Coal resources of the Cape Lisburne-Colville River region, Alaska

1967 ◽  
Keyword(s):  
Coal Resources ◽  
River Region ◽  
Colville River

Palynology of Maastrichtian and Paleocene rocks, lower Colville River region, North Slope of Alaska

1988 ◽  
Vol 25 (4) ◽  
pp. 512-527 ◽  
Author(s):  
N. O. Frederiksen ◽  
T. A. Ager ◽  
L. E. Edwards
Keyword(s):  
Great Plains ◽  
Pollen Grains ◽  
North Slope ◽  
Northern Great Plains ◽  
Dinoflagellate Cysts ◽  
Spores And Pollen ◽  
The North ◽  
River Region ◽  
Colville River ◽  
North Slope Of Alaska

Outcrops of Maastrichtian rocks are rare on the North Slope of Alaska, and it is even more unusual to find outcrops of Maastrichtian and Paleocene age in the same vicinity. In general, Late Cretaceous and Paleogene rocks have not been well dated in published papers pertaining to northern Alaska. In this article, we describe palynomorph assemblages from 20 outcrop samples taken from nine localities along the lower Colville River and nearby areas. The latest Cretaceous palynomorph assemblages that are from marine rocks contain late Campanian or Maastrichtian dinoflagellate cysts; however, these cysts and other marine fossils are absent from the Tertiary samples, indicating that the Tertiary strata are nonmarine. Our latest Cretaceous and early Tertiary samples contain abundant spores and pollen grains and can be readily dated by reference to well-known pollen assemblages from the northern Great Plains and northwestern Canada. By dating each sampled outcrop, we can approximate the position of the Cretaceous–Tertiary boundary in the study area. Outcrop samples near the boundary are too widely separated stratigraphically to permit us to determine whether or not an unconformity exists at the boundary in the study area. Using spores, pollen grains, and dinoflagellate cysts, we date the samples below the Cretaceous–Tertiary boundary as being of approximately mid-Maastrichtian age and the samples above the boundary as being undifferentiated Paleocene in age. On the North Slope, as in regions to the east and south, the Maastrichtian pollen assemblages represent a different kind of flora and vegetation than the Paleocene assemblages. The Maastrichtian assemblages have moderately high diversities of angiosperm pollen taxa, most of which were probably insect pollinated. In contrast, the Paleocene assemblages have low diversities of angiosperm taxa, and many of these taxa were probably wind pollinated. Differences between the mid-Maastrichtian and Paleocene assemblages may have been caused at least in part by climatic changes but may also have been caused by the effects of a hypothesized bolide impact at the end of the Maastrichtian for which there is increasing evidence.

Divergent Memories of Tumen Shan-shui

2019 ◽  
pp. 229-10.33526/EJKS.20191901.229
Author(s):  
Xiaoxuan Lu
Keyword(s):  
Lived Experience ◽  
North Korea ◽  
Research Study ◽  
States Of Mind ◽  
Geographical Research ◽  
River Region ◽  
Production Techniques ◽  
Landscape Research ◽  
Border Areas ◽  
The Creation

Focusing on the interplay between memory and place, this article examines the rationale behind the use of axonometric drawings (axons) in a geographical research study of the Tumen/Tuman River region encompassing the borders shared by China, Russia and North Korea. The concepts of “memory of place” and “place of memory” guide the structure of this project and the flow of this article. “Memory of place” emphasises the lived experience of our physical senses, and helps determine the great potential of visual methodologies in the fields of geographical and landscape research and study. Drawn up using the graphic production techniques of abstracting, foregrounding, highlighting and juxtaposing, axons avail themselves of and inform both realist and idealist states of mind. In contrast, “place of memory” references a particular type of materiality and helps us understand Tumen Shan-shui as a library of memories that reveals a profusion of contested aesthetic, cultural and political meanings. Axons serve to tell narratives revealing desires, actions and undertakings that have shaped and continue to shape the substance of the memory sites in question including infrastructure, architecture and signage. Initially adopted by the author as a medium for recording and communicating due to security restrictions imposed in the border areas in question, the creation of axons generated new insights on methods of documentation in landscape research, and the places and landscapes themselves.

ESTIMATION OF THE T-YEAR SPECIFIC DISCHARGE USING THE REGIONALISED SKEWNESS COEFFICIENT OF THE LOG-PEARSON TYPE III DISTRIBUTION

2020 ◽  
Author(s):  
Jakub Mészáros ◽  
◽  
Pavol Miklánek ◽  
Pavla Pekárová ◽  
◽  
...  
Keyword(s):  
River Basin ◽  
Type Iii ◽  
River Region ◽  
Pearson Type ◽  
Skewness Coefficient ◽  
Distribution Parameters ◽  
Design Values ◽  
Specific Discharge ◽  
Morava River ◽  
Pearson Type Iii Distribution

In this paper the results are presented of estimation of T-year specific discharge of several streams in two regions in Slovakia. The Qmax time series used in the study were observed at water gauges from lowland Slovak part of the Morava River basin, and from the mountainous Belá River basin. For estimating the design values, we have studied the use of only one type of probability distribution, namely the Log-Pearson Type III Distribution (LP3 distribution). The use of only one type of distribution brings several benefits, e.g. possibility of the regionalization of the distribution parameters (in this study skew coefficient). In the first step the design values of the specific discharge series qmax (with historical data) were estimated and regional skew coefficients Gr of the LP3 distribution were computed. Regional skewness coefficient Gr was estimated to be 0.38 in the Morava River region, and 0.73 in the Belá River region. In many cases the estimate of the 1000-year specific discharge is two times higher than the value of the 100-year specific discharge. Then we have derived the empirical relations between station skew coefficient G and the elevation of the water gauge. In the second step we have derived the empirical relationships between 1000-years specific discharge q1000 and the elevation of the water gauge for both regions separately. The derived empirical regional equations can be used to estimate the 1000-years specific discharge of other streams in the region.

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