Biogenic Sedimentary Structures Formed By Rays
Biogenic Sedimentary Structures Formed By Rays
复制标题
射线形成的生物沉积结构
DOI：
10.1306/212f7167-2b24-11d7-8648000102c1865d
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发表时间：
1977
影响因子：
2
通讯作者：
R. Heard
中科院分区：
文献类型：
--
作者：
J. D. Howard;Taylor V. Mayou;R. Heard
在乔治亚海岸的潮滩、河口沙洲和河道中，由鳐类（板鳃类）的摄食活动所造成的挖掘极其丰富。射线通过拍打“翅膀”进行挖掘，以水力侵蚀基质，从而获得底栖生物作为食物。随后，这个洞又被新的沉积物填满。这种进食活动产生的结构由两部分组成：一个宽而浅的碟形表面凹陷和一个深30厘米的大致圆形的较低孔。射线形成的补给洼地是独特的沉积构造，在全新世沉积物的岩心中很容易识别。最近在更新世和白垩纪露头也发现了它们。
ABSTRACT Excavations made by the feeding activity of rays (elasmobranchs) are extremely abundant in tidal flats and in estuarine sand bars and channels of the Georgia coast. Rays make excavations by flapping their "wings" in order to erode the substrate hydraulically and thereby obtain benthic organisms for food. Subsequently, the hole is refilled with new sediment. The structure that results from this feeding activity is composed of two parts: a broad, shallow, surface depression that is dish-shaped and a lower, roughly circular hole as much as 30 cm deep. Feeding depressions formed by rays are distinctive sedimentary structures that are easily recognized in cores from Holocene sediments. Recently they have also been found in Pleistocene and Cretaceous outcrops.