ArticleAnnals of botany2026
Earliest Jurassic plant assemblages from Sweden reveal a low-diversity ginkgoalean and cheirolepid flora dominating the post-extinction landscape.
Article in Annals of botany, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
BACKGROUND AND
aimsRich Triassic-Jurassic plant assemblages from Skåne, southern Sweden, have been documented extensively over the past two centuries. However, no macrofloras from the lowermost part of the Helsingborg Member (Lower Jurassic) have been forthcoming and thus the age of the successions has not been well constrained. Here we systematically describe and assess the palaeoecology and age of a newly discovered flora from the Boserup beds at Norra Albert Quarry, Skåne.
methodsPlant macrofossils were examined using macrophotography, fluorescence microscopy and scanning electron microscopy. Palynological analysis of the strata hosting the macroflora contributed to the palaeoenvironmental interpretations and refined the age of the deposits.
resultsThe low-diversity post-extinction recovery forests of the earliest Jurassic were dominated by ginkgoopsids, cheirolepid conifers and ferns, growing under seasonal mesothermal conditions. Dispersed charcoal indicates wildfires were present in the landscape at this time.
conclusionsDespite the poor preservation of the fossils, the Boserup beds flora provides a window into vegetation recovery in the immediate aftermath of the end-Triassic extinction event. Initial recovery is characterized by the presence of needle- and scale-leafed seed plants (notably czekanowskialeans and Brachyphyllum species that produced Classopollis pollen), along with a range of ground ferns.
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