I lost the slide of this image , but fortunately I have a large negative from the place that made my prints years ago. I scanned the slide then converted it to B&W because it's hard to correct the color version. This was on Kodachrome 64 slide film.
This was shot from a coastal bluff just before sunset. Nice smooth waves were rolling in this evening. It was nearing sunset and I was toying with long exposures in an attempt to figure out how to do these long exposures in a more routine and predictable way. (there isn't)
Kodachrome was hard to shoot in this way. I probably started the exposure one or two minutes after the sun went down.
The sun is setting as the exposure is happening. The correct exposure when the shot started was one minute, but when the exposure ended, 4 minutes later the exposure might have been 16 to 30 minutes......... so what you do ........is
guess. With the first exposure completed, the second might be 1, 2 or even 4 hours long....... so you get one shot.
I discovered with experimentation that 2 to 4 minutes let the ocean go smooth and still let the colors of the sunset reflect on the sandstone and basalt. More than that it all went an ugly grey.
This exposure was between 2 and 4 minutes long and that's why the ocean looks like fog instead of waves. Long exposures of moving things like waves or cars makes them blur.