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Originally posted by mystiq
airshafts for the governments underground bases?
I carefully looked for a good place to dig an archaeological or geological test it. I didn’t find any good archaeology sites (pit houses, etc) that were in the immediate vicinity (within the bear-safe radius distance) so I ended up digging a deep, narrow geology hole. The weather was very nice this day – clear and sunny all morning – and while I was digging there was just enough breeze to keep MOST of the flies away. I dug down about 90 cm (as deep as I could reach with both arms and shoulders in the hole) and found the Kuril Lake tephra plus the finer black tephra below it. I carefully described the stratigraphy in my hole and headed back over to the others. (See picture below)
My first completely solo excavation! I single-handedly dug the entire excavation, described it and drew up the section. I have become an accomplished novice geologist! Near the bottom of the pit, which is about 90 cm deep, you can see the distinctive Kuril Lake tephra – lighter brown in color and thick, with a black tephra layer just below it.
"This confirms that this pit is essentially a vertical shaft cut through the lava flows on the flank of the volcano. Such pits form on similar volcanoes in Hawaii and are called 'pit craters.' They generally do not connect to long open caverns but are the result of deep underground collapse. From the shadow of the rim cast onto the wall of the pit we can calculate that the pit is at least 78 meters (255 feet) deep. The pit is 150 by 157 meters (492 by 515 feet) across."