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Trend-surface analysis of planation surfaces, with an East African case study
Published in Richard J. Chorley, Spatial Analysis in Geomorphology, 2019
A typical example of an isobase study, within the British Isles, is that by Smith, Sissons and Cullingford (1969). The height of the back of the main Perth raised shoreline was established to 0.1 ft (0.305 m), and its location to the nearest 10 m, at 500 data points. This raised beach occurs in a number of localities separated, for example, by wide estuaries. Trend-surface analysis suggested no grounds for separating the measured beaches into two or more different levels. The data were thus used to test the theory that emergence was in the form of an elliptical isostatic dome. The important point here is that the analysis was carried out to test two hypotheses initially conceived through a geomorphological analysis of the field data. This is in contrast to some uses of the technique as a hypothesis-generating procedure.
Distribution of rocks at and below the surface
Published in A.C. McLean, C. D. Gribble, Geology for Civil Engineers, 2017
Radiocarbon (14C) dating is used to date recent deposits, particularly glacial or raised-beach deposits formed during the last ice age. It is also a method commonly used to date artefacts obtained from various archaeological sites.
Characterization and Spatial Abundance of Microplastics in the Coastal Regions of Cox’s Bazar, Bangladesh: An Integration of Field, Laboratory, and GIS Techniques
Published in Soil and Sediment Contamination: An International Journal, 2022
Mahir Tajwar, Md. Yousuf Gazi, Subrota Kumar Saha
The studied region signifies a salt marsh or raised beach and extends from tourist spot Laboni point, Cox’s Bazar to the North up to Bardeil, Teknaf to the South that covers a distance of about 45 km along the Cox’s Bazar-Teknaf marine drive which includes Jhautola, Laboni Point, Kolatoli, Daria Nagar, Himchori, Pechardwip, Sonar Para Bazar, Inani, Shamlapur, and Bardeil (Figure 1). It represents a raised beach, an interface between a cliff and the open sea extended from Cox’s Bazar to Teknaf. The deposits of the raised beach are the Holocene sediments overlying the erosional surface of the Tertiary successions. The area is readily exposed to the longshore current and periodic tidal oscillations (Alam et al. 2003). It is also visited by cyclonic wash-over frequently in the event of storm surge. The area is drained by the streams namely the Matamuhuri, the Bakkhali, and the Naf. Some canals and channels such as the Rejukhal, the Maheshkhali channel, and the Kutubdia channel are also present here. (Monsur 1995).
Geology of New Zealand’s Sub-Antarctic Islands
Published in New Zealand Journal of Geology and Geophysics, 2019
James M. Scott, Ian M. Turnbull
Other fluvioglacial or fluvial deposits are of limited extent. There are small areas of pebbly stream alluvium at the heads of most of the eastern bays. Oliver et al. (1950) reported raised beach deposits of gravel and sand at Northwest Bay Beach and near Six Foot Lake, which is 2 m above sea level. A large landslide was mapped south of the Menhir by Oliver et al. (1950); the northern slope of Mt Dumas draining to Limestone Point, below a scarp at 170 m ASL, is also inferred to be a large landslide (Turnbull et al. 2004).