Rocky Cove, Cook Inlet

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Rocky Cove is an embayment about 1 mile (1.6 km) wide on the southwest shore of Cook Inlet, north of Kamishak Bay, Alaska. The name was first published in 1903 by G.C. Martin of the U.S. Geological Survey. Step Mountain forms the headland called Tignagvik Point on the south side of Rocky Cove. The cove entrance is obstructed by reefs that extend about 2 miles (3.2 km) offshore and are exposed at low tides.

Headlands like Tignagvik Point are generally eroding features and embayments like Rocky Cove are where eroded sediments accumulate. Reefs and intertidal platforms are also erosional features that indicate an actively retreating coast. Coastal recession is generally not uniform because of variations in rock resistance to erosion. The surging motion of waves erode the sedimentary rocks forming the platforms and reefs in Rocky Cove. The platform corrugations are formed by different erosion rates of vertically tilted layers of harder and softer sediments.

Active sediment transport by waves and currents along the base of the sea cliffs and in shallow subtidal rock platforms may prevent the recruitment and colonization of benthic marine plants and animals. Some marine plants have adapted to this environment and may colonize the rock platforms and reefs that are only exposed during the lowest tides. Read more here and here. Download the latest version of the CoastView app and explore more of Rocky Cove here: