Stratigraphy of the Maastrichtian deposits of the Kakanaut rive basin (Eastern part of Koryak Upland)

Palaeobotany ◽  
2010 ◽  
Vol 1 ◽  
pp. 96-119 ◽  
Author(s):  
L. B. Golovneva ◽  
S. V. Shchepetov
Keyword(s):  
Polar Region ◽  
Field Work ◽  
Northeastern Russia ◽  
Fossil Plants ◽  
Pyroclastic Deposits ◽  
Basaltic Rocks ◽  
Stratigraphic Position ◽  
Definition Of ◽  
Early Paleogene ◽  
Koryak Upland

Recent discovery of rich dinosaur fauna at high latitudes in northeastern Russia required the additional investigation of the Kakanaut locality for more precise definition of its age and stratigraphic position. This locality is situated in the southern part of the Koryak Upland, in the Kakanaut River basin near Pekulneyskoe Lake (Chukotka Autonomous Region). In the result of field work 2007-2009, five particular sections were described and joint geological column of the Maastrichtian deposits was composed. In this column three parts were distinguished: the marine siltstone strata, the Kakanaut Formation and the Kokuy strata. The Maastrichtian deposits are covered by effusive-pyroclastic deposits (possibly, early Paleogene in age). The marine siltstone strata contains inocerams and ammonites of the lower and lower part of upper Maastrichtian (Inoceramus (Cataceramus) pilvoensis Sok., Schachmaticeramus shikotanensis (Nagao et Mat.) Schachmaticeramus kusiroensis (Nagao et Mat.). Hypophylloceras marshalli (Shimizu), Diplomoceras sp., Pachydiscus subcompressus Mat.). The Kokuy strata contains remains of the late Maastrichtian-early Palaeocene foraminifers (Rzehakina epigone zone) and of undetermined fragments of ammonites. The Kakanaut Formation are represented by nonmarine volcanogenous-terrigenous sediments. It consists of tuffaceous sandstone and siltstones, tuffs, tuffites and andesite-basaltic rocks and represents lacustrine and fluviodeltaic deposition on near-sea lowland. These deposits contain joint association of fossil plants and dinosaur bones, teeth and eggshell fragments. The dinosaur assemblage represented by basal ornithopods, hadrosaurids, ankylosaurians, neoceratopsians, troodontids, dromaeosaurids and tyrannosaurids. Dinosaur eggshell fragments, belonging to hadrosaurids and non-avian theropods, indicate that at least several dinosaur taxa could reproduce in polar region. The Kakanaut flora includes about 50 taxa. The cycadophytes (Nilssonia, Encephalartopsis) and Ginkgo are very abundant in certain layers. The conifers are represented by mixture of the typical Late Cretaceous elements with an admixture of younger Paleocene elements belonging to families Taxodiaceae, Cupressaceae and Pinaceae. Angiosperms include about 30 species. Families that can be confidently recognized are Platanaceae (Platanus), Cercidiphyllaceae (Trochodendroides), Betulaceae (Corylus), Fagaceae (Fagopsiphyllum), Rosaceae (Peculnea, Arctoterum). Other species appear to belong to ancient groups, without clear phylogenetic links to modern taxa. The age of the fossiliferous beds can be estimated as the beginning of late Maastrichtian. The correlation of the Maastrichtian deposits of different areas at eastern part of Koryak Upland was carried out.

Archaeological Explorations in Southwestern Idaho

1965 ◽  
Vol 31 (1) ◽  
pp. 24-37 ◽  
Author(s):  
Earl H. Swanson
Keyword(s):  
19Th Century ◽  
Great Basin ◽  
Field Work ◽  
Snake River ◽  
Boundary Zone ◽  
The North ◽  
Definition Of ◽  
The 19Th Century

AbstractField work in southwestern Idaho in 1959 has led to definition of a boundary zone between the Great Basin and Plateau culture areas. Around A.D. 1300, this boundary lay along the Snake River in southwestern Idaho, but in the 19th century it lay nearly 100 miles to the north of the Snake River. It is suggested that the contemporary environment of southwestern Idaho was established about 1000 B.C.

scholarly journals Interstadiale Bodenbildungen in oberitalienischen Würm-Lössen

1960 ◽  
Vol 11 (1) ◽  
pp. 196-205
Author(s):  
Otto Fränzle
Keyword(s):  
Field Work ◽  
Northern Italy ◽  
Stratigraphic Position ◽  
Two Phases

