Blanchard Mountain was once covered in a massive sandstone deposit called the Chuckanut Formation. Over time, this sandstone unit grew to be more than 10,000 feet thick, trapping many fossils of ancient plant and animal species.

geology of

Cathode-ray tube (Wikipedia) A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms on an oscilloscope, a frame of video on an analog television set (TV), digital raster graphics on a computer monitor, or other phenomena like radar targets. A CRT in a TV is commonly called a picture tube. CRTs have also been used as memory devices, in which case the screen is not intended to be visible to an observer. The term cathode ray was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons.

Oyster Dome (wa100.dnr.wa.gov) Take an invigorating hike up Blanchard Mountain, located south of Lake Samish, to the geologic treasure known as Oyster Dome—a rounded, rocky promontory with spectacular views of the San Juan Islands and the Olympic Mountains. Oyster dome is located in the 4,500-acre Blanchard State Forest, the only place in Washington where the Cascade Mountains meet the Salish Sea.