Julia Gravendyck- Dr. rer. nat.
- Lecturer at University of Bonn
Julia Gravendyck
- Dr. rer. nat.
- Lecturer at University of Bonn
About
28
Publications
7,575
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Introduction
Palynologist and Botanist focussing on palynology of the Mesozoic; applying and revising taxonomy, nomenclature; looking at teratology, paleoecology, the evolution of early angiosperms and other palynolgical enigmas
Current institution
Additional affiliations
April 2021 - November 2022
Position
- Research Assistant
Description
- Working on the DFG project "Deciphering the very early phase of angiosperm evolution using palynology"
March 2017 - March 2021
March 2017 - March 2021
Position
- Research Assistant
Description
- PhD studies in collaboration with the university of Oslo investigating the vegetation dynamics of the Triassic-Jurassic transition in Bonenburg based on the palynoflora.
Publications
Publications (28)
Stratigraphic studies are an integral component in understanding the chronology of events that led to the end-Triassic mass extinction, by resolving causal relationships between environmental upheavals and biotic response. Successful correlation of Triassic–Jurassic (Tr–J) successions is complicated by the disappearance of macro-fossils that are ot...
https://authors.elsevier.com/a/1bnkz3HcE1cwpG
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The end-Triassic mass extinction is often linked to...
Effective communication of taxonomic concepts is crucial to meaningful application in all biological sciences, and thus the development and following of best practices in taxonomy and the formulation of clear and practical rules of nomenclature underpin a wide range of scientific studies. The International Code of Nomenclature for algae, fungi and...
The important marker species for the base of the Jurassic, Cerebropollenites thiergartii, occurs contemporaneously with at least nine related taxa. However, their distinction is difficult and has been confused in the past. In addition, a long history of numerous recombinations with different genus names (e.g. Tsugaepollenites and Sciadopityspolleni...
The nomenclature and status of the fossil-genus Sparganiaceaepollenites Thiergart 1937 and several of its species are problematic. We confirm the status of the genus and provide an emended description for it to accommodate new characters that were recently described in some species. We note that 1) the name Sparganiaceaepollenites microreticulatus...
The timing of the origin of angiosperms is a long-standing topic of debate in plant evolution. Different disciplines and approaches provide highly variable age estimates. It is generally accepted, that early macro-and mesofossils showing unequivocal angiosperm features occur in lower Ap-tian deposits. Workers employing palynology, i.e., the extreme...
Franz et al. (2023) report a diverse and three-dimensionally preserved suite of mid-Proterozoic microfossils from miarolitic cavities within the granitic Volyn pegmatite field, a major granitic plutonic complex in NW Ukraine. The biota is dated at between ∼ 1.76 and ∼ 1.5 Ga and includes fungus-like objects. This biota is reported as evidence of or...
In the Lower Saxony Basin (LSB) of Northern Germany, the earliest Cretaceous (Berriasian, “German Wealden”) is represented by organic-rich shales assigned to the Isterberg Fm., which have been deposited under brackish-lacustrine conditions in a partially restricted basin. Towards the southern basin margin, these shales interfinger with nearshore sa...
Franz et. al. (Biogeosciences 20, 1901–1924, 2023) report a diverse and three-dimensionally preserved suite of mid-Proterozoic microfossils from miarolotic cavities within the granitic Volyn pegmatite field, a major granitic plutonic complex in NW Ukraine. The biota is dated at between ~1.76 Ga and ~1.5 Ga and includes fungus-like objects. This bio...
New palynological and geochemical data from the KB Rehburg-2 core covering the German Wealden (W1-4) illustrate the unique development of this depositional setting. Despite the temporary isolation of the Lower Saxony Basin (LSB) from the open ocean, several marine flooding events into the basin were detected. Marine ingressions are suggested to hav...
The debated vegetation response to climate change can be investigated through palynological fossil records from past extreme climate conditions. In this context, the early Eocene (53.3 to 41.2 million years ago (Ma)) is often referred to as a model for a greenhouse Earth. In the Xining Basin, situated on the North-eastern Tibetan Plateau (NETP), th...
During the Early Cretaceous (Berriasian; ‘German Wealden’), the Lower Saxony Basin (LSB) in northern Germany was characterized by non-marine deposits in a restricted intercontinental setting (Schneider et al. 2017). New insights into these Lower Cretaceous sedimentary rocks can be gained from a recently drilled core (KB Rehburg-2, Lower Saxony, Ger...
Pollen and spores were recovered from the Paleocene Fort Union Formation and Paleocene–Eocene Willwood Formation of the Bighorn Basin (BHB), northwestern Wyoming, USA. In many local stratigraphic sections in the BHB, the base of the Eocene has been identified by the characteristic negative carbon isotope excursion (CIE) that marks the beginning of...
The timing of the origins of angiosperms is a long-standing topic of debate in plant evolution. Different disciplines and approaches provide highly variable age estimates. It is generally accepted, that early macro- and mesofossils showing unequivocal angiosperm features occur in lower Aptian deposits. The oldest widely accepted fossilized flowers...
A major and recurrent issue in nomenclature and taxonomy is synonymy and the occurrence of competing names for a taxon. Formal proposals for conservation, protection, or rejection of names are a painstaking but necessary work, which for extant plants, often requires consulting the frequency of use of competing names in floras. In palaeopalynology,...
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An overview of the history of a taxon name and its current status are critical in taxonomy; and select...
The overarching aim of this thesis was to integrate the Bonenburg section and its extremely well- preserved palynoflora within the existing framework of end-Triassic records, and describe and compare its paleoenvironmental changes and vegetation history during the end-Triassic mass extinction.
In the outcrop of Bonenburg in Western Germany...
This is a biography and obituary of the German Democratic Republic palynologist Dr Eberhard Schulz (1931–2017). A pioneer in Mesozoic palynology, he established, together with other important palynologists of that time, the basis of today’s palynological research, especially in the Triassic and Jurassic of Eastern Germany. His comprehensive range c...
A disturbed spore/pollen production can result in increased amounts of abnormal spores or pollen. Usually, this is linked to naturally occurring environmental stress in the mother plant due to sudden changes related to weather, e.g. draught, water logging, temperature changes, in which case the environmental stress is seasonal and may only affect p...
