نتایج جستجو برای: trace fossil

تعداد نتایج: 91986  

2015
Edward B. Daeschler

The stratifi ed red beds of the Catskill Formation are conspicuous in road cut exposures on the Allegheny Plateau of north-central Pennsylvania. During this fi eld trip we will visit and explore several fossil localities within the Catskill Formation. These sites have been central to recent investigations into the nature of Late Devonian continental ecosystems. By the Late Devonian, forests wer...

2005
M. Sponheimer

Elemental ratio data from archaeological and paleontological bone have often been used for paleoecological reconstruction, but recent studies have shown that, even when solubility profiling techniques are employed in an attempt to recover biogenic signals, bone is an unreliable material. As a result, there has been renewed interest in using enamel for such studies, as it is known to be less sus...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و علوم انسانی دکتر علی شریعتی 1392

هدف این مطالعه تعیین کردن این مساله است که آیا فراگیران فارسی زبان قادر به تطبیق پارامتری ضمیر موصولی that در جملات ساده و پیچیده ی انگلیسی در سایه اصل دستور جهانی هستند یا خیر. به علاوه نقش جنسیت در رابطه با آزمون تشخیص درستی یا نادرستی جملات دستوری مورد بررسی قرار گرفت. داده ها از 54 دانشجوی فراگیر زبان انگلیسی در دانشگاه فردوسی مشهد گردآوری شد. شرکت کنندگان در آزمون شامل 28 زن (51.85 درصد)و ...

Journal: :Science 1976
W C Wang Y L Yung A A Lacis T Mo J E Hansen

Nitrous oxide, methane, ammonia, and a number of other trace constituents in the earth's atmosphere have infrared absorption bands in the spectral region 7 to 14 microm and contribute to the atmospheric greenhouse effect. The concentrations of these trace gases may undergo substantial changes because of man's activities. Extensive use of chemical fertilizers and combustion of fossil fuels may p...

2016
Jesus Lozano-Fernandez Robert Carton Alastair R Tanner Mark N Puttick Mark Blaxter Jakob Vinther Jørgen Olesen Gonzalo Giribet Gregory D Edgecombe Davide Pisani

Understanding animal terrestrialization, the process through which animals colonized the land, is crucial to clarify extant biodiversity and biological adaptation. Arthropoda (insects, spiders, centipedes and their allies) represent the largest majority of terrestrial biodiversity. Here we implemented a molecular palaeobiological approach, merging molecular and fossil evidence, to elucidate the...

2008
KRISTIAN FAUCHALD WILHELM STüRMER Kristian Fauchald Wilhelm Stürmer Ellis L. Yochelson

One radiograph of Hunsrück slate shows the presence of a drop-shaped "worm". This image resembles an acoel platyhelminth in the presence of an apparently eversible pharyngeal structure, but no trace can be tound of the complex reproductive structures of platyhelminths, making full identification impossible. Another more elongate worm-like image shows the presence of anterior perforations into a...

2015
Małgorzata Bieńkowska-Wasiluk Alfred Uchman Agata Jurkowska Ewa Świerczewska-Gładysz

The trace fossil Lepidenteron lewesiensis (Mantell 1822) provides an exceptional taphonomic window to diversity of fishes as shown for the Upper Cretaceous of Poland, in the Middle Turonian-Lower Maastrichtian deposits of the Opole Trough, Miechów Trough, Mazury-Podlasie Homocline, and SE part of the Border Synclinorium. Lepidenteron lewesiensis is an unbranched burrow lined with small fish sca...

2016
Steen Wilhelm Knudsen Peter Rask Møller Werner Schwarzhans Jørgen G. Nielsen

This article comprise the data related to the research article (Møller et al., 2016) [1], and makes it possible to explore and reproduce the topologies that allowed [1] to infer the relationship between the families Bythitidae and Dinematichthyidae. The supplementary data holds nexus-input files for the Bayesian analysis and the '.xml'-input files - with and without nucleotide data - that are u...

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