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首页> 外文期刊>Acta Palaeontologica Polonica >Ecomorphological and taphonomic gradients in clypeasteroid-dominated echinoid assemblages along a mixed siliciclastic-carbonate shelf from the early Miocene of northern Sardinia, Italy
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Ecomorphological and taphonomic gradients in clypeasteroid-dominated echinoid assemblages along a mixed siliciclastic-carbonate shelf from the early Miocene of northern Sardinia, Italy

机译：意大利北部撒丁岛早期内科酸纤维碳酸盐架的含硅淤积架的生态晶体和术梯度

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摘要

Clypeasteroid echinoids are widespread and abundant within Miocene sedimentary sequences of the Mediterranean area within both siliciclastic and carbonate deposits. Herein, three clypeasteroid-dominated echinoid assemblages from the mixed siliciclastic-carbonate succession of the Mores Formation (lower Miocene) cropping out within the Porto Tones Basin (northern Sardinia) are described. These assemblages were compared to previously described clypeasteroid-bearing deposits from the Miocene of northern Sardinia with the purpose of investigating their palaeoecology and taphonomy along a shelf gradient. These goals are accomplished by various methods including (i) logging sedimentary facies, (ii) analysing the functional morphology of sea urchin skeletons, (iii) comparing the relative abundance of taxa and taphonomic features, and (iv) studying associated fauna, flora, and trace fossils. The clypeasteroid-bearing deposits differ greatly with respect to echinoid diversity, accompanying fauna and flora, sedimentological signatures, and taphonomic features. They also show variations in depositional environments and the mechanism of formation of the deposits. Three different shelf settings are distinguished: littoral, inner sublittoral, and outer sublittoral environments. Furthermore, an ecomorphological gradient along the shelf is recognized with respect to echinoid taxa and their morphologies. This gradient ranges from shallow water to a moderately deep shelf and is interpreted with respect to both abiotic and biotic factors as well as the taphonomy of the echinoid tests.
机译：含有硅藻土沉积物内的地中海区域的中肾上腺沉积序列中的含甘蔗酸异质呼吸素存在普遍和丰富。在此，描述了来自Mores地层（下氨基烯）的混合硅硅酸盐碳酸酯连续的三种含有硅基碳酸酯的呼吸素组合，这些硅酸盐碳酸盐硅酸盐（下氨基烯）在波尔图盆地（北部撒丁岛）内造成的混合型碳酸盐碳酸盐继任数。将这些组件与先前描述的氨化糖尿中沉积物进行比较，目的是沿着架子梯度调查它们的古生学和TaphOnaly。这些目标是通过各种方法完成的，包括（i）伐木沉积相，（ii）分析海胆骨骼的功能形态，（iii）比较了分类群的相对丰富和撰写的特征，（iv），与（iv）学习相关的动物群，Flora，和追踪化石。含有含有动物区群和植物群，沉积学签名和绘制特征的呼吸素多样性，综合含量沉积物很大程度上不同。它们还显示沉积环境的变化和沉积物的形成机制。区分三种不同的架子设置：沿着沿海，内址孔和外档环境。此外，沿着搁架的生态型梯度被识别出相对于呼吸素分类和它们的形态。这种梯度从浅水到适度的深层架子，并被反思是非生物学和生物因素的解释，以及呼吸素试验的Tawhonomicy。

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