نتایج جستجو برای: outcrop
تعداد نتایج: 1295 فیلتر نتایج به سال:
Previous studies of spatial patterns among fossil assemblages have demonstrated the utility of gradient analysis as a n investigative tool inpaleobiology. However, because lateral samples in these studies have routinely been widely spaced (commonly tens of kilometers apart), there is little sense of the degree to which faunas vary locally, relative to variation observed a t larger scales along ...
Within the unglaciated eastern United States, where the natural vegetation is mostly deciduous forest, edaphically-controlled herbaceous plant communities occur on unshaded rock outcrops in shallow soil developed from serpentine, shale, granite, limestone, dolomite, sandstone, chert, rhyolite and other rock types. The most distinctive features of the flora of these communities are their endemic...
Vascular plants of high-elevation cliffs and rock outcrops were sampled on 42 peaks in the Southern Appalachians. Species found were predominantly native, summer-flowering, herbaceous perennials. Species endemic to the Southern and Central Appalachians comprise over 25% of the total flora; species restricted to eastern North America include nearly 50% of the flora. The diversity of biogeographi...
Introduction: The second MER rover (Opportunity) landed on Meridiani Planum on January 24, 2004 inside a shallow crater. The science rational for the selection of the landing site centered on detection of the mineral hematite from martian orbit by the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES) [1,2]. Other smaller occurrences of hematite are in Aram Chaos and several isolated ...
The incipient island-arc system of southern Central America (Cretaceous early Oligoccne) is characterized by thick turbidite systems. which mainly filled inner fore-arc troughs. Outcrop data show four. second-order depositional sequences in the deep-water sedlments. The formation of these depositional sequences is strongly related to the morphotectonic evolution of the island-arc system. Each d...
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