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徐州地区分布一些晚新近纪和第四纪沉积物并产出哺乳动物化石,但大多数地点的化石未做详细研究。研究徐州地区的哺乳动物化石,不仅可以限定该地区的生物年代范围,明确古动物地理属性,还可以为重建该区域古环境提供化石证据。本文详细描述了产自徐州太平山3号和凤凰山5号两个地点的小哺乳动物化石,其中太平山有2目4科6属6种,凤凰山有2目5科8属8种,太平山的6种在凤凰山地点都有出现,表明两个地点的小哺乳动物化石组合时代可能相同或非常接近。太平山和凤凰山的小哺乳动物化石中,只有变异相似仓鼠为灭绝种,其余均为现生种,低的灭绝种占比显示它们的生物年代应为更新世中晚期。太平山和凤凰山的小哺乳动物化石组合中绝大多数都是古北界物种,具有明显的北方动物群面貌。森林型(大林姬鼠和灰麝鼩)、森林草原型(根田鼠)和草原型(布氏田鼠)物种的共存指示在更新世中晚期,徐州地区可能是森林和草原的混合环境。基于现生种现今分布地区气象数据的随机森林算法计算得到7个现生种共存的古年均降水量和古年均温重建值分别为768.58 mm和10.83℃,较徐州地区现今气候(845.5 mm、15.3℃)更干燥凉爽。
Abstract：Some Late Neogene and Quaternary sediments have been identified in Xuzhou, Jiangsu, East China, and mammalian fossils were reported from a number of sites. However, most of these sites remain poorly studied. The study of mammal fossils in Xuzhou can specify their biochronological range, clarify the paleozoogeographical attribution, and provide fossil evidence for the environmental reconstruction of the region in the past. This paper presents a detailed description of the small mammal fossils from two localities in Xuzhou: Taipingshan Loc.3 and Fenghuangshan Loc.5. The former has yielded six species of four families under two orders, and the latter has produced eight species of five families under two orders. All six species from Taipingshan Loc.3 are also present in the Fenghuangshan Loc.5, suggesting that the fossil assemblages from these two localities may be contemporaneous or very close in age. Among the small mammal fossils from the two sites, only Cricetinus varians is extinct, and the rest are extant. The low percentage of extinct species suggests that they should be dated to the Middle to Late Pleistocene. The extant species of the small mammals belong predominantly the Paleoarctic realm, exhibiting a distinctly boreal faunal appearance. The coexistence of forest-adapted species(Apodemus peninsulae and Crocidura attenuata), forest steppe-adapted species(Alexandromys oeconomus), and steppe-adapted species(Lasiopodomys brandtii) indicates that the Xuzhou area might be a mixed environment of forests and steppes in the Middle to Late Pleistocene. The Random Forest algorithm, utilizing the meteorological data from the extant species' present distribution areas, has yielded the paleo-mean annual precipitation(paleo-MAP) and paleo-mean annual temperature(paleo-MAT) for the coexistence of the seven extant species. These values, designated 768.58 mm and 10.83℃, indicate slightly drier and cooler than contemporary conditions(845.5 mm and 15.3℃), respectively.
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基本信息:
DOI：10.19839/j.cnki.dcxzz.2025.0029
中图分类号:P534.631;Q915.2
引用信息:
[1]常美静,江左其杲,李世杰,等.徐州更新世中晚期小哺乳动物化石新发现及其生物年代、古动物地理和古环境意义[J].地层学杂志,2025,49(04):524-538.DOI:10.19839/j.cnki.dcxzz.2025.0029.
基金信息:
国家重点研发计划(2023YFF0804500); 国家自然科学基金重点项目(42430207)共同资助
2025-11-26
2025-11-26
2025-11-26