A 10Be chronology of south‐western Scandinavian Ice Sheet history during the Lateglacial period          下载免费PDF全文

JASON P. BRINER  JOHN INGE SVENDSEN  JAN MANGERUD  ØYSTEIN S. LOHNE  NICOLÁS E. YOUNG 《第四纪科学杂志》2014,29(4):370-380

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PERCEPTIONS OF A FUTURE FOR MEALNESIA. By R. D. Bedford     

ELSPETH A. YOUNG 《New Zealand geographer》1983,39(2):93-93

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Poverty, hunger and population policy: linking Cairo with Johannesburg   总被引：1，自引：0，他引：1  

ANTHONY YOUNG 《The Geographical journal》2005,171(1):83-95

Attitudes to population policy taken by major international institutions display a lack of symmetry. Population-based institutions forcefully set out the effects of population on development and human welfare. In contrast, institutions and lobbies concerned with hunger, poverty and environment, brought together at the 2003 World Summit on Sustainable Development in Johannesburg, treat population growth as a given, independent, variable. This paper gives a land resources viewpoint. It includes a case study of Malawi and cross-country statistical comparisons. Official estimates of the extent of spare land, cultivable but not presently cultivated, are challenged. It is concluded that in low-income, food-deficit countries population increase has reduced, in some areas nullified, advances in agricultural development. Following the 1994 UN Conference on Population and Development in Cairo, a set of ethically acceptable measures for reducing population growth received general acceptance. All concerned with poverty, hunger and environment should follow the policy road from Cairo to Johannesburg. If greater efforts are not made to reduce rates of population increase, the targets of the Millennium declaration will not be met, and the suffering which these cause will continue. Statements about agriculture, food security, poverty and sustainability should recognize that population is not an external variable but an integral part of development.  相似文献   

The Hunghae Formation, SE Korea: Miocene debris aprons in a back-arc intraslope basin   总被引：1，自引：0，他引：1  

MOON YOUNG CHOE  SUNG KWUN CHOUGH 《Sedimentology》1988,35(2):239-255

ABSTRACT During early to middle Miocene times a sudden opening of the Ulleung (Tsushima) back-arc basin in the East Sea (Sea of Japan) led to the development of intraslope basins along the rifted southwestern margin (southeast Korea). Abrupt subsidence resulted in the deposition of the 200 m thick Hunghae Formation (middle Miocene), a sand/mudstone sequence that can be divided into five facies. Facies I (sand and mudstone couplet) and II (coarse sand) are turbiditic in origin, as evidenced by massive, graded, crudely-layered and parallel-laminated sand beds. Facies III (homogeneous mudstone) is characterized by various lignite and plant fragments, clastic and biogenic grains that are randomly oriented, suggestive of hemipelagic deposition. Facies IV (chaotic deposit) is characterized by the disruption of beds, the presence of isolated siltstone blocks (or balls) and large clasts in the muddy matrix, indicative of retrogressive rockfall and slide/slump. Facies V (conglomerate) is of debris flow origin, as evidenced by clast- and matrix-supported features, floating large clasts and absence of traction structures. Individual facies are organized into two types of facies association: (1) homogeneous mudstone (facies III) associated randomly with the rest (facies I, II, IV and V), indicative of hemipelagic and episodic sediment-gravity flow processes, respectively; (2) conglomerate (facies V), coarse sand (facies II) and sand/mudstone couplet (facies I), representing the flow transformation from debris flow to high- and low-concentration turbidity currents. These facies associations are similar in many respects to modern and ancient debris (or slope) aprons found elsewhere. Numerous isolated slide/slump blocks, wedged conglomerates with armoured mudstone balls, discontinuous lignite-containing sand/mudstone beds, chaotic structure and growth faults suggest that the deposition occurred on a steep slope (intraslope basin) off coalescing fan-deltas, mainly by unchannellized sediment-gravity flows. Ancient deposits with irregular facies sequences can be viewed as debris-apron systems, which provide alternatives to submarine-fan models in many clastic basins with a line rather than point source.  相似文献   

