- MOLLUSCS: THE SURVIVAL GAME (shapeoflife.org)
Their basic body plan includes a foot for mobility; a mantle that secretes a shell and a radula for eating. Molluscs today show many variations on this original body plan. An abalone escapes a sea star predator using its foot; and a moon snail hunts a cockle using its foot as a weapon. The radula has even evolved in an astonishing variety of ways to serve as a tool for feeding. The ancient nautilus was the first mollusc to leave the sea floor. Their ancestors evolved a way to swim using jet propulsion and evolved a way to maintain buoyancy. The evolution of speedy fishes drove the next step in the survival game: speed and loss of the shell, as seen in squid. Octopuses returned to live on the bottom and evolved intelligence and an ability to instantly camouflage itself in order to survive.
- Deception Pass (gravelbeach.blogspot.com)
Much of Puget Sound is nothing but Pleistocene - with Vashon glacial deposits on the surface and older glacial and interglacial sediments peaking out from the lower portions of some of the bluffs. But at Rocky Point, on the west side of Whidbey Island, and in Skagit Bay, the Mesozoic re-emerges from the basement to form rocky islands and headlands.
upstream on the Skagit River
- Skagit Bay (Wikipedia)
Skagit Bay is a bay and strait located in the U.S. state of Washington. It is part of the Whidbey Island Basin of Puget Sound. The Skagit River empties into Skagit Bay. To the south, Skagit Bay connects with the rest of Puget Sound via Saratoga Passage and Possession Sound. The boundary between Saratoga Passage and Skagit Bay is between Polnell Point on Whidbey Island and Rocky Point on Camano Island. To the northwest, Skagit Bay connects to the Strait of Juan de Fuca via the narrow strait of Deception Pass. A third waterway, the Swinomish Channel, connects Skagit Bay with Padilla Bay to the north.
