Pyrogenic Evidence in Paleosols along the North Saskatchewan River in the Rocky Mountains of Alberta

1975 ◽  
Vol 12 (7) ◽  
pp. 1238-1244 ◽  
Author(s):  
J. F. Dormaar ◽  
L. E. Lutwick
Keyword(s):  
Magnetic Susceptibility ◽  
Rocky Mountains ◽  
Water Droplet ◽  
River Valley ◽  
Mineral Matter ◽  
Fe Oxides ◽  
The North ◽  
Organic Debris ◽  
Vertical Sections ◽  
Droplet Penetration

Vertical sections of paleosols along the Upper North Saskatchewan River valley show horizons that have distinct brown to reddish-brown colors. Based on such criteria as time for water droplet penetration, magnetic susceptibility, and crystallization of Fe oxides, together with present conditions and vegetation of the fans and floodplain in that area, it was concluded that these brown horizons were fire-affected. The organic debris in the bogs before a fire is continually being enriched with silt blowing from the floodplain. The colored horizons are considered to be a combination of accessed eolian matter reddened in the layer of burning debris and some mineral matter reddened by conducted heat.

Analysis of water droplet penetration in earth plasters using X-ray microtomography

2021 ◽  
Vol 283 ◽  
pp. 122651
Author(s):  
T. Mauffré ◽  
E. Keita ◽  
E. Contraires ◽  
F. McGregor ◽  
A. Fabbri
Keyword(s):  
Water Droplet ◽  
X Ray ◽  
Droplet Penetration

Holocene climate recorded by magnetic properties of lake sediments in the Northern Rocky Mountains, USA

The Holocene ◽  
2019 ◽  
Vol 30 (3) ◽  
pp. 479-484
Author(s):  
Daniel P Maxbauer ◽  
Mark D Shapley ◽  
Christoph E Geiss ◽  
Emi Ito
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Rocky Mountains ◽  
Future Research ◽  
Magnetic Minerals ◽  
Holocene Climate ◽  
Northern Rocky Mountains ◽  
The North ◽  
Lake Bottom ◽  
Northern Rockies

We present two hypotheses regarding the evolution of Holocene climate in the Northern Rocky Mountains that stem from a previously unpublished environmental magnetic record from Jones Lake, Montana. First, we link two distinct intervals of fining magnetic grain size (documented by an increasing ratio of anhysteretic to isothermal remanent magnetization) to the authigenic production of magnetic minerals in Jones Lake bottom waters. We propose that authigenesis in Jones Lake is limited by rates of groundwater recharge and ultimately regional hydroclimate. Second, at ~8.3 ka, magnetic grain size increases sharply, accompanied by a drop in concentration of magnetic minerals, suggesting a rapid termination of magnetic mineral authigenesis that is coeval with widespread effects of the 8.2 ka event in the North Atlantic. This association suggests a hydroclimatic response to the 8.2 ka event in the Northern Rockies that to our knowledge is not well documented. These preliminary hypotheses present compelling new ideas that we hope will both highlight the sensitivity of magnetic properties to record climate variability and attract more work by future research into aridity, hydrochemical response, and climate dynamics in the Northern Rockies.

The late Wisconsinan olistostrome of the lower Coppermine River valley, Northwest Territories

1986 ◽  
Vol 23 (11) ◽  
pp. 1700-1708 ◽  
Author(s):  
Denis A. St-Onge ◽  
Jean Lajoie
Keyword(s):  
Debris Flows ◽  
Late Quaternary ◽  
Fine Sand ◽  
Coarse Sand ◽  
Coarse Fraction ◽  
River Valley ◽  
Glacial Lake ◽  
The North ◽  
Geologic Record ◽  
Coppermine River

