Results 291 to 300 of about 115,566 (343)
Is Strudiella a Devonian insect? [PDF]
Nature, 2013 Arising from R. Garrouste et al. , 82–85 (2012)10.1038/nature11281 The origin of winged insects (Pterygota), one of the planet’s most diverse lineages of organisms, is assumed to lie in the Devonian, but as an extremely sparse fossil record impedes our understanding of their early diversification ...
Thomas Hörnschemeyer +2 more
exaly +4 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Nature, 2003
Perhaps the most enduring of puzzles in palaeontology has been the identity of Palaeospondylus gunni Traquair, a tiny (5-60-mm) vertebrate fossil from the Middle Devonian period (approximately 385 Myr ago) of Scotland, first discovered in 1890 (refs 1-3). It is known principally from a single site (Achanarras Quarry, Caithness) where, paradoxically, it
Mark D Sutton
exaly +4 more sources
Perhaps the most enduring of puzzles in palaeontology has been the identity of Palaeospondylus gunni Traquair, a tiny (5-60-mm) vertebrate fossil from the Middle Devonian period (approximately 385 Myr ago) of Scotland, first discovered in 1890 (refs 1-3). It is known principally from a single site (Achanarras Quarry, Caithness) where, paradoxically, it
Mark D Sutton
exaly +4 more sources
A tetrapod fauna from within the Devonian Antarctic Circle
Science, 2018Out of Antarctica When we think of Devonian tetrapods, the ancestors of all modern vertebrates, we tend to picture amphibian-like creatures emerging from the water into a wet tropical forest or swamp.
R. Gess, P. Ahlberg
semanticscholar +1 more source
Geological Society, London, Special Publications, 1964
Summary A review of the radiometric evidence suggests that the top of the Devonian should be dated at about 345 m.y. and the base of the system at about 395 m.y. Using cumulative thickness methods the age of the base of the Upper Devonian is estimated at 358 m.y. and that of the base of the Middle Devonian at 370 m.y.
Peter Furneaux Friend, Michael R. House
openaire +2 more sources
Summary A review of the radiometric evidence suggests that the top of the Devonian should be dated at about 345 m.y. and the base of the system at about 395 m.y. Using cumulative thickness methods the age of the base of the Upper Devonian is estimated at 358 m.y. and that of the base of the Middle Devonian at 370 m.y.
Peter Furneaux Friend, Michael R. House
openaire +2 more sources
Devonian magmatism in the accretionary complex of southern Chile
Journal of the Geological Society, 2016Supposed or potential Devonian igneous rocks in the accretionary complex of southern Chile were investigated using sensitive high-resolution ion microprobe U–Pb dating of zircon, with Hf- and O-isotope analyses of selected grains. Ages of 384 ± 3 and 382
F. Hervé +8 more
semanticscholar +1 more source
Mudrocks of the Devonian [PDF]
Quarterly Journal of Engineering Geology, 1981 Introduction Around the close of the Silurian, but with associated igneous and volcanic events lasting well into the Devonian, occurred the major phase of the Caledonian Orogeny. The main mountain belt resulting from this, stretched from the joined area of Spitsbergen, E Greenland and Norway SE for some 4000 km, the belt being up to 600 km in
openaire +1 more source
Geological Magazine, 1924
My attention has recently been called to some very interesting comments on the problem of the delimitation of the Silurian and Devonian systems, which were made by Dr. Elles in her Presidential address to Section C of the British Association at Liverpool.
openaire +2 more sources
My attention has recently been called to some very interesting comments on the problem of the delimitation of the Silurian and Devonian systems, which were made by Dr. Elles in her Presidential address to Section C of the British Association at Liverpool.
openaire +2 more sources
A Devonian Trilobite with an Eyeshade
Science, 2003Trilobites include the oldest species with preserved eyes for which detailed optical mechanisms have been suggested. They appear in the Cambrian, and in comparison to other species present then, trilobites already had unusually sophisticated eyes with lenses made out of the mineral calcite ( [1 ...
Brian Chatterton, Richard A. Fortey
openaire +3 more sources
Thermophysical Properties Of Devonian Shales
SPE Annual Technical Conference and Exhibition, 1979Abstract A detailed study of the thermophysical properties of Devonian shales from the central and eastern United States has been carried out. The properties encompass a wide spectrum of material properties such as thermal conductivity, thermal diffusivity, specific heat, dielectric constant and sonic velocities ...
Joel B. DuBow, Krishnan Rajeshwar
openaire +3 more sources