the organic matter and thermal maturity of the analysed Triassic siliciclastic deposits suggesting mature stage for oil generation can be used among others to evaluate their hydrocarbon potential. The Cretaceous and Tertiary deposits can be described as thermally immature. In two localities, where the thermal maturity is anomalously high, the examined organic matter has been thermally altered beyond the dry gas preservation limit.

Acta Palaeobotanica, 2014

ABSTRACTWe present the first anatomical description and taxonomic interpretation of macroscopic c... more ABSTRACTWe present the first anatomical description and taxonomic interpretation of macroscopic charcoal from the Late Miocene of the Staniantsi Coal Basin in western Bulgaria. The charcoal closely resembles the wood genus Taxodioxylon and thus can most likely be assigned to taxodioid Cupressaceae. This group of plants was part of the peat-forming swamp vegetation during generally drier periods, as shown by previous studies on palynomorphs from the basin. Our report presents the first solid evidence indicating which group of plants and probably which type of vegetation were affected by wildfires during deposition of the peat, although taxodioid Cupressaceae certainly were not the only group of plants affected by these fires; it also represents the first record of taxonomically identifiable palaeobotanical macroremains from the Staniantsi Basin.

IAWA Journal, 2021

We describe the first evidence of fossil Abies wood from the late early Miocene fossil plant asse... more We describe the first evidence of fossil Abies wood from the late early Miocene fossil plant assemblage of Wiesa in east Germany. The comparatively well-preserved piece of xylitic wood was recovered in the kaolin quarry at Hasenberg hill in Wiesa. The Wiesa assemblage is characterized as being allochthonous and partly parautochthonous mass deposits of diaspores, leaves, and wood. The latter component is rather incompletely studied so far. The described fossil is characterized by high rays, mostly uniseriate bordered pits, generally thick and pitted horizontal and tangential ray cell walls, but also partly smooth horizontal ray cell walls, absence of ray tracheids, the occurrence of traumatic resin canals, and rare occurrence of axial parenchyma of two types. This type of fossil wood has been described as Abietoxylon shakhtnaense Blokhina from the Oligo-Miocene of Sakhalin, Russia. Due to nomenclatural issues of Abietoxylon a recombination to Cedroxylon Kraus emend. Gothan is propose...

Feddes Repertorium, 2004

Aus dem miozänen Braunkohlentagebau Berzdorf in der Oberlausitz (Sachsen) werden erstmals autocht... more Aus dem miozänen Braunkohlentagebau Berzdorf in der Oberlausitz (Sachsen) werden erstmals autochthone Braunkohlenhölzer in großer Anzahl mit über 300 Fossilien beschrieben. Mit den Ergebnissen dieser Untersuchungen wird nachgewiesen, dass das Berzdorfer Braunkohlenmoor eine geringe phytofazielle Amplitude aufwies, sich jedoch unterschiedliche Vegetationsbereiche ausgebildet hatten. Es stellt sich heraus, dass die von der Niederlausitz bekannten Vegetationen auch in stratigraphisch älteren Braunkohlenablagerungen vorkommen. Die xylotomischen Ergebnisse führen zur Deklarierung des Berzdorfer Kohlenkomplexes als Glyptostrobus/Sequoia‐Typus.Eine biostratigraphische Korrelierung dieses isolierten terrestrischen Braunkohlenvorkommens von Berzdorf mit den sequenz‐ und biostratigraphisch gut eingestuften Niederlausitzer Flözen war möglich. Verschiedene, für diese Region neue Holzarten wurden festgestellt: Glyptostroboxylon tenerum, G. rudolphii sp. nova, Taxodioxylon gypsaceum, T. germanicu...