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==Shorelines and barrier islands==

==Shorelines and barrier islands==

Shoreface sands are deposited along shorelines, and they generally form extensive, high-quality reservoir systems ([[Figure 191]]). Wave action and occasional storms act to deposit sand along the shoreface. The lower shoreface lies below fair-weather wave base but can be affected by storms; the sands tend to be siltier and more poorly sorted by comparison to the upper shoreface, where the sands have been subjected to wave winnowing. A shoreface deposit separated by a lagoon from the land is known as a barrier island.

[[File:M91FG191.JPG|thumb|300px|{{figure number|1}}The photograph shows a shoreface profile on St. Cyrus Beach, Scotland. The beach is just over a hundred meters wide. Reservoir properties are influenced by the degree of wave reworking up the shoreface profile. Lower figure from McCubbin (1982). Reprinted with permission from the AAPG.]]

[[File:M91FG191.JPG|thumb|300px|{{figure number|1}}The photograph shows a shoreface profile on St. Cyrus Beach, Scotland. The beach is just over a hundred meters wide. Reservoir properties are influenced by the degree of wave reworking up the shoreface profile. Lower figure from McCubbin (1982). Reprinted with permission from the AAPG.]]

Shoreface sands are deposited along shorelines, and they generally form extensive, high-quality reservoir systems ([[:File:M91FG191.JPG|Figure 1]]). Wave action and occasional storms act to deposit sand along the shoreface. The lower shoreface lies below fair-weather wave base but can be affected by storms; the sands tend to be siltier and more poorly sorted by comparison to the upper shoreface, where the sands have been subjected to wave winnowing. A shoreface deposit separated by a lagoon from the land is known as a barrier island.

==Shoreface sands form layer-cake geometries==

==Shoreface sands form layer-cake geometries==