Reidentifying Depositional, Solifluction, “String Lobe” Landforms as Erosional, Topographic, Steps & Risers Formed by Paleo-Snowdunes in Pennsylvania, USA

IF 0.3 4区 哲学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Earth Sciences History Pub Date : 2021-06-30 DOI:10.11648/J.EARTH.20211003.19
Michael Iannicelli
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Abstract

A controversy arises concerning relict, ubiquitous, depositional, solifluction, “string lobe” landforms in the Ridge and Valley province of Pennsylvania, reported by other investigators. A distinguishment is made here by defending an original interpretation of the particular landforms which identified these as snowdune meltwater-eroded depressions formed within colluvium during cold phases of the Pleistocene Epoch. Hence, the landforms are reassessed as “steps & risers” in this study which is jargon associated with nival erosion. The reidentification is warranted in the study because of multiple lines of evidence including: the landforms’ detailed geomorphology and sedimentology; the landforms having a highly, unusual, very repetitive, NE-SW orientation; and the landforms incurring a striking, gravity-defying, characteristic of running-water erosion repeatedly occurring irrespective of the steepest part of the general slope. Besides the evidence offered here, the study also gives insight, resolutions and re-confirmations in order to establish absolute identification while differentiating between discussed, periglacial, relict landforms. An agreement is reached however, regarding actual, true solifluction landforms occurring only on slopes that point in a particular, general direction.
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美国宾夕法尼亚州古沙丘形成的侵蚀、地形、台阶和上升的沉积、溶蚀、“串状叶”地貌的再识别
由其他研究人员报道的关于宾夕法尼亚山脊和山谷省的遗存的、普遍存在的、沉积的、孤立的、“弦瓣”地貌的争议。在这里,通过捍卫对特定地貌的原始解释来进行区分,该解释将这些地貌确定为更新世时期寒冷时期在崩积层内形成的雪丘融水侵蚀洼地。因此,在本研究中,地形被重新评估为“台阶和上升”,这是与土壤侵蚀相关的术语。由于多种证据,包括:地形的详细地貌和沉积学;地形具有高度的,不寻常的,非常重复的,东北-西南方向;这些地形具有显著的、不受重力影响的特点,即流水侵蚀反复发生,而不管一般斜坡的最陡部分如何。除了这里提供的证据外,该研究还提供了见解,决议和重新确认,以便在区分讨论过的冰川周围的遗迹地貌时建立绝对的识别。然而,对于只发生在指向特定方向的斜坡上的实际的、真正的溶蚀地貌,人们达成了一致意见。
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来源期刊
Earth Sciences History
Earth Sciences History GEOSCIENCES, MULTIDISCIPLINARY-HISTORY & PHILOSOPHY OF SCIENCE
CiteScore
1.00
自引率
0.00%
发文量
1
审稿时长
>12 weeks
期刊介绍: Earth Sciences History promotes and publishes historical work on all areas of the earth sciences – including geology, geography, geophysics, oceanography, paleontology, meteorology, and climatology. The journal honors and encourages a variety of approaches to historical study: biography, history of ideas, social history, and histories of institutions, organizations, and techniques. Articles are peer reviewed.
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