EXAMINING THE DEVELOPMENT OF LANDSCAPE AT THE MSUM REGIONAL SCIENCE CENTER (NORTHWESTERN MINNESOTA) THROUGH SEDIMENT ANALYSIS AND CORRELATION OF LOCAL BURIED SOIL HORIZONS

2018 ◽  
Author(s):  
David Ahumada ◽  
◽  
Emily Hartwig ◽  
Yoko Kosugi ◽  
Domonic Mugavero ◽  
...  
Keyword(s):  
Regional Science ◽  
Science Center ◽  
Soil Horizons ◽  
Sediment Analysis ◽  
Buried Soil

scholarly journals Landscape Dynamics in the Caspian Lowlands Since the Last Deglaciation Reconstructed From the Pedosedimentary Sequence of Srednaya Akhtuba, Southern Russia

Geosciences ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 492 ◽  
Author(s):  
Marina Lebedeva ◽  
Alexander Makeev ◽  
Alexey Rusakov ◽  
Tatiana Romanis ◽  
Tamara Yanina ◽  
...  
Keyword(s):  
Clay Mineralogy ◽  
Fine Sand ◽  
Middle Part ◽  
Source Material ◽  
Last Deglaciation ◽  
Soil Horizons ◽  
Aeolian Transport ◽  
Southern Russia ◽  
Buried Soil ◽  
The Last Deglaciation

Surface Kastanozem of the Lower Volga area was first studied as a part of the pedocomplex, with the lower part (148–160 cm) formed in Early Khvalynian Chocolate clays (13–15 ka), the middle part (100–148 cm) in a mixed clay-loess sediment sand, and the upper part (0–100 cm) in loess. This resulted from local aeolian transport, with the source material derived from the rewinding of marine sediments. They are enriched in aggregates of Chocolate clays and glauconitic grains of a fine sand-course silt size and have similar contents of clay minerals. The high salinity of similar types evidences marine genesis for both Chocolate clays and source material for loess sediments. Clay fragments of a sand and silt size are responsible for the heavy texture and high gypsum content of loess. The study of soils with the focus on micromorphology and clay mineralogy allows the identification of the complex character of a shift from marine to sub-areal sedimentation. This shift was accompanied by short breaks in sedimentation, allowing the development of synlithogenic soil horizons of Late Khvalynian, after-Khvanynian, and Boreal time. The features of shallowly buried soil horizons confirm increased aridity after the last deglaciation. Surface Calcic Kastanozem is a full Holocene soil reflecting the present environment. However, it is deeply influenced by shallow buried soil horizons and Chocolate clays.

Extractable Fe and Al as an indicator for buried soil horizons

CATENA ◽  
1983 ◽  
Vol 10 (1-2) ◽  
pp. 167-173 ◽  
Author(s):  
J.F. Dormaar ◽  
L.E. Lutwick
Keyword(s):  
Soil Horizons ◽  
Buried Soil

Early Neolithic Pits and Artefact Scatters at North Fen, Sutton Gault, Cambridgeshire

2016 ◽  
Vol 82 ◽  
pp. 161-191 ◽  
Author(s):  
Jonathan Tabor ◽  
Lawrence Billington ◽  
Frances Healy ◽  
Mark Knight
Keyword(s):  
Spatial Separation ◽  
Landscape Scale ◽  
Early Neolithic ◽  
Soil Horizons ◽  
Archaeological Investigation ◽  
Excellent Opportunity ◽  
The Past ◽  
Individual Site ◽  
Buried Soil

This paper presents the results of an excavation at North Fen, Sutton Gault, Cambridgeshire, which revealed evidence of Early Neolithic occupation comprising some 48 pits together with twoin situartefact scatters preserved within buried soil horizons. Largely as a result of the spatial separation between scatters and pit sites/clusters, it has been possible to identify a series of ‘sites’, which appear to represent temporally discrete episodes of activity ranging from task-specific ‘visits’ to relatively long-lived occupation. Through analysis of pottery and flint assemblages an attempt is made to characterise each individual site in terms of the types of activities undertaken there and to consider their scale and duration. Set within a landscape that has seen extensive archaeological investigation over the past 30 years the excavation also provides an excellent opportunity to explore how these sites relate to activity in the wider locale and to what extent it is possible to characterise Early Neolithic occupation at a landscape scale.

scholarly journals Age of Rotational Landslides in the Cypress Hills, Alberta-Saskatchewan

2007 ◽  
Vol 40 (3) ◽  
pp. 239-248 ◽  
Author(s):  
Mark R. Goulden ◽  
David J. Sauchyn
Keyword(s):  
Late Holocene ◽  
Microscopic Analysis ◽  
Carbon Cluster ◽  
Organic Content ◽  
Soil Horizons ◽  
The West ◽  
Relative Age ◽  
Buried Soil ◽  
Geomorphic Processes ◽  
Landslide Debris

ABSTRACTThe topography of the west block of the Cypress Hills indicates that fluvial dissection of the plateaux and subsequent rotational landsliding of valley sides have been the dominant Quaternary geomorphic processes. This paper presents a preliminary chronology of rotational landslides based on the relative ages of 17 landslides and on 3 absolute dates. Four indices of relative age were used: organic content in Ah and B soil horizons, the size and coverage of lichens and weathering rind thickness on boulders exposed by landsliding, and the concavity and gradient of gullies in landslide debris, One landslide occurred in 1965. Organic materials collected from buried soil horizons beneath depressions on 3 other landslides were radiocarbon dated at 1235 ± 105, 1635 ± 105 and 7259 ± 165 yrs. BP. Microscopic analysis of the organic material revealed that the oldest sample was contaminated with older carbon. Cluster analysis of the relative age data in conjunction with 3 acceptable absolute dates suggests that the landslides under study have occurred during late Holocene time.

Use of EDS mapping to characterize thermochemical stability of fibers in intermetallic matrix composites

1992 ◽  
Vol 50 (1) ◽  
pp. 160-161
Author(s):  
John R. Porter
Keyword(s):  
Spatial Information ◽  
Beam Current ◽  
Fiber Types ◽  
Ceramic Fibers ◽  
Dye Transfer ◽  
Science Center ◽  
Commercial Development ◽  
Nih Image ◽  
Intermetallic Matrix Composites ◽  
Thermochemical Stability

New ceramic fibers, currently in various stages of commercial development, have been consolidated in intermetallic matrices such as γ-TiAl and FeAl. Fiber types include SiC, TiB2 and polycrystalline and single crystal Al2O3. This work required the development of techniques to characterize the thermochemical stability of these fibers in different matrices.SEM/EDS elemental mapping was used for this work. To obtain qualitative compositional/spatial information, the best realistically achievable counting statistics were required. We established that 128 × 128 maps, acquired with a 20 KeV accelerating voltage, 3 sec. live time per pixel (total mapping time, 18 h) and with beam current adjusted to give 30% dead time, provided adequate image quality at a magnification of 800X. The maps were acquired, with backgrounds subtracted, using a Noran TN 5500 EDS system. The images and maps were transferred to a Macintosh and converted into TIFF files using either TIFF Maker, or TNtolMAGE, a Microsoft QuickBASIC program developed at the Science Center. From TIFF files, images and maps were opened in either NIH Image or Adobe Photoshop for processing and analysis and printed from Microsoft Powerpoint on a Kodak XL7700 dye transfer image printer.

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