The first time I tried geoduck was via a gift from shellfish business I did some geology work for. I have since dug for them a few times during very low tides. They are a fun prize to pull up out of the sand. One big goeduck is more than enough for a meal. But those big geoducks take many years to grow. As their value has increased management of the resource has become more important.
Tuesday, December 29, 2020
Saturday, December 12, 2020
I roughed in the route of a 1824 Hudson Bay Company expedition from Fort George, the former Fort Astoria trading post, to what was later to become Fort Langley via Journal of John Work, November and December, 1824 via T.C. Elliot, 1912.
Part of the scheme was to find the location of a trading center fort on the Fraser River that could receive export goods (furs) from the interior of western North American. Hudson Bay Company (HBC) was already concerned that the lower Columbia would end up in American possession. In part because Fort George was originally an American establishment. In addition, at that time navigation from the sea to the lower Fraser was far superior to the harrowing crossing of the entrance to the Columbia. However, while the Fraser River was a better sea access point, the Fraser River was not a good river transit route. While a fort ultimately was built, Fort Langley, the Fraser proved to be an impossible navigation route from the interior.
The journal is a window to a different time, and for that matter a different place. I have been fascinated by the diversity of the people and interactions that took place in the brief period from 1790 to 1825. The assembled team for the venture clearly had a pretty good idea of the route they should take. The team included several Hawaiians (Islanders) as well as an Iroquois hunter and his slave.
Note the time of year they traveled, November-December. While it does rain in November and December in western Washington, the outer coast and the southwest part of the state gets 'heavy rain', a term that Mr. Work used in his journal of his venture (correct spelling of his name was Wark). This was a hardy group. I contemplate how I would have performed portaging across wet ground and along shorelines, rowing for many miles, and camping in the rain, the heavy rain.
Sunday, December 6, 2020
On the uplands of Crane Island, the bedrock is generally massive metamorphosed sandstone of the Constitution Formation.
Chert is primarily composed of ribbon chert, alternating layers of silica rich
1 to 2 inches thick with thin layers of shale. The chert is derived from the
accumulation of silica diatoms that accumulated on the ocean floor. The shale
was derived from fine dust and silt that also reached the ocean floor. The
layering developed after deposition when the ooze of silica rich and silty
sediment was compacted. The age of the Orcas Chert is between 180 and 280
million years old. The Orcas Chert is part of terrain consisting of the related
Deadman Bay Volcanics, which are ocean floor pillow basalts that are somewhat
older than the Orcas Chert and likely formed the basement that the silica rich
sediment that formed the chert unit was deposited on. The original depositional
setting was an ocean floor area far from
The Constitution Formation was also originally an ocean floor assemblage; however, this unit is on the order of 130 million years old. The Constitution Formation consists predominantly of metamorphosed fine sandstone derived from a volcanic arc. There is some chert and basalt in the unit as well. This formation was also accreted to the edge of North America. A lack of older aged sediment, North America sediment, suggests the sediment may have been derived from an ocean island arc.
The Rosario Thrust Fault and the juxtaposition of the Orcas Chert and Constitution Formation took place after accretion -- note that the younger Constitution is thrust over the older Orcas Chert.
The map pattern shows that Crane Island is klippen of Constitution Formation on the underlying Orcas Chert. Parts of the Constitution Formation have been stripped away leaving the Constitution Formation as an 'island' on the Orcas Chert and as well as the rock formation that makes up most of Crane Island.