The late Quaternary olistostrome exposed in the lower Coppermine River valley fills a paleovalley that ranges in apparent width from 150 to 400 m and was cut into Precambrian bedrock before the last glaciation. The olistostrome is here named the Sleigh Creek Formation. The coarse fraction of the formation is matrix supported; beds are massive or reversely graded and have sharp, nonerosive contacts. These characteristics suggest deposition of the coarse fraction by debris flows. The olistostrome sequence is bracketed by, and wedged into, a marine rhythmite sequence, which indicates that deposition occurred in a marine environment.About 10 500 years BP glacier ice in the Coronation Gulf lowland dammed the valley to the south, which was occupied by glacial Lake Coppermine. Sediments accumulated in this lake in a 30 m thick, coarsening upward sequence ranging from glaciolacustrine rhythmites of silt and fine sand at the base to coarse sand alluvium, and deltaic gravels at the top. As the Coronation Gulf lowlands became ice free, the Coppermine River reoccupied its former drainage course to the north. The steep south to north gradient and rapid downcutting by the river through the glacial lake sediments produced unstable slope conditions. The resulting debris flows filled a bedrock valley network below the postglacial sea level, forming the diamicton sequence.The interpretation of the Sleigh Creek Formation raises questions concerning silimar diamicton deposits usually defined as "flowtills." More generally, the results of this study indicate that care must be used when attempting paleogeographic reconstructions of "glaciogenic" deposits in marine sequences in any part of the geologic record.

scholarly journals Ecological-taxonomic analysis of the petrophyte flora of Ikhrek (Rutulsky district) surroundings of Republic of Dagestan

2016 ◽  
Vol 5 (4) ◽  
pp. 70-73
Author(s):  
Agarza Medzhidovich Khalidov
Keyword(s):  
Rocky Mountains ◽  
Genetic Relationships ◽  
Taxonomic Composition ◽  
Environmental Groups ◽  
North West ◽  
Taxonomic Analysis ◽  
The North ◽  
History Of ◽  
The Republic ◽  
Mountain Country

The study of petrophytes, as a peculiar group of plants, is important for understanding the history of the flora and nature in general. Their ecological characteristics, taxonomic composition, geographic and genetic relationships and other characteristics carry information about the stages of development of the mountain country and its flora. Rutulsky district is a part of Highland Dagestan and borders on the Republic of Azerbaijan in the South, Akhtynsky and Kurakhsky districts in the East, Tlyaratinsky and Charodinsky districts in the North-West, Kulinsky, Agulsky and Laksky districts of the Republic of Dagestan in the North. The relief of Highland Dagestan, which is the area of our research, is characterized by a large slope, stony and rocky mountains. The following paper contains taxonomic, biomorphic, ecological analyses of petrophyte complexes of the studied area and an analysis of endemism and relict flora of petrophytic complexes. Herbarium material has helped to find the dominant family, genera and species of petrophyte complexes of the area. Biomorphic and environmental groups of petrophyte complexes have been studied. Confinement of petrophytes to different environmental conditions has been established. Endemic, relict and protected species of petrophyte complexes have been identified.

scholarly journals Pałac czy dwór? Na Czechowie czy na Czechówce? Glossa do rozważań o krajobrazie kulturowym północno-zachodniej części historycznego Lublina

2019 ◽  
Vol 67 (4) ◽  
pp. 165
Author(s):  
Jacek Chachaj
Keyword(s):  
18Th Century ◽  
River Valley ◽  
Previous Article ◽  
Precise Location ◽  
Architectural Analysis ◽  
The North ◽  
Modern Era ◽  
North Western

The article is a response to the publication of M. Dudkiewicz, W. Durlak and M. Dąbski concerning a non-existent object called a manor or palace that existed in the modern era in the north-western part of Lublin on the edge of a plateau extending northwards from the Czechówka river valley. Since the previous article contains substantive factual errors, this text also attempts to show the ownership changes of the area where the manor existed, and specify its more precise location. The postulate for further research remains primarily the architectural analysis of the building, which in the second half of the 18th century was in an advanced state of decay.

scholarly journals Pyhäjoki – murreraja ja vanha valtaraja?

