نتایج جستجو برای: paleogeography

تعداد نتایج: 373  

2009
Thomas Servais

The Great Ordovician Biodiversification Event” (GOBE) was arguably the most important and sustained increase of marine biodiversity in Earth’s history. During a short time span of 25 Ma, an “explosion” of diversity at the order, family, genus, and species level occurred. The combined effects of several geological and biological processes helped generate the GOBE. The peak of the GOBE correlates...

2007
J-C. VICENTE

Following examination of the evolution of the Jurassic Andean retroarc basin at a global scale for the Central Andes, this paper analyses the pattern of the regressive process, and discusses some general features concerning Andean Jurassic Paleogeography. The early Upper Jurassic regression obeys to an exactly reverse pattern as the one evidenced for the Lower Jurassic transgressive process. Se...

2016
María Julia Arrouy Lucas V. Warren Fernanda Quaglio Daniel G. Poiré Marcello Guimarães Simões Milena Boselli Rosa Lucía E. Gómez Peral

The origin, affinity and paleoecology of macrofossils of soft-bodied organisms of the terminal Ediacaran Period have been highly debated. Previous discoveries in South America are restricted to small shelly metazoans of the Nama Assemblage. Here we report for the first time the occurrence of discoidal structures from the Upper Ediacaran Cerro Negro Formation, La Providencia Group, Argentina. Sp...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم 1390

به منظور بررسی گسترش چینه شناسی استراکدها در عضو eسازند قم ، یک برش چینه شناسی مناسب از یال شمال غربی تاقدیس کمرکوه برگزیده شد. این برش چینه شناسی در غرب شهر قم و در ناحیه الگو قرار دارد. برش مورد بررسی عمدتا از مارن و تتلوب میان لایه ای از سنگ آهک ، ماسه سنگ و سنگ آهک ماسه دار تشکیل شده است. 68 نمونه از مارنهای عضو e این سازند با ضخامت 7/112 متر برداشته شدو 2720 کاراپاس و 10 کفه در 56 نمونه مو...

Journal: :IOP conference series 2021

In contrast to paleogeography and evolutionary geography, landscape science is only a few decades old. This paper traces the history of paleogeographic research and, on this basis, development methodology methods science. country, began with reconstruction vegetation cover based edaphic approach. Later, such work started be integration palynological data reconstructions climatic changes. Actual...

Journal: :Proceedings of the Karelian Research Centre of the Russian Academy of Sciences 2017

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