Structures resembling remarkably preserved bacterial and cyanobacterial microfossils from3,465-million-year-old Apex cherts of the Warrawoona Group in Western Australiacurrently provide the oldest morphological evidence for life on Earth and have been taken to support an early beginning for oxygen-...
Although it is not known when or where life on Earth began, some of the earliest habitable environments may have been submarine-hydrothermal vents. Here we describe putative fossilized microorganisms that are at least 3,770 million and possibly 4,280 million years old in ferruginous sedimentary roc...
Erratum: Evidence for life on earth before 3,800 million years ago (Nature (1996) 384 (55-59)) Reports ion-microprobe measurements of the carbon-isotope composition of carbonaceous inclusions within grains of apatite from the oldest known sediment se... S Mojzsis,G Arrhenius,K Mckeegan,.....
Evidence for life on earth more than 3850 million years ago. Focuses on the discovery of microorganisms in the 3450-million -year-old Warrawoona sedimentary rocks of northwestern Australia. Importance of the morpholo... Holland,Heinrich,D. - 《Science》...
Projections of duration of life for humans based on mathematical models have led some researchers to claim that there is no lower limit to death rates or upper limit to life expectancy, and that a life expectancy of 100 will be achieved in the 21st century. To assess the biological plausibili...
Earth and Mars: Evolution of Atmospheres and Surface Temperatures Solar evolution implies, for contemporary albedos and atmospheric composition, global mean temperatures below the freezing point of seawater less than 2.3 ... C Sagan,G Mullen - 《Science》 被引量: 829发表: 1972年 Correlation between...
A 40-mile stretch of a long-gone branch of the Nile may explain why the ancient monuments were built where they were.
Here we reexamine some old data of the K-p→Λπ+π- reaction and find that besides the well-established Σ*(1385) with JP=3/2+, there is indeed some evidence for the possible existence of a new Σ* resonance with JP=1/2- around the same mass but with broader decay width. Higher...
Genesis of ferromanganese deposits diagnostic criteria for recent and old deposits[M]. New York: Plenum Press, 1983. Google Scholar [9] TAYLOR S R, MCLENNAN S M. The continental crust: its composition and evolution: an examination of the geochemical record preserved in sedimentary rocks[M...
Coastal conglomerates around the Hadjer el Khamis inselbergs (western Chad, Central Africa): new evidence for Lake Mega-Chad episodes Earth Surface Processes and Landforms, 28 (10) (2003), pp. 1059-1069 View in ScopusGoogle Scholar Servant and Servant, 1983 M. Servant, S. Servant Paleolimnolog...