Results 21 to 30 of about 486,715 (397)

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

Analisis Sisa Gajah Dari Kecamatan Tamban, Kabupaten Batola (Kalimantan Selatan): Suatu Pengumuman

Berkala Arkeologi, 1989
Dalam tahun 1987 Pusat Penelitian Arkeologi Nasio­nal diminta untuk mengoreksi suatu temuan yang baru dilakukan oleh Bidang Permuseuman Sejarah dan Purba­kala Kantor Wilayah Departemen Pendidikan dan Kebu­dayaan Propinsi Kalimantan Selatan.
Rokus Due Awe
doaj   +1 more source

Where are the Fossils of the First Galaxies? I. Local Volume Maps and Properties of the Undetected Dwarfs [PDF]

, 2010
We present a new method for generating initial conditions for LCDM N-body simulations which provides the dynamical range necessary to follow the evolution and distribution of the fossils of the first galaxies on Local Volume, 5-10 Mpc, scales.
Babul, Begum, Belokurov, Belokurov, Bovill, Bullock, Cole, de Jong, Diemand, Efstathiou, Eisenstein, Frebel, Frebel, Geha, Giovanelli, Gnedin, Gnedin, Irwin, Kallivayalil, Kirby, Kirby, Klypin, Knollmann, Koposov, Kormendy, Kravtsov, Majewski, Martinez, Massimo Ricotti, Mia S. Bovill, Navarro, Norris, Peñarrubia, Peñarrubia, Quinn, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Saigo, Shetrone, Shull, Simon, Simon, Susa, Tollerud, Tolstoy, Tormen, van der Marel, Venkatesan, Walker, Walsh, Walsh, Willman, Willman, Willman, Wise, Wolf, Zucker, Zucker   +60 more
core   +1 more source

Soft‐Bodied Fossils Are Not Simply Rotten Carcasses – Toward a Holistic Understanding of Exceptional Fossil Preservation

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, Fiann M. Smithwick, K. Nordén, E. Saitta, J. Lozano-Fernandez, Alastair R. Tanner, Jean‐Bernard Caron, G. Edgecombe, D. Briggs, J. Vinther   +9 more
semanticscholar   +1 more source

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

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, Sean McMahon, Tanja Bosak, J. Grotzinger, R. Milliken, R. Summons, Mirna Daye, S. Newman, A. Fraeman, Kenneth H. Williford, Derek E. G. Briggs   +10 more
semanticscholar   +1 more source

The Messel Pit: Window into a Greenhouse World [PDF]

Geoconservation Research, 2021
Anthropogenic climate change may result, within 200 years, in warm and equable climatic conditions not experienced on Earth for tens of millions of years. Ancient ecosystems under such “greenhouse” conditions may be seen as natural experiments, and their
Krister Smith
doaj   +1 more source

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, Martin R. Smith, Aime H. Rankin, R. Emry   +3 more
semanticscholar   +1 more source

The central elliptical galaxy in fossil groups and formation of BCGs [PDF]

, 2006
We study the dominant central giant elliptical galaxies in ``Fossil groups'' using deep optical (R-band) and near infrared (Ks-band) photometry. These galaxies are as luminous as the brightest cluster galaxies (BCGs), raising immediate interest in their ...
Jones, Laurence R., Khosroshahi, Habib G., Ponman, Trevor. J.   +2 more
core   +3 more sources

Rethinking Living Fossils

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