Arid
DOI10.1016/j.palaeo.2012.06.026
Pink fairy armadillo meniscate burrows and ichnofabrics from Miocene and Holocene interdune deposits of Argentina: Palaeoenvironmental and palaeoecological significance
Melchor, Ricardo N.1,2; Genise, Jorge F.3; Umazano, Aldo M.2; Superina, Mariella4
通讯作者Melchor, Ricardo N.
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2012
卷号350页码:149-170
英文摘要

The possible producer and environmental setting of large meniscate burrows (Nagtuichnus meuleni igen. and isp. nov.) occurring in late Miocene and Holocene aeolian deposits from Argentina are discussed. These are unbranched burrows with an uniform meniscate filling that range in width from 46 to 78 mm. N. meuleni distinguishing features are a filling composed of a discontinuous. outer massive layer between a central meniscate core and the excavation boundary, sets of parallel ridges in the external wall, and a particular outline plus the presence of paired pits in the concave surface of menisci (or hollows in the convex surface). The late Miocene lower member of the Rio Negro Formation at La Loberia (Rio Negro province) is interpreted as aeolian dune, damp interdune and dry interdune deposits. The Holocene sediments from Gran Salitral (southwestern La Pampa province) represent aeolian dune, wet interdune and dry interdune deposits. N. meuleni occurs only in damp and dry interdune deposits. The composite ichnofabric produced by N. meuleni in the Holocene of the Gran Salitral is composed of two suites of trace fossils. A former Skolithos suite includes Skolithos linearis, Taenidium barretti, Polykladichnus aragonsis and root traces developed in lacustrine calcareous mudstone deposits (wet interdune). This suite is overprinted by N. meuleni, with subordinate participation of S. linearis and root traces, composing the Nagtuichnus suite. The later suite is developed in brown silt and sand of dry interdune areas. The Nagtuichnus ichnofabric is considered indicative of clamp to dry interdune facies of late Miocene to Holocene age. The burrow systems of the likely producers of the Holocene N. meuleni structures were studied in the field and in the laboratory. The candidates were selected from the extant local fauna of the Gran Salitral, including southern cavies (Microcavia australis, Rodentia), tuco-tucos (Ctenomys azarae, Rodentia), and pink fairy armadillos or pichiciegos (Chlamyphorus truncatus, Xenarthra). The most likely producer of N. meuleni are pichiciegos because they have fully subterranean habits and insectivorous diet involving the production of long, unbranched, horizontal burrows excavated in sand, which are mostly backfilled. In contrast to this, tuco-tucos and southern cavies, which are herbivores that forage aboveground, use their more permanent burrows for dwelling and reproduction. As observed in a live, captive-kept C. truncatus, the meniscate structure of the fill can be explained by the animal packing the excavated sand with its rump plate. This mechanism also results in a massive layer of sediment in the burrow fill. Other significant bioglyphs that are a sort of fingerprint of pichiciegos are the outline of menisci in cross-section (mimicking their rump plate) and pairs of rounded pits in the concave surface of menisci (probably tail traces). (C) 2012 Elsevier B.V. All rights reserved.


英文关键词Nagtuichnus meuleni isp and igen. nov. Vertebrate burrows Pink fairy armadillo Bioglyphs Neoichnology Aeolian facies Interdune
类型Article
语种英语
国家Argentina
收录类别SCI-E
WOS记录号WOS:000308685800012
WOS关键词CTENOMYS-MENDOCINUS ; BEAUFORT GROUP ; WILLWOOD FORMATION ; FOSSORIAL RODENT ; POCKET GOPHER ; BIGHORN BASIN ; NAMIB DESERT ; PATAGONIA ; SANDSTONE ; SYSTEM
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174312
作者单位1.Consejo Nacl Invest Cient & Tecn, INCITAP, RA-6300 Santa Rosa, La Pampa, Argentina;
2.Univ Nacl La Pampa, RA-6300 Santa Rosa, La Pampa, Argentina;
3.Museo Argentino Ciencias Nat Bernardino Rivadavia, CONICET, Div Icnol, RA-1405 Buenos Aires, DF, Argentina;
4.CCT CONICET, IMBECU, Lab Endocrinol Fauna Silvestre, RA-5500 Mendoza, Argentina
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GB/T 7714
Melchor, Ricardo N.,Genise, Jorge F.,Umazano, Aldo M.,et al. Pink fairy armadillo meniscate burrows and ichnofabrics from Miocene and Holocene interdune deposits of Argentina: Palaeoenvironmental and palaeoecological significance[J],2012,350:149-170.
APA Melchor, Ricardo N.,Genise, Jorge F.,Umazano, Aldo M.,&Superina, Mariella.(2012).Pink fairy armadillo meniscate burrows and ichnofabrics from Miocene and Holocene interdune deposits of Argentina: Palaeoenvironmental and palaeoecological significance.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,350,149-170.
MLA Melchor, Ricardo N.,et al."Pink fairy armadillo meniscate burrows and ichnofabrics from Miocene and Holocene interdune deposits of Argentina: Palaeoenvironmental and palaeoecological significance".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 350(2012):149-170.
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