Lee, D.-C. February 2017. Radialimbricatus, a new ichnogenus from the lacustrine sandstone facies of the Lower Cretaceous Jinju Formation, South Korea. Alcheringa XX, XXX–XXX.
The trace fossil Radialimbricatus igen. nov. with type species of R. bitoensis isp. nov. occurs in river-mouth-bar sandstone beds of a lacustrine sequence of the Lower Cretaceous Jinju Formation in South Korea. Radialimbricatus is a horseshoe-shaped or elliptical, convex hyporelief structure characterized by imbrication of traces with radial ridges and a median furrow. These features differentiate Radialimbricatus from arthropod ichnofossils such as Rusophycus and Cruziana, possibly cnidarian ichnofossils such as Astropolichnus and vermiform organism ichnofossils such as Oldhamia. Cross-sectional features of R. bitoensis, including upward mud protrusions at lateral margins, demonstrate that R. bitoensis can be formed as an open epigenic furrow at the water/mud interface or an endogenic burrow along the sand/mud interface at the same time. Analysis of discrete and imbricating horseshoe-shaped traces indicates that the tracemaker maintained an obligate inclined posture even when forming trails. The radial ridges and pit along the median furrow are interpreted to reflect feeding behaviour, and the imbrication to result from unidirectional and more or less regular movements to next feeding sites. The tracemaker is thought to have been an organism with an elliptical body outline, radially arranged body parts at the base of or around the body (probably for collecting and transporting foods and moving to feeding sites) and a mouth near the centre of the body, which is consistent with body plan features of arthropods, cnidarians and annelids.
Dong-Chan Lee [dclee@chungbuk.ac.kr], Department of Earth Sciences Education, Chungbuk National University, Cheongju, 28644, South Korea.相似文献
Chinese popular music, inspired by pre-war Shanghai music known as ‘shidai qu’ (时代曲) (songs of the era) and evolving to include Canto pop and Taiwanese Mandarin songs, has always been popular among the Chinese in Malaysia. This music is featured on radio, television, karaoke, and performed by orchestras such as the Dama Chinese Orchestra (大马) to enthusiastic reception. The songs have a broad appeal that transcends time, generation, and place. Of significance is the observation that the music has become a cultural marker and musical heritage for Chinese in Malaysia and in the region. The paper looks at factors behind this development. 相似文献
Although the First World War highlighted human vulnerability through the terrors of a mechanised warfare ravaging the male body in new ways, it also fostered moments of intimacy and tenderness that privileged commonality, mutuality, and generosity, and encouraged friendship and comradeship as cornerstones of martial masculinities. This article explores such intimacies through analysis of letters and diaries written by British Royal Flying Corps airmen during combat on the Western Front. Informed by history of emotions approaches, I discuss the ways the sensual geographies of aerial combat and their promise of mastery and expanded vision shaped the emotional topographies of airmen’s combat lives. Following Santanu Das’s scholarship on the claustrophobic haptic geographies of trench warfare, this article addresses the following question: If the claustrophobia of the trenches and the impoverishment of visual experience facilitated certain geographies of senses that shaped male intimacies, what might similar emotional terrains look like for airmen exposed to more expansive visual practices? 相似文献
Paleozoologists have long used taxa represented by ancient faunal remains to reconstruct paleoenvironments. Those ancient environments were the selective contexts in which hominin biological and cultural evolution took place. Knowing about those particularistic selective environments and how organisms responded to them is increasingly seen as critically important to identifying both how biota will respond to future (to some degree anthropogenically driven) environmental change, and biological conservation and management applications that will ensure sustainability of ecological resources and services. Reconstructing paleoenvironments requires knowledge of species’ ecological tolerances, geographic ranges, habitats, environments, and niches. It also requires assumptions that extant species had the same ecological tolerances in the past as they do today and that changes in taxonomic composition or abundances reflect environmental change rather than sampling or taphonomic factors. Greater knowledge of ecological processes as well as increased analytical sophistication in paleozoology is providing increasingly rigorous and detailed insights to paleoenvironments. 相似文献
Relying heavily upon historical records to build archaeological chronologies, many Korean historical archaeologists question the utility of radiocarbon dating. To challenge this tendency, we test a model based on historical records by analyzing radiocarbon dates. We dated two bulk samples from Hongryeonbong Fortress II, Seoul, South Korea, which is known historically to have been occupied between a.d. 500 and 551. By dividing bulk samples into smaller aliquots, we dated 40 subsamples and statistically estimated consensus dates. The consensus dates do not support expectations of the historical model, as they do not lie within the temporal range provided by historical records. We propose an alternative model that explains both the radiocarbon dates and the historical records. It is suggested that radiocarbon dating can be successfully applied to the reconstruction of historical periods and is a way of mitigating possible biases of models based solely on historical records. 相似文献
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