Biogenic Sedimentary Structures Formed By Rays

@article{Howard1977BiogenicSS,
  title={Biogenic Sedimentary Structures Formed By Rays},
  author={James D. Howard and Taylor V. Mayou and Richard W. Heard},
  journal={Journal of Sedimentary Research},
  year={1977},
  volume={47},
  pages={339-346}
}
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… 
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Estuaries of the Georgia coast possess a wide variety of sedimentary textures and physical and biogenic sedimentary structures. Sediment grain sizes range from fine mud to pebbles. Physical
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