نتایج جستجو برای: lated devonian

تعداد نتایج: 2985  

Journal: :Anais da Academia Brasileira de Ciencias 2008
Juliana Salvi André Jasper Fresia Ricardi-Branco Mary Elizabeth C Bernardes-de-Oliveira Margot Guerra-Sommer

The genus Lycopodites, which encompasses the herbaceous forms of the lycopsids, presents broad time and spacial distribution during the Paleozoic in the Northern Hemisphere, with its initial records dating from the European Devonian. As to Gondwanan Paleozoic, to this moment, only Lycopodites amazonica Dolianiti had been reported for the Amazonian Middle Devonian (Curuá Group). Thus, the specim...

Journal: :Proceedings of the Japan Academy 1975

Journal: :Geological Magazine 1879

Journal: :American Journal of Science 1863

Journal: :Media Pendidikan Matematika 2022

Producing processes of besek are indicated to be strongly related several concepts mathematics. This research has a purpose obtain detailed information about it. The da-ta was obtained by doing interview with three respondents who have vast experience in making besek. Results the shows there mathematics re-lated producing besek, namely estimation, patterns, and geometry. Esti-mation consists me...

Journal: :iranian journal of science and technology (sciences) 2007
n. abbassi

upper devonian sediments of the kuh-e zard area northwest of zefreh, central iran, arecomposed mainly of brown and grey limestones with sandstone and shale intercalations. they contain tracefossils such as chondrites isp., diplocraterion parallelum, fustiglyphus annulatus, lockeia isp., phycodesisp., and taenidium barretti. these trace fossils indicate a shallow marine environment

Journal: :Geosphere 2023

The Yukon-Tanana terrane in Yukon, Canada, records Late Devonian (ca. 366–360 Ma) rifting and the onset of latest Devonian–Carboniferous arc back-arc magmatism 360–325 Northern Cordillera. Detrital zircon U-Pb Hf isotope analyses indicate that metasedimentary basement was sourced northwestern Laurentia. Sandstones successions generally have robust Devonian–Mississippian age peaks, their signatu...

2004
William R. Dickinson

■ Abstract The Cordilleran orogen of western North America is a segment of the Circum-Pacific orogenic belt where subduction of oceanic lithosphere has been underway along a great circle of the globe since breakup of the supercontinent Pangea began in Triassic time. Early stages of Cordilleran evolution involved Neoproterozoic rifting of the supercontinent Rodinia to trigger miogeoclinal sedime...

2013
ANDREW B. SMITH SAMUEL ZAMORA

Based on new material from Germany and Spain, the echinoid “Lepidocentrus” ibericus from the Early Devonian (Emsian) of northern Spain is shown to be congeneric with Rhenechinus from the Hunsrück Slate of south−western Germany. New in− formation on the lantern, pedicellariae and internal structure of the theca is provided, and confirms this genus as a member of the Echinocystitidae–Proterocidar...

1999
Filippo Ferri

The Late Devonian to Early Mississippian is an important metallogenic epoch within the Canadian cordillera resulting in the production of significant sediment exhalative massive sulphide (SEDEX) and volcanogenic massive sulphide (VMS) mineral occurrences within rocks of cratonic or pericratonic affinity. Major belts include the Late Devonian Earn-hosted SEDEX deposits of the Selwyn and Gataga d...

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