Abstract. Based on field-work and previous publications an attempt is made to outline the distribution of loess in Northern Italy. Five interstadial soils are described. In the Dora Ripária region W of Torino two Würm loesses overly the soliflually eroded plastosol of the Last Inter-glacial. The lower one weathered to a „sol brun lessivé", the upper to an extremely acid „sol lessivé". Also the loess on the Riss moraines of the Dora Báltea glacier was deposited in two phases of the Würm period. The (interstadial and recent) soils developed therefrom, are both extreme pseudogleys, the first of which is rich in former frost wedges. The Mindel gravels of the river Ticino are covered by both Riss and Würm loesses. The extremely pseudogleyed Riss loess has by far more and bigger frost wedges than the older Würm loess, which is weathered into a moderately pseudogleyed braunerde. Two soliflual loesses covering Riss moraines are described from the western Garda region; the lower weathered into a „sol lessivé", the upper into a „sol brun lessivé". E of the lake of Garda an interstadial black earth was found, which had been washed into a valley and then covered by Würm moraines. Finally the developmental climate and the stratigraphic position of the described fossil soils are discussed.

scholarly journals Phaseolus beans (Leguminosae, Phaseoleae): a checklist and notes on their taxonomy and ecology

2021 ◽  
Vol 15 (1) ◽  
pp. 73-111
Author(s):  
D.G. Debouck
Keyword(s):  
South America ◽  
Sea Level ◽  
Field Work ◽  
Seasonally Dry ◽  
Number Of Species ◽  
Recent Increase ◽  
Open Forest ◽  
Definition Of ◽  
Favorable Temperature

This work presents an updated list of the species belonging to the genus Phaseolus following its definition of 1978; it is the outcome of the study of eighty-six herbaria and forty-one explorations in the field in the period 1978–2019. There are currently eighty-one species, all of them native to the Americas, most of them distributed north of Panama (the genus is a migrant into South America), and half of them being known by very few records. They thrive in warm to mild temperate, seasonally dry, open forest, with rains under favorable temperature, from sea level up to 3,000 m. The recent increase in the number of recognized species is due to the endemic ones; this in combination with few unclassified specimens may indicate that the total number of species is not final yet, and that field work will be rewarding.

scholarly journals Pedogenic Forms of Iron in Soils Developed from Four Parent Materials

2020 ◽  
Vol 25 (1) ◽  
pp. 47
Author(s):  
Ayodele Owonubi
Keyword(s):  
Iron Oxides ◽  
Ammonium Oxalate ◽  
Granite Gneiss ◽  
Field Work ◽  
Biotite Granite ◽  
Total Iron ◽  
Basement Complex ◽  
Parent Materials ◽  
Basaltic Rocks ◽  
Forms Of Iron

Information on the distribution of various forms of iron in soils are valuable in the study of soil genesis. The objective of this study was to to evaluate the pedogenic forms of iron in soils developed over basement complex and basaltic parent materials of the study area. Geologic units considered in the basement complex area were granite gneiss, biotite granite and migmatite. Stratified random sampling formed the basis for field work. Soil sampling was carried out by digging at least two soil profile pits in each geologic unit. Organically bound, amourphous and total iron oxides were estimated using 0.1 M sodium pyrophosphate, acidified (pH 3) ammonium oxalate, and dithionite-citrate-bicarbonate method, respectively. The total Fe in the soil samples were determined after a mixed acid digestion. In general, total iron fractions were statistically similar among the soils of basement complex geologic units but significantly lower than those of soils derived from basaltic rocks. However, the distribution of iron oxide fractions was similar among the basement and basaltic geologic units. Furthermore, there were significant differences in the distribution of iron oxides in the B horizons of basement complex derived soils. Consequently, the quantity of iron oxides in the B horizon was in the order migmatite > biotite granite > granite gneiss. About 70% of total iron oxides in the soils over granite gneiss, biotite granite and basaltic rocks was amorphous in nature. Furthermore, total iron oxides constitute less than 20% of total clay both in the basement complex and basaltic soils.

scholarly journals Development of a model of a ground-penetrating radar section of a frozen rock massif with a crack

2021 ◽  
pp. 134-139
Author(s):  
SOKOLOV Kirill Olegovich ◽  
Keyword(s):  
Correlation Coefficient ◽  
Ground Penetrating Radar ◽  
Physical And Mechanical Properties ◽  
Field Work ◽  
Northeastern Russia ◽  
Multiple Reflections ◽  
Mining Operations ◽  
Wave Fields ◽  
Single Formula ◽  
Ground Penetrating

