Results 11 to 20 of about 4,277 (208)
Sedimentary Mercury Enrichments as a Tracer of Large Igneous Province Volcanism
Geophysical Monograph Series, Page 247-262., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Lawrence M. E. Percival +3 more
wiley +6 more sources
Can Macroevolution Inform Contemporary Extinction Risk? [PDF]
Ecol LettWe investigate the underlying assumptions of the idea that macroevolutionary indicators for large groups of species, such as rates of extinction, diversification or niche evolution, can inform species' current and future extinction risk status. We find that only past extinction rates can be reliable predictors of current extinction risk as the same ...
Weil SS +4 more
europepmc +2 more sources
MINERAL COMPOSITION AND STRUCTURAL FEATURES OF JEWELER AMMONITES FROM KOSTROMA REGION
Известия высших учебных заведений: Геология и разведка, 2017 Detailed mineralogical examination of ammonites of jewelry quality has been carried out by means of radiographical, X-ray microanalyses and electronic microscopy.
D. A. Petrochenkov
doaj +1 more source
Geological Magazine, 1919 The variability and occasional instability of the Ammonoid suture-line, to which attention has been drawn, the recurrence of similar types, and the frequent asymmetry of the opposing halves of a given suture-line, which is apparent not only in the Dactylioceras commune, figured by Swinnerton & Trueman (fig. 9 on p.
openaire +2 more sources
Geological Magazine, 1920 It is well known that the chambers of Cephalopod shells are connected by an organ called the siphuncle, which passes through the septa by the septal necks. Many investigators who have studied these shells have made careful observations on the siphuncle, hoping thereby to throw light on its functions.
openaire +4 more sources
The Turonian-Coniacian deposits of the south-west of the Ulyanovsk-Saratov trough
Известия высших учебных заведений: Геология и разведка, 2019 Integrated study of a series of the Turonian and Coniacian complete geological records has revealed the stratigraphic completeness and specified the faunal contents of the deposits.
E. M. Pervushov +4 more
doaj +1 more source
The Cretaceous/Paleogene (K/Pg) boundary in the Mezdra and Lyutidol syncline, Vratza District (West-Fore Balkan, Bulgaria) [PDF]
Geološki Anali Balkanskoga Poluostrva, 2006 This paper discusses the unjustified assignment (based on calcareous nannofossils) of a large portion of the Maastrichtian strata in the Mezdra and Lyutidol synclines (West Fore Balkan, Bulgaria) to the Paleogene.
Jolkičev Nikola A.
doaj +1 more source
Известия высших учебных заведений: Геология и разведка, 2023 Background. Along with ammonites and septaries, concretions with fossils are increasingly being used as jewelry and ornamental materials in Russia. Such concretions are characterized by a wide range of sizes, as well as high decorative and technological ...
D. A. Petrochenkov, E. Yu. Baraboshkin
doaj +1 more source
Geologica Carpathica, 2014 Upper Jurassic marine deposits are either rarely preserved due to erosion or buried under younger sediments in the Bohemian Massif. However, fossil assemblages from a few successions exposed in northern Bohemia and Saxony and preserved in museum ...
Hrbek Jan
doaj +1 more source
An ammonite trapped in Burmese amber [PDF]
Proceedings of the National Academy of Sciences, 2019 SignificanceAquatic organisms are rarely found in amber, but when they occur they provide invaluable evidence for the better understanding of amber taphonomy and past ecosystems. We report an ammonite and several marine gastropods alongside a mixed assemblage of intertidal and terrestrial forest floor organisms in mid-Cretaceous Burmese amber.
Jim Kennedy +11 more
openaire +3 more sources