. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Figure 70-14a. Radiograph of large amphi- pod (Ampelisca macrocephala) tube struc- tures occurring in great abundance in fine transgressive sand of central Chirikov Basin. Box core 237 from water depth of 27 m. Figure 70-14b. Field photograph of surface of box core 237 taken immediately after collection. Silt-like, mucus-lined burrows shown are typical of large amphipod species Ampelisca Figure 70-14. Intermediate-burrowing (0-10 cm) organisms and
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Figure 70-14a. Radiograph of large amphi- pod (Ampelisca macrocephala) tube struc- tures occurring in great abundance in fine transgressive sand of central Chirikov Basin. Box core 237 from water depth of 27 m. Figure 70-14b. Field photograph of surface of box core 237 taken immediately after collection. Silt-like, mucus-lined burrows shown are typical of large amphipod species Ampelisca Figure 70-14. Intermediate-burrowing (0-10 cm) organisms and their structures. of several interacting factors. The prodelta area is subject to intense and frequent wave reworking because of its extreme shallowness. In addition, the shape of Norton Sound acts to focus storm-surge set-up of water level (Fathauer 1975), and this in turn results in development of strong bottom currents as storm-surge water runoff moves northward from the region (Fleming and Heggarty 1966, Nelson and Creager 1977). Such runoff currents are probably the last mechanism of a storm-surge event to rework and form physical structures in sand layers of the prodelta area. Formation of the thickest sand layers and their rapid burial due to the high sedimentation rates in the prodelta both inhibit bioturbation and enhance preservation of the physical structures. Even more important, the low salinity and more extensive ice formation in the prodelta (Figs. 70-2 and 70-11) appear to restrict faunal populations and consequent bioturbation of the physical structures. The com- plete bioturbation of physical structures at similar water depths but in normal salinity on the northern side of Norton Sound appears to confirm this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hood, D. W. (Donald W
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