Results 21 to 30 of about 496,670 (387)
The First Galaxies and the Likely Discovery of their Fossils in the Local Group [PDF]
, 2009 In cold dark matter cosmologies, small mass halos outnumber larger mass halos at any redshift. However, the lower bound for the mass of a galaxy is unknown, as are the typical luminosity of the smallest galaxies and their numbers in the universe.
Ricotti, Massimo
core +3 more sources
Earth's earliest and deepest purported fossils may be iron-mineralized chemical gardens
Proceedings of the Royal Society B, 2019 Recognizing fossil microorganisms is essential to the study of life's origin and evolution and to the ongoing search for life on Mars. Purported fossil microbes in ancient rocks include common assemblages of iron-mineral filaments and tubes.
S. McMahon
semanticscholar +1 more source
How Technology Has Thrown Us Out of Balance with Nature and Why We Need to Get Back In
Molecular Frontiers Journal, 2020 We have created a technology-based environment in an effort to control our world, but we need to understand that the biological forces that shaped us continue to play a role in our future. As more and more species go extinct because of human activity, we
Donald Johanson
doaj +1 more source
Bioessays, 2018 Exceptionally preserved fossils are the product of complex interplays of biological and geological processes including burial, autolysis and microbial decay, authigenic mineralization, diagenesis, metamorphism, and finally weathering and exhumation ...
L. Parry +9 more
semanticscholar +1 more source
A Field Guide to Finding Fossils on Mars
Journal of Geophysical Research - Planets, 2018 The Martian surface is cold, dry, exposed to biologically harmful radiation and apparently barren today. Nevertheless, there is clear geological evidence for warmer, wetter intervals in the past that could have supported life at or near the surface. This
Sean McMahon +10 more
semanticscholar +1 more source
Preservation of Arctic dinosaur remains from the Prince Creek Formation (Alaska, USA): A reply to Fiorillo (2016) [PDF]
Acta Palaeontologica Polonica, 2016 We thank Anthony Fiorillo (2016) for the concerns he raised regarding our characterizations of the Liscomb bonebed fossils in our paper describing Ugrunaaluk kuukpikenis from the Prince Creek Formation of Alaska, USA (Mori et al. 2016). We did not
Hirotsugu Mori +2 more
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Congruence, fossils and the evolutionary tree of rodents and lagomorphs
Royal Society Open Science, 2019 Given an evolutionary process, we expect distinct categories of heritable data, sampled in ever larger amounts, to converge on a single tree of historical relationships.
R. Asher +3 more
semanticscholar +1 more source
Survival of fossils under extreme shocks induced by hypervelocity impacts [PDF]
, 2014 Experimental data are shown for survival of fossilized diatoms undergoing shocks in the GPa range. The results were obtained from hypervelocity impact experiments which fired fossilized diatoms frozen in ice into water targets.
Burchell, Mark J. +3 more
core +1 more source
Diversity, 2022 Elasmobranchii are relatively well-studied. However, numerous phylogenetic uncertainties about their relationships remain. Here, we revisit the phylogenetic evidence based on a detailed morphological re-evaluation of all the major extant batomorph clades
Eduardo Villalobos-Segura +6 more
doaj +1 more source
BioScience, 2018 Biologists would be mistaken if they relegated living fossils to paleontological inquiry or assumed that the concept is dead. It is now used to describe entities ranging from viruses to higher taxa, despite recent warnings of misleading inferences ...
S. Lidgard, A. Love
semanticscholar +1 more source