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首页> 外文期刊>Palaios: An International Journal of the Society of Economic Paleontologists & Mineralogists >EARLY MIOCENE SHOREBIRD-LIKE FOOTPRINTS FROM THE EBRO BASIN, LA RIOJA, SPAIN: PALEOECOLOGICAL AND PALEOENVIRONMENTAL SIGNIFICANCE
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EARLY MIOCENE SHOREBIRD-LIKE FOOTPRINTS FROM THE EBRO BASIN, LA RIOJA, SPAIN: PALEOECOLOGICAL AND PALEOENVIRONMENTAL SIGNIFICANCE

机译：西班牙拉里奥哈省埃布罗盆地早期中新世象脚类古动物：古生态学和古环境的意义

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Small shorebird-like footprints have been discovered in Cenicero (La Rioja, Spain). They are preserved in a sandstone block of the transition unit between the Najera and Haro Formations from the Ebro Basin. This level is positioned in the Y2 local zone (MN2), of Agenian age (early Miocene). The footprints are small, tridactyl or tetradactyl, with slender and proximally unconnected digit impressions. They have phalangeal pads and claw marks, and there is no evidence of a web or metatarsal pad. The footprints are compared with other shorebird-like ichnotaxa and assigned to the Cretaceous ichnotaxon Koreanaornis isp., which is herein identified for the first time in the Cenozoic. Other shorebird-like footprints from the late Eocene to early Miocene in the Ebro Basin and the early Miocene ichnotaxa Aviadactyla media and Aviadactyla vialovi are also related to this ichnotaxon. In addition to the shorebird-like footprints, the Cenicero tracksite has invertebrate traces and sedimentary and organic structures typical of the Scoyenia ichnofacies, suggesting a mud-dominated floodplain in a central-distal alluvial fringe as the paleoenvironment. The morphology, habitat, and behavior inferred from the shorebird-like footprints in the Cenicero tracksite are similar to other fossil footprints found in the Mesozoic and Cenozoic as well as to modern shorebird tracks. This is likely due to morphological, ecological, and behavioral convergences among different avian clades from the Early Cretaceous to the present.
机译：在Cenicero（西班牙拉里奥哈）发现了类似小水鸟的脚印。它们保存在埃布罗盆地纳杰拉和哈罗地层之间过渡单元的砂岩块中。该层位于阿格尼西亚年龄（中新世早期）的Y2局部区域（MN2）中。脚印很小，是三d基或四d基，有细长的和近端未连接的手指印模。它们有指骨垫和爪痕，没有网或or骨垫的迹象。将足迹与其他水鸟状鱼鳞纲进行比较，并将其分配给白垩纪鱼鳞状朝鲜蓟isp。，这在新生代中是首次被识别。从新世晚期到埃布罗盆地中新世早期和中新世鱼鳞目早期的其他类似鸟鸟的足迹也与该鱼鳞纲有关。Aviadactylamedia和Aviadactyla vialovi。除了类似bird鸟的脚印外，Cenicero遗址还具有无脊椎动物的痕迹以及Scoyenia鱼类的典型沉积和有机结构，表明在中-远冲积带中以泥浆为主的洪泛区为古环境。从Cenicero径迹中的bird鸟形足迹推断出的形态，栖息地和行为与在中生代和新生代以及现代bird鸟径迹中发现的其他化石足迹相似。这可能是由于从早白垩世到现在的不同鸟类进化枝之间的形态，生态和行为趋同。

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