As a key nutrient, nitrogen can limit primary productivity and carbon cycle dynamics, but also evolutionary progress. Given strong redox-dependency of its molecular speciation, environmental conditions control localization bioavailability. This particularly applies to periods in Earth history with frequent redox fluctuations, such as the Neoproterozoic. We here report on chlorophyll-derived por...

Carbonate rocks of Neoproterozoic to Silurian age are abundantly distributed around the coasts North and North-East Greenland. Palaeokarst horizons particularly well developed within Portfjeld Formation (Ediacaran – earliest Cambrian) beneath Buen (Cambrian Series 2), there caves Ordovician limestones infilled by Caledonian molasse Middle Devonian age. The youngest karst is a series from Hall L...

Establishing the timescale of early land plant evolution is essential for testing hypotheses on the coevolution of land plants and Earth's System. The sparseness of early land plant megafossils and stratigraphic controls on their distribution make the fossil record an unreliable guide, leaving only the molecular clock. However, the application of molecular clock methodology is challenged by the...

After its Ediacaran-Early Cambrian assembly, Gondwana was flanked by a system of peripheral orogens, Terra Australis, Avalonian-Cadomian and newly defined North Indo-Australie, which display broad temporal correlations their lithotectonic records. Prior to initial histories were primarily controlled the early Neoproterozoic breakup Rodinia with second order variances reflecting differing relati...

Abstract The Sichuan Basin was a part of the Yangtze Carbonate Platform (YCP) during Cambrian–Ordovician, and marine carbonates were deposited in basin this interval. Although previous studies have evaluated paleogeography, paleoclimate paleoecology basin, they primarily focused on biological evolution basin; however, analysis paleogeography is lacking. This study integrated outcrop sedimentolo...

Three small assemblages of lower Cambrian (Cambrian Series 2, Stage 4) shelly fossils are described from Laurentian strata astride Nares Strait. The fauna the Humboldt Formation Daugaard-Jensen Land, North Greenland, is derived inner shelf sediments deposited on stable craton Inglefield Land High. Fossils Judge Daly Promontory, eastern Ellesmere Island, Nunavut, occur in Group (Kane Basin Forma...

The position of South China in Gondwana remains controversial. In all previous models, the Yangtze and Cathaysia blocks, two major components China, were amalgamated by Tonian, was considered to be a single coherent block Gondwana. Based on summary critical reevaluation available paleomagnetic, paleontological, stratigraphic, detrital zircon data, we propose that blocks not juxtaposed until ear...

U/Pb ages of detrital zircon from two samples Ordovician sediments were determined and, based on similar published data, compared with xenocrystal inheritance Triassic and Oligocene granitoids the Cordillera Real in order to better understand their genetic relationship sources. The results show that sandstone inherited cores are statistically correlated. This correlation suggests assimilation t...