Revelance of the work. The presence of cracks significantly affects the physical and mechanical properties of rocks, which should be taken into account when planning mining operations and building mining facilities. In the conditions of the spread of permafrost rocks, characteristic of northeastern Russia, the study of fracturing is possible by the GPR method, which is used to assess the structure of rock massifs in placer deposits. The criteria for detecting cracks based on the features of wave georadar fields are currently known, and the main problem that prevents the full use of the georadar method for studying cracks in subsurface layers of rocks is the labour-consuming nature of processing and interpreting data from georadar measurements. Purpose of the work – to determine the patterns of cracks occurrence in frozen rocks in GPR wave fields. Methodology of the work. Based on the results of longstanding field work at the developed areas of alluvial diamond deposits in the Anabar region of the Republic of Sakha (Yakutia), the main elements of the radarogram structure were determined and presented in the form of a single formula. The developed formula is implemented in programs in the SCM Matlab and the results of its execution are compared with the results of modeling in the gprMax system. Results of the work and the scope of their application. The resultant formula describes the main elements of GPR radarograms quite correctly, which confirmed their comparison with the obtained model data. The correlation coefficient between the obtained matrices (Matlab and gprMax) without the low-amplitude values of multiple reflections was 0.91, which shows the identity of the structure of GPR wave fields. Conclusions. The studies carried out have confirmed the possibility of a mathematical description of the ground penetrating radar wave field obtained by sounding a mass of frozen rocks with a crack. The high correlation coefficient showed the adequacy of the developed radarogram model, which will be finalized taking into account the directional diagrams of existing georadars.

Galois Involutions

2017 ◽  
Author(s):  
Bernhard M¨uhlherr ◽  
Holger P. Petersson ◽  
Richard M. Weiss
Keyword(s):  
Fixed Points ◽  
Polar Region ◽  
Arctic Region ◽  
The Arctic ◽  
Spherical Building ◽  
Linear Automorphism ◽  
Moufang Condition ◽  
Coxeter Diagram ◽  
Definition Of ◽  
The Arctic Region

This chapter focuses on the fixed points of a strictly semi-linear automorphism of order 2 of a spherical building which satisfies the conditions laid out in Hypothesis 30.1. It begins with the fhe definition of a spherical building satisfying the Moufang condition and a Galois involution of Δ‎, described as an automorphism of Δ‎ of order 2 that is strictly semi-linear. It can be recalled that Δ‎ can have a non-type-preserving semi-linear automorphism only if its Coxeter diagram is simply laced. The chapter assumes that the building Δ‎ being discussed is as in 30.1 and that τ‎ is a Galois involution of Δ‎. It also considers the notation stating that the polar region of a root α‎ of Δ‎ is the unique residue of Δ‎ containing the arctic region of α‎.

New data about the Late Cretaceous floras of the Ulya depression (western coast of Sea of Okhotsk)

Palaeobotany ◽  
2013 ◽  
Vol 4 ◽  
pp. 148-167 ◽  
Author(s):  
L. B. Golovneva
Keyword(s):  
River Basin ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Sea Of Okhotsk ◽  
Northeastern Russia ◽  
Western Coast ◽  
Fossil Plants ◽  
Sedimentary Deposits ◽  
Volcanogenic Belt ◽  
Systematic Composition

New investigation of fossil plants from volcanic-sedimentary deposits of the Amka Formation in Ulya River basin (southern part of the Okhotsk-Chukotka volcanogenic belt, Northeastern Russia) shows, that the Arinda, Uenma, Ust-Amka and Gyrbykan floristic assemblages from diff erent localities of this formation have very close systematic composition. We propose to joint these assemblages in the single regional flora, which is named the Ulya flora. The Ulya flora consists of almost 40 species. The majority of them are represented by new undescribed taxa. In this flora gymnosperms (Phoenicopsis ex gr. speciosa Heer, Ginkgo ex gr. adiantoides (Ung.) Heer, G. ex gr. sibirica Heer, Sphenobaiera sp., Podozamites sp., Elatocladus spp., Araucarites sp., Sequoia sp., Metasequoia sp., Cupressinocladus sp., Ditaxocladus sp., Pityophyllum sp., Pityostrobus sp.) predominate. Ferns (Asplenium dicksonianum Heer, Arctopteris sp., Cladophlebis spp. and several undescribed taxa) and angiosperms (Trochodendroides spp., undetermined Platanaceae, Dicotylophyllum spp., Quereuxia angulate (Newb.) Krysht. ex Baik.) are not abundant. This flora is characterized by presence of the Early Cretaceous relicts (Phoenicopsis, Sphenobaiera and Podozamites), by rarity of angiosperms and by high endemism. On the base of comparison of the Ulya flora with other floras from middle and northern parts of the Okhotsk-Chukotka volcanogenic belt, the age of the Ulya flora is estimated as the Coniacian.

