Results 101 to 110 of about 10,140 (227)

A four stage evolution of the White Channel gravel: Implications for stratigraphy and palaeoclimates [PDF]

open access: yes, 2014
Although the White Channel gravel (WCG) of the Klondike district, Yukon, contains gold placers which have been exploited for over a century, few sedimentological studies have been undertaken.
Chapman, Robert   +3 more
core  

Palaeoenvironments at Sehonghong, Lesotho

open access: yes, 2017
This thesis presents palaeoenvironmental analyses of material from Sehonghong rockshelter, a Middle and Later Stone Age site in the highlands of Lesotho. Stable carbon isotope analyses of late Pleistocene and Holocene sediments and faunal enamel allow for an assessment of altitudinal shifts of C3 and C4 grasslands with changing temperature.
Loftus, E, Loftus, Emma
openaire   +1 more source

Morphological trends in the molars of fossil rodents from the Fayum Depression, Egypt [PDF]

open access: yes, 2007
While many of the mammalian taxa from the Fayum of Egypt, such as the primates and hyraxes, have been well-studied, little is known about the rodents. Species described to date have all been referred to the endemic family Phiomyidae. Many rodent species
Lewis, Patrick J., Simons, Elwyn L.
core  

Nueva información palinológica sobre la Formación Poti (Viseano superior) en el arroyo Roncador, Cuenca Parnaíba, noreste de Brasil [PDF]

open access: yes, 2014
Se presenta el resultado del análisis palinológico de seis muestras de superficie de la Formación Poti expuesta en el arroyo Roncador (Jerumenha, Piauí), noreste de Brasil.
Di Pasquo Lartigue, Maria, Iannuzzi, R.
core   +1 more source

Foraminíferos bentónicos y paleoambientes del Jurásico Inferior y Medio de la zona occidental de la Cuenca Vasco-Cantábrica (norte de España) [PDF]

open access: yes
Se estudian los foraminíferos bentónicos de edad Jurásico Inferior y Medio de la zona occidental de la Cuenca Vasco Cantábrica (secciones de Tudanca, Aguilar de Campoó y Barrios de Villadiegos).
Gräfe, K.-U.
core   +1 more source

Les ensembles céramiques du Bassin de Murzuq: une contribution de l'archéologie préventive à la connaissance du Messak

open access: yes, 2008
International audienceThe analysis of the ceramic remains found during pre-ventive archaeological operations carried out from 1999 to 2005 in the Murzuq basin allows an archaeological foundation to be given to the history of the human occu-pation of the ...
Gallin, Annabelle   +1 more
core   +2 more sources

Ostracods from freshwater and brackish environments of the Carboniferous of the Midland Valley of Scotland : the early colonization of terrestrial water bodies [PDF]

open access: yes, 2012
The Mississippian Strathclyde Group of the Midland Valley of Scotland yields some of the earliest non-marine ostracods. The succession records shallow marine, deltaic, estuarine, lagoonal, lacustrine, fluvial and swamp environments representing a series ...
Bennett, C.E.   +6 more
core  

The distribution and palaeoenvironment meaning of carbon, sulfur, and biogenic silica in the sediments of the western arctic ocean [PDF]

open access: yes, 2013
北极环境变化与系统内生物地球化学过程有密切联系,生源要素的变化趋势在一定程度上记录了环境的变化。这种驱动与响应之间的信息被保留到沉积物中,以各种地球化学参数的沉积记录表现出来。 本研究是利用中国首次、第二次北极科学考察所采集的西北冰洋楚科奇海及邻近海域39个表层沉积物样品、12个短岩芯和2个长岩芯沉积物样品为分析对象,测定了其中的总碳、总硫、有机碳、无机碳和生源硅等生源要素,通过参考前人研究成果,如沉积物颜色、粒径等特征,并结合西北冰洋海域的物质来源、环境状况及其演变趋势的分析 ...
彭建平
core  

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