Winter operations, 1970-1971 / John C. Ayers, Norbert W. O'Hara, William L. Yocum.

structure off the Cook Plant site on 26 February 1971 when the basic shore ice,
the second lagoon, and Ridge D were present without the complication of brash
ice fields to lakeward. From the foreground the following features can be observed: the beach, Ridge A, Ridge B, the inner lagoon, Ridge C, the second
lagoon, and Ridge D. The heavily sand-laden conditions of the three inner ridges
are clearly evident.
Details of the Shore Ice Structure at Maximum Development
The following pictures were taken by Dr. O'Hara on 26 February 1971 off
the Cook Plant site during an observation and study walk from the beach out to
the lakeward face of Ridge D.
Figure 15(80) is a view northward along Ridge B, Ridge A lies in the right
middle distance; Ridge C lies in the left three-quarters distance. All three
ridges are heavily sand-laden as a result of sand concentration, by solar heat
on the sand particles and ice evaporation.
Figure 16(85) is of the lakeward face of Ridge C with ice of the outer
lagoon at the right. The nature of the lagoon ice shows its floe ice origin.
Figure 17(88) shows a natural cross section of Ridge C where it had been
breached by waves. The surface of the ridge is covered with sand. Layers of
spray ice show above the shovel handle and a layer of spray ice with iceballs
can be observed behind the shovel handle.
In Figure 18(89) a saw cut has been made through the spray ice layers.
The layers both taper toward the beach and tilt downward toward the beach. Limited amounts of sand are present in the thin layers.
Figure 19(90) is a saw cut through the spray ice and iceball stratum.
In Figure 20(91) is shown an anticlinal pressure feature in the ice of the
second lagoon about 10 meters west of Ridge C. Four large sandy pieces of pancake ice show in the background.
Figure 21(92) is a view from the shoreward edge of Ridge D back across the

9