Carboniferous palynoevents in the circum-Arctic region

Mangerud, Gunn; Lopas, Gilda; Bujak, J P

doi:10.4138/atlgeol.2021.003

Cited by 2 publications

(3 citation statements)

References 31 publications

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“…Maiaspora concava is recorded from the Potoniesporites delicatus Subzone of the Finnmark Platform (Lopes et al 2018a), and from the correlative 'interval B' of the Loppa High (Lindstr€ om 2003). These also correlate with the TC Biozone (Clayton 1985;Mangerud et al 2021). On Spitsbergen, M. concava is recorded in an assemblage from the Sergeijevfjellet Formation dated no older than late Visean (V3) (Krajewski & Stempie n-Sałek 2003).…”

Section: Evolutionary Implicationsmentioning

confidence: 56%

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Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Mamontov,

McLean,

Gavrilova

2024

Papers in Palaeontology

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The Palaeozoic origin of gleichenioid ferns (Gleicheniales) has aroused curiosity for almost a century. The oldest definite sign of this ancient clade is the spore wall ultrastructure of Radiitheca dobranyana from the Moscovian of central Europe. However, familial assignment of this fern fossil is uncertain. A comparison of its in situ spores with those of the dispersed genus Maiaspora, from the Visean, suggests that they may represent the same group of leptosporangiates. Although these spores have a common metareticuloid sculpture, the ultra‐thin structure of the dispersed counterparts remained unknown. Study of the ultrastructure of Maiaspora concava and M. panopta from central Russia and Northumberland (UK) using transmission electron microscopy shows that the wall of Maiaspora has a middle exospore layer composed of foliated lamellae. These spread from the base of the aperture slit to the subequatorial margins of kyrtome areas. The lamellae do not overlap the aperture slit and terminate at between two‐thirds and three‐quarters of the slit height. The miospores have a three‐layered exospore in the interradial areas, while non‐apertural parts of the exospore consist of two layers. Such an ultrastructure is shared by extant Gleicheniales and fossil R. dobranyana. The combined evidence from the morphology, ultrastructure and spatiotemporal distribution of Maiaspora, as well as radioisotope dating and additional plant macrofossils, suggests that the origin of the Gleicheniales stem was related to closure of the Rheic Ocean. Apparently, the first Maiaspora‐producing gleichenioids emerged as neoendemic terrestrial ferns on the peri‐Gondwanan volcanic arcs.

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Section: Evolutionary Implicationsmentioning

confidence: 56%

“…These also correlate with the TC Biozone (Clayton 1985; Mangerud et al . 2021). On Spitsbergen, M. concava is recorded in an assemblage from the Sergeijevfjellet Formation dated no older than late Visean (V3) (Krajewski & Stempień‐Sałek 2003).…”

Section: Discussionmentioning

confidence: 99%

Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Mamontov,

McLean,

Gavrilova

2024

Papers in Palaeontology

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“…If a relationship with an independent fossil horizon cannot be identified, then a similar relationship with the base of a chronostratigraphic unit is employed. Thus, in Mangerud et al (2021a), the FO of the spore Columinisporites heyleri is documented as the base of the Moscovian Stage; and the LO of the spore Microreticulatisporites nobilis is documented as 80% above the base of the Moscovian.…”

Section: Event-biostratigraphic Approach and Timescale Creatormentioning

confidence: 99%

Introduction to the “Circum-Arctic Palynological Event Stratigraphy” (CAPE) series of papers

Bujak¹,

Fensome

Mangerud

et al. 2021

atgeol

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Palynomorphs are one of the few groups of fossils that provide biostratigraphic control in marine to nonmarine rocks and can be applied as proxies for paleoenvironmental and paleoclimatic interpretations. Their utility is enhanced by their microscopic size, which is usually less than 200 micrometres; they are thus easily recovered from small rock samples. They occur throughout the Phanerozoic and are therefore invaluable in refining biostratigraphic control of Arctic successions in Alaska, Arctic Canada, Greenland, northern Europe, and northern Russia. The objective of the Circum-Arctic Palynological Event (CAPE) Stratigraphy series of papers is to integrate data published on Arctic palynomorphs to delineate palynological events (palynoevents) across the Arctic for the Silurian to Cenozoic. Once the series of papers is complete, the data will also be used to compile a TimeScale Creator datapack that can be updated and calibrated on an ongoing basis. Palynoevents include taxon originations (first occurrences or FOs) and extinctions (last occurrences, or LOs) and some abundance events. The palynoevents are correlated with established chronostratigraphic horizons such as bases of ammonoid zones or stages, and hence their chronostratigraphy is independent of the absolute time scale in millions of years. In addition to the palynostratigraphic papers, the series includes a paper detailing the paleogeography of the circum-Arctic regions, including informative maps, as well as a paper providing a palynological perspective of the Cenozoic shift from greenhouse to icehouse conditions.

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Carboniferous palynoevents in the circum-Arctic region

Cited by 2 publications

References 31 publications

Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Maiaspora: the hallmark of gleichenioid ferns (Gleicheniales) from the early Carboniferous

Introduction to the “Circum-Arctic Palynological Event Stratigraphy” (CAPE) series of papers

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