DIE STRATIGRAPHISCHE UND PALAEONTOLOGISCHE BEDEUTUNG DER FOSSILEN NAGETIERE CHINAS     

VON C.C.YOUNG 《地质学报》1931,(1)

Ⅰ. VORBEMERKUNG. Die Ordnung Nagetiere umfasst sehr viele Arten und ist die verbreitetste Tiergruppe innerhalb der Saeugetiere. Sie macht mit ihren etwa 2800 Species mehr als ein Drittel der heutigen Landsaeugetiere aus. Die Nagetiere sind auf der ganzen Welt bis zu den Polen und dem vereisten Hochgebirge an-  相似文献   

On tho Triassic Dicynodonts from Shansi     

C.C.YOUNG 《地质学报》1937,(Z1)

The occurrence of Dicynodonts in the Triassic beds and short accountson the geological conditions in south-eastern Shansi has already beenreported on an earlier paper.~1 The present note deals with the descrip-tion of the specimens.By the size and peculiar structure of a few bones  相似文献   

Note on Some Fossil Footprints in China     

C.C.YOUNG 《地质学报》1943,(Z2):153-157

正 In the past few years, a number of fossil footprint have been noticed by members of the National Geological Survey of China. At least in three localities  相似文献   

Fossil Crocodiles in China,with Notes on Dinosaurian Remains associated with the Kansu Crocodiles     

CHUNG-CHIEN YOUNG 《地质学报》1948,(Z2):272-312

正 During the field season of 1947,the Prospecting Division of the Kansu-Chinghai Branch Office of the Chinese Petroleum Corporation,NationalResources Commission of China under Mr.C.C.Sun made detailed studyof the petroleum geology of the Shiangtang'-Haishihwan~2 region,Mr.H.C.Miao,the geologist of t  相似文献   

LOCAL PEOPLE AND CONSERVATION IN MEXICO's EL VIZCAÍNO BIOSPHERE RESERVE*     

EMILY YOUNG 《Geographical review》1999,89(3):364-390

ABSTRACT. It is increasingly clear that local participation in conservation endeavors is not only critical but also highly problematic. El VizcaÍno Biosphere Reserve in Baja California Sur, Mexico, is examined to study the difficulties involved in translating community-based conservation rhetoric into on-the-ground nature-protection efforts. This case illustrates how inhabitants of a reserve are marginalized by the very conservation process meant to engage them as key actors in promoting natural-resource protection. It also highlights recent attempts to enhance local participation in reserve endeavors through collaborative efforts among field staff, nongovernmental organizations, and area residents.  相似文献   

Petrogenesis of sediments in the absence of chemical weathering: effects of abrasion and sorting on bulk composition and mineralogy   总被引：15，自引：0，他引：15  

H. WAYNE NESBITT  GRANT M. YOUNG 《Sedimentology》1996,43(2):341-358

Comminution in the glaciers that debouch into Guys Bight Basin, followed by selective sorting in the fluvial system, has had little effect on the bulk composition, or on the mineralogy, of the basin sands and muds. Most striking are the feldspar contents, and the feldspar-quartz ratios in sands and muds, both of which remain similar to those of average bedrock. The feldspar contents of sands and muds range from 48 to 52% feldspar whereas average bedrock contains 51·7% feldspar. Feldspar-quartz ratios average 1·58:1 in bedrock and 1·54:1, 1·66:1 and 1·69:1 in the medium to coarse sands, fine sands and muds, respectively, indicating minimal feldspar enrichment in the fine-grained sediments. In the absence of appreciable chemical weathering, extreme abrasion followed by hydraulic sorting has not produced mature sediments such as quartz arenites and clay-mineral-rich muds. There is, however, some chemical differentiation. Preferential accumulation of mafic minerals in fine sands and muds is reflected in bulk compositions by higher abundances of MgO, FeO and TiO₂, and in the mineralogy by enrichment of biotite in the fine grades. Bulk compositional studies focused solely on muds and mudstones will result in an overestimate of the mafic contribution from source rocks. This work shows that bulk compositional studies of sediments and sedimentary rocks should include all available granulometric grades.  相似文献