Subway Cave is a lava tube cave near Lassen Volcanic National Park, in the Lassen National Forest. Lava tubes form when lava flowing out of a volcanic eruption cools and forms an upper crust, but lava underneath is still warm and fluid and eventually drains out, forming a tube. When parts of the roof collapse, entrances are created. Subway Cave has two roof collapses about .3 miles apart, which allows visitors to take a short hike from one to the other. The visitor can then return to the start through the cave or take a surface trail back.
Northeastern California has at least 300 such caves, but few are as high or as easily accessible as this one, being right off a main road. The cave entrances have cement stairs for easy access. The actual lava tube continues further along than where the stairways are located, but these parts of the cave may be considered less stable and therefore more hazardous. We've hiked into the extended parts of the cave to explore it more and found that the tunnel split. Very fascinating, these features, especially when you try to imagine what the flow of hot lava would look like when the tube was forming.
Anyone wishing a print of this photo will need to keep its dimensions in mind when ordering. The dimensions that our online photo processing offers that applies to this image is 2x1 (or 8.5x17 legal size paper).
Remember, it's not just a picture, it's a story!
you are invited to follow my blog
ReplyDelete