Deception Pass connects the Straits of Juan de Fuca and Skagit Bay, and during the change in tides, the difference in response rate between the Bay and the Strait cause a visible current through the pass, sometimes resulting in standing waves and whirlpools. We came through just as the tide was turning so we were able to see the current, but not the large standing waves.
From Anacortes (just north of Deception Pass), we took the ferry to the San Juan Islands. The San Juan Islands consist of an archipelago that represents a submerged mountain range that connects Vancouver Island with the mainland. The Islands are largely composed of Paleozoic aged sedimentary rocks which have been folded into a broad east/southeast plunging syncline. The sedimentary rocks have been intruded and metamorphosed by Mesozoic aged igneous activity. During the Pleistocene, the mountains were heavily glaciated so many of the straits and channels have fjord like characteristics.
Within the Paleozoic aged sedimentary rocks are lenses of Devonian aged limestone. These limestone deposits are accessible on San Juan Island near Roche Harbor and at Lime Kiln Point on San Juan Island. In fact Roche Harbor was a company town dedicated to the production of Lime, and much of the historic town infrastructure has been retained by the resort that now owns the town.
Lime was produced from the Limestone at Roche Harbor and (what is now) Lime Kiln State Park beginning in 18608. Some of the old lime furnaces are still standing, including this one at Lime Kiln State Park (built in 1918).
|1918 Vintage Lime Furnace|
|Limestone chunks into a hole at top|
|Wood added on the side|
|Finished Lime out here|