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A sporomorph ecogroup model for the Northwest European Jurassic - Lower Cretaceousi: concepts and framework
Abstract Based on recent vegetation distribution and an integration of macropalaeobotanical and palynological information, a palaeocommunity model is explored that may permit detailed interpretations
Life in the end-Permian dead zone
The significant time lag between terrestrial ecosystem collapse and selective extinction among characteristic Late Permian plants is documented, and the time-delayed, end-Permian plant extinctions resemble modeled “extinction debt” responses of multispecies metapopulations to progressive habitat destruction.
Environmental mutagenesis during the end-Permian ecological crisis.
It is document that the microspores of these lycopsids were regularly released in unseparated tetrads indicative of failure to complete the normal process of spore development, providing concrete evidence for chronic environmental mutagenesis at the time of global ecological crisis.
Abstract Paleoenvironmental and paleoclimatic conditions at Thale during the late Ladinian (Middle Triassic) are assessed using both the plant megaflora and palynoflora. These two datasets are
The Pollen Ultrastructure of Williamsoniella coronata Thomas (Bennettitales) from the Bajocian of Yorkshire
The exine ultrastructure of Williamsoniella coronata Thomas from the Bajocian of Yorkshire (United Kingdom) was investigated with light, scanning electron, and transmission electron microscopy, supporting the bennettitalean affinity of these dispersed pollen grains.
A sporomorph ecogroup model for the Northwest European Jurassic - Lower Cretaceous II : Application to an exploration well from the Dutch North Sea
Abstract Jurassic shallow marine to non-marine depositional sequences are among the most important economic targets in the North Sea. Detailed, ‘high resolution’ stratigraphy of these sequences has
Dated Phylogenies of the Sister Genera Macaranga and Mallotus (Euphorbiaceae): Congruence in Historical Biogeographic Patterns?
The two genera Macaranga and Mallotus show congruence in dispersal patterns, which corroborate divergence time estimates, although the overall mode and tempo of dispersal and diversification differ significantly as shown by distribution patterns of extant species.
New Ginkgophytes from the Upper Triassic–Lower Cretaceous of Spitsbergen and Edgeøya (Svalbard, Arctic Norway): The History of Ginkgoales on Svalbard
Ginkgophytes were thriving in Svalbard, which was already located above 60°N by the Carnian, from the Late Triassic to the Cenozoic in varying abundance and were finally extirpated, probably as a result of dramatic climatic changes at the end of the Paleogene.
A palaeoenvironmental reconstruction of the Middle Jurassic of Sardinia (Italy) based on integrated palaeobotanical, palynological and lithofacies data assessment
During the Jurassic, Sardinia was close to continental Europe. Emerged lands started from a single island forming in time a progressively sinking archipelago. This complex palaeogeographic situation
The type specimen of Nilssoniopteris solitaria (Phillips 1829) Cleal et P.M.Rees 2003 (Bennettitales)
Abstract We identified and located the type specimen of Scolopendrium solitarium, which is the basionym to what for decades was commonly referred to as “Nilssoniopteris vittata” and is now known as