Virittäjä ◽  
2020 ◽  
Vol 124 (3) ◽  
Author(s):  
Harri Mantila ◽  
Matti Leiviskä
Keyword(s):  
River Valley ◽  
The North ◽  
Verb Forms ◽  
Definition Of

Artikkelissa tarkastellaan keskipohjalaisten ja pohjoispohjalaisten eli Oulun seudun murteiden rajaa. Kettusen murrekartastosta on poimittu kahdeksan piirrettä, jotka erottavat näitä murteita toisistaan. Näitä piirteitä ovat esimerkiksi t:n heikon asteen vastineet ja yksikön 3. persoonan päätteet. Nämä samat piirteet ovat myös itä- ja länsimurteita erottavia piirteitä siten, että keskipohjalaiset variantit ovat läntisiä ja pohjoispohjalaiset itäisiä. Analyysi pohjautuu pääosin Muoto-opin arkiston kokoelmiin. Murreanalyysin tulos on, että kaikki tähänastiset rajanvedot keski- ja pohjoispohjalaisten murteiden välillä ovat olleet liian pohjoisia. Murreraja on toki häilyvä, mutta pohjoispohjalaiset (ja itäiset) variantit ovat vallalla jo heti Pyhäjoella tai sen pohjoispuolella. Artikkelissa palataan myös siihen Kettusen esittämään argumenttiin, että puheena olevien murteiden raja on Pattijoessa, koska se on ollut Pähkinäsaaren rauhan (1323) rajalinja. Tässä Kettunen nojaa historiantutkija Jalmari Jaakkolan näkemykseen. Muissa tutkimuksissa rajaksi on tulkittu Pyhäjoki tai Petäjäisoja. Murreanalyysi tukee vahvasti Pyhäjoen tulkintaa rajajoeksi, varsinkinkin kun historiantutkimuksessa Pyhäjoen voidaan todeta olleen itä- ja länsisuomalaisen asutuksen välinen intressiraja. Viimeaikaisen tutkimuksen mukaan samoille alueille sijoittuu myös geneettinen raja.   River Pyhäjoki – an old dialect boundary and a state border? This article discusses the boundary between the Central and Northern Ostrobothnian (Oulu region) dialects. The focus is on eight dialectal features (taken from Kettunen’s classic dialect map) that separate these dialects. These features include the weak-grade equivalents of t and the endings of 3rd-person singular verb forms. These features are also deemed to separate the eastern and western dialects of Finnish so that the Central Ostrobothnian variants represent the western dialect type and the Northern Ostrobothnian variants represent the eastern type. The present findings are based primarily on the materials of the Finnish Morphological Archive. The results suggest that all former borderlines between the Central and Northern Ostrobothnian dialects were drawn too far to the north. Naturally, the dialect boundary is rather fluid, but most of the Northern Ostrobothnian (and eastern) variants are already represented in the river valley around Pyhäjoki or in the parishes immediately to the north. In addition, the article re-examines Kettunen’s definition of this dialect boundary. Kettunen claims that the boundary runs along the Pattijoki valley, and in his estimation this reflects the borderline of the Pähkinäsaari Treaty (1323), the first treaty between the Swedish Kingdom and Novgorod. Here he cites the views of historian Jalmari Jaakkola. Some historians have subsequently suggested that the borderline ran along either the Pyhäjoki or Petäjäisoja rivers. Dialectological analysis strongly supports the interpretation of Pyhäjoki’s being the border, especially because historians have already proved that Pyhäjoki was once the northernmost border of the western Finnish settlement. According to recent research, it seems that Pyhäjoki represents a genetic border too.

scholarly journals Pleistocene horses (genus Equus) in the central Balkans

2003 ◽  
pp. 55-75 ◽  
Author(s):  
Ann Forsten ◽  
Vesna Dimitrijevic
Keyword(s):  
Late Pleistocene ◽  
River Valley ◽  
Middle Pleistocene ◽  
Mountainous Area ◽  
Migration Routes ◽  
Northern Greece ◽  
The North ◽  
Time Period ◽  
Morava River ◽  
River Valleys

A review of the fossil horses of the genus Equus from the central Balkans, a mountainous area comprising Serbia and Montenegro, is presented in this paper. The time period covered by the finds is from the late Early to and including the Late Pleistocene, but the record is not complete: the dated finds are Late Pleistocene in age, while Early and Middle Pleistocene are poorly represented. The horses found resemble those from neighbouring countries from the same time period, probably showing the importance of river valleys as migration routes. The Morava River valley runs in a roughly south-to-north direction, connecting, via the Danube and Tisa River valleys the Hungarian Pannonian Plain in the north with northern Greece in the south, via the Vardar River valley in Macedonia. In Pleistocene, large mammals, including horses, probably used this route for dispersal.

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