Weathering on volcanic edifices under semi-arid climates. Insights from a regional assessment of the composition of Fogo Island regoliths (Cape Verde)

2021 ◽  
pp. SP520-2021-61
Author(s):  
Marina Cabral Pinto ◽  
Pedro A. Dinis ◽  
Denise Pitta Groz ◽  
Rosa Marques ◽  
Maria Isabel Prudêncio ◽  
...  
Keyword(s):  
Mobile Elements ◽  
Cape Verde ◽  
Regional Assessment ◽  
Pyroclastic Deposits ◽  
Basaltic Rocks ◽  
Basalt Weathering ◽  
Low Humidity ◽  
Moderate Elevation ◽  
Semi Arid ◽  
Climatic Features

AbstractIn this study, the geochemistry and mineralogy of regoliths formed on Fogo Island (Cape Verde), a polygenic stratovolcano built during the Quaternary, are used to assess the geomorphological factors that control the early stages of basalt weathering. Fogo Island soils are mainly derived from relatively homogenous silica-undersaturated basaltic rocks. However, a discernible exotic component is recognised in areas most exposed to prevailing winds by ratios on non-mobile elements that are hosted in different amounts by basaltic rocks (e.g., Th, Sc and Ti). Weathering extent is evidenced by a relative depletion in mobile elements (e.g., Na, Ca, Mg) and an enrichment in non-mobile elements (e.g., Ti, Fe, Sc, Al), the decomposition of the most labile minerals (olivines), and the enrichment in secondary components (phyllosilicates and some Fe-oxides, such as hematite-goethite), along with quartz supplied from non-volcanic areas. It depends on bedrock age and type (pyroclastic deposits vs. lava-flows). In particular, soils covering older volcanic units tend to be more affected by chemical alteration than those overlying younger units. In addition, more intense weathering is observed in locations characterised by a combination of moderate elevation, slopes with low gradient and relatively high rainfall. The present investigation shows that even in low humidity environments recently formed basalt are affected by weathering, with the extent of chemical decomposition being mainly determined by the age of surface exposure and local orographic/climatic features.

BURROWS OF DECAPOD CRUSTACEANS IN PALEOGENE OF MIDDLE VOLGA AND ITS PALEOGEOGRAPHIC SIGNIFICANCE

2018 ◽  
pp. 36-43
Author(s):  
B. T. Yanin ◽  
V. N. Benyamovsky
Keyword(s):  
Decapod Crustacean ◽  
Caspian Basin ◽  
Decapod Crustaceans ◽  
Lower Eocene ◽  
New Finding ◽  
Stratigraphic Position ◽  
Middle Volga ◽  
Early Paleogene ◽  
Upper Paleocene

The description of the new finding of the burrows of decapod crustacean from Upper Paleocene and Lower Eocene deposits relating to two ichnotaxons (Thalassinoides suevicus Rieth and Ophiomorpha nodosa Lundgren), clarifies their stratigraphic position and state the paleogeographic significance for determining eustatic phases in the development of semirestricted Early Paleogene Volga-Caspian basin.

Tea Houses as Third Places in MĀsulih's Vernacular Settlement

2018 ◽  
Vol 43 (2) ◽  
pp. 49-59
Author(s):  
Ehsan Daneshyar
Keyword(s):  
Qualitative Research ◽  
Research Methods ◽  
Field Work ◽  
Qualitative Research Methods ◽  
Third Places ◽  
Tourist Destination ◽  
Daily Routines ◽  
Extended Field ◽  
Definition Of ◽  
Depth Interviews

This article adopts Ray Oldenburg's definition of third places and argues that the eight characteristics of third places are demonstrated in the tea houses of Masulih. In many vernacular communities, participating in informal public gathering places, or third places, is one of the daily routines of local inhabitants. The male inhabitants–including seniors and shopkeepers, as well as the shepherds who migrate seasonally with their herds from plateau of Gilan to Masulih–regularly visit and socialize in Masulih's tea houses. Recently, tourists also have become regular visitors of the tea houses. Qualitative research methods were conducted during extended field work in Masulih during 2008 to 2015. In-depth interviews with local inhabitants placed them as local experts. This allowes for a deeper understanding of the use of the tea houses as third places. In addition, research was conducted through visits to the tea houses at various times of the year in order to record their seasonal usage. While not every vernacular settlement in Iran is a tourist destination, Masulih, with its tea houses integrated in the bazaar, sees regular and steady tourist visitation. Masulih's rich cultural, architectural, and tourist landscape generates a complex research ground. This article suggests that tea houses, as third places, are vital for informal regular gathering of local Masulih residents, seasonal visitors, and tourists.

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