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Full-Text Articles in Physical Sciences and Mathematics
Sequence Stratigraphy Of The Andrill And-2a Drillcore, Antarctica: A Long-Term, Ice-Proximal Record Of Early To Mid-Miocene Climate, Sea-Level And Glacial Dynamism, Christopher R. Fielding, Greg H. Browne, Brad Field, F. Florindo, D. M. Harwood, L. A. Krissek, Richard Levy, K. Panter, Sandra Passchier, Stephen F. Pekar
Sequence Stratigraphy Of The Andrill And-2a Drillcore, Antarctica: A Long-Term, Ice-Proximal Record Of Early To Mid-Miocene Climate, Sea-Level And Glacial Dynamism, Christopher R. Fielding, Greg H. Browne, Brad Field, F. Florindo, D. M. Harwood, L. A. Krissek, Richard Levy, K. Panter, Sandra Passchier, Stephen F. Pekar
Sandra Passchier
Present understanding of Antarctic climate change during the Early to Mid-Miocene, including major cycles of glacial expansion and contraction, relies in large part on stable isotope proxies from deep sea core drilling. Here, we summarize the lithostratigraphy of the ANDRILL Southern McMurdo Sound Project drillcore AND-2A. This core offers a hitherto unavailable ice-proximal stratigraphic archive from a high-accommodation continental margin setting, and provides clear evidence of repeated fluctuations in climate, ice expansion/contraction and attendant sea-level change over the period c. 20.2–14.2 Ma, with a more fragmentary record of Late Miocene and Pliocene time. The core is divided into seventy-four high-frequency …
Sedimentology And Stratigraphy Of The And-2a Core, Andrill Southern Mcmurdo Sound Project, Antarctica, Christopher R. Fielding, C. B. Atkins, K. N. Bassett, G. H. Browne, G. B. Dunbar, B. D. Field, Tracy D. Frank, L. A. Krissek, K. S. Panter, S. Passchier, S. F. Pekar, S. Sandroni, F. Talarico
Sedimentology And Stratigraphy Of The And-2a Core, Andrill Southern Mcmurdo Sound Project, Antarctica, Christopher R. Fielding, C. B. Atkins, K. N. Bassett, G. H. Browne, G. B. Dunbar, B. D. Field, Tracy D. Frank, L. A. Krissek, K. S. Panter, S. Passchier, S. F. Pekar, S. Sandroni, F. Talarico
Sandra Passchier
During the 2007 – 2008 austral spring season, the ANDRILL Southern McMurdo Sound Project recovered a core 1138 metres long (AND-2A) from a location in the southern McMurdo Sound near the Dailey Islands. This core contains a range of lithologies, including various types of terrigenous clastic diamictite, conglomerate and breccia, sandstone and mudrocks, volcanic lava, pyroclastic and reworked volcanic sedimentary rocks, and diatomite. The succession is divided into fourteen lithostratigraphic units (LSUs), two of which (LSUs 1 and 8) are further subdivided into three and four sub-units, respectively, based on changes in abundance of lithologies. Thirteen lithofacies are recognized, ranging …
The Role Of Environmental Filtering In Structuring Appalachian Tree Communities: Topographic Influences On Functional Diversity Are Mediated Through Soil Characteristics, Julia I. Chapman, Ryan W. Mcewan
The Role Of Environmental Filtering In Structuring Appalachian Tree Communities: Topographic Influences On Functional Diversity Are Mediated Through Soil Characteristics, Julia I. Chapman, Ryan W. Mcewan
Ryan McEwan
Identifying the drivers of community assembly has long been a central goal in ecology, and the development of functional diversity indices has provided a new way of detecting the influence of environmental gradients on biotic communities. For an old-growth Appalachian forest, we used path analysis to understand how patterns of tree functional diversity relate to topography and soil gradients and to determine whether topographic effects are mediated through soil chemistry. All of our path models supported the idea of environmental filtering: stressful areas (high elevation, low soil moisture, low soil nutrients) were occupied by communities of low functional diversity, which …