Page 41 - Maldonado_Stanley_1976

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FIGURE 21.-Bottom photographs collected in shallow environments in the Strait of Sicily: A,
Patches of sand and grave1 showing coarse, calcareous sediment, including calcareous a1gae, a1ga1
balls and shells; station 151-59, 88 m, a shallow bank in the Strait Narrows. B, Calcareous sand
and grave!, including shell and a1gae, on a bank south of Pantelleria Is1and; station 151-56,
119 m. c, Shelly sand on a shallow bank north of Cape Bon in the Strait Narrows; station
151-60, 106m. D, Crinoids on a coarse calcareous sand and grave1, including calcareous algae and
shell (example of maerl) on a bank northwest of Marettimo Is1and, north of the Strait Nar-
rows; station 151-62, 133 m. (Photos courtesy of the Woods Hole Oceanographic Institution.)
One photograph (Figure 23A) shows the dose Structures Observed in X-Radiographs
relation between sedimentation and bioturbation: and Split Cores
the fecal pellet-covered sea floor in the Malta
Trough is partially veneered by a thin, smooth Core radiography is a valuable technique for the
layer of fine-grained sediment. The lack of tracks definition of the different Strait of Sicily sediment
on this smooth coating suggests that the mud layer types which in earlier sections were identified on
has been recently deposited, although the transport the basis. of texture and composition. X-radiographs
process involved (gravity assisted bottom or tur- are of particular importance for the recognition of
bidity current?) is unknown. the different mud types, and this technique also