Results 11 to 20 of about 23,892 (256)
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
Seeds, 2023 Physical dormancy (PY) due to a water-impermeable seed/fruit coat is one of the characteristic features of many species of Fabaceae; however, the timing and context of the evolution of this trait are poorly understood.
Ganesh K. Jaganathan, Keith Berry
doaj +1 more source
Insect frass in Baltic amber [PDF]
Bulletin of the Geological Society of Finland, 2008 Inclusions of wood debris loosened from pine-like trees are abundant in Baltic amber of Eocene and Oligocene age. The possibilities to find insect frass and excrement among wood debris are outlined and some examples are given.
M. Nuorteva, K.A. Kinnunen
doaj +1 more source
Fossilized bioelectric wire – the trace fossil Trichichnus [PDF]
Biogeosciences, 2014 Abstract. The trace fossil Trichichnus is proposed as an indicator of fossil bioelectric bacterial activity at the oxic–anoxic interface zone of marine sediments. This fulfils the idea that such processes, commonly found in the modern realm, should be also present in the geological past.
Kȩdzierski, M. +3 more
openaire +6 more sources
Geology Today, 2008 Possibly every palaeontologist, before and after Charles Darwin, has been well aware that the fossil record is very incomplete. Only a tiny percentage of the plants and animals alive at any one time in the past get preserved as fossils, both in terms of numbers of individuals and in terms of numbers of species.
Nudds, J.R., Selden, P.A.
openaire +2 more sources
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
Geo&Bio, 2019 The palaeontological collection of the Geological Department of the National Museum of Natural History NAS of Ukraine (NMNH NASU) is among the most valuable objects of the national scientific and cultural heritage. The article presents a brief analytical
G. V. Anfimova +3 more
doaj +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
doaj +1 more source
Rates and Rocks: Strengths and Weaknesses of Molecular Dating Methods
Frontiers in Genetics, 2020 I present here an in-depth, although non-exhaustive, review of two topics in molecular dating. Clock models, which describe the evolution of the rate of evolution, are considered first.
Stéphane Guindon
doaj +1 more source
A Revised Phylogenetic Classification for Viola (Violaceae)
Plants, 2022 The genus Viola (Violaceae) is among the 40–50 largest genera among angiosperms, yet its taxonomy has not been revised for nearly a century. In the most recent revision, by Wilhelm Becker in 1925, the then-known 400 species were distributed among 14 ...
Thomas Marcussen +5 more
doaj +1 more source