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If I had a photo I'd post it... One cave pearl I've seen was black. Very, very rare and not all that easy to get to in terms of traversing the cave to see it. Other pearls I've seen are similar to what you are looking at (below), which are gorgeous pictures by the way... best I've seen of these type.Pearls are a concentric concretion found in shallow cave pools. They can be spherical, as in the lower photo, or cylindrical, elliptical, and even cubical. They range in size from barely larger than a sand grain up to golf-ball sized. In the tropics, large beds of them may be found.
Cave pearls form when water dripping into the pool loses carbon dioxide and precipitates calcite. This precipitate usually forms around a nucleus of sand, bones, or fragments of soda straws or rafts. The typical roundness is due to the uniform growth of the pearl, not to any sort of rotation due to dripping. A sphere allows the greatest amound of deposition for the smallest surface area and is thus most likely, even if the nucleus is highly irregular. The dripping causes vibrations in the pool which may prevent the pearls from cementing (with calcite) to the pool floor, though many pearls are found cemented in. Sometimes excess precipitate will form cups or nests around the pearls, like in the photo on the bottom.
WHOO-HOO!!!MACaver said:Next week we start on Vertical... can you say whoo-hoo! ?? I thought you could.
Woah there Turbo.Nalia said:MACaver,
Verticle caving sounds fascinating. EVERYTHING you have described in this thread sounds fascinating actually . Please excuse my ignorance but when descending down the cave I am presuming that you need continuous rope to make it all the way down, meaning no knots in it to join two together . How far is the farthest drop that you have done and do you have pictures? What about your other cave enthusiasts? What is the farthest that they have gone? Do you have any big cave drops coming up? How long to the ropes last before they need to be replaced? Are they only made of nylon and why? And what about air quality deep in the caves? Is there a funky smell?
I know there are a lot of questions, but inquiring minds want to know
Lisa
Usually we have a length of rope suited to the depth of the drop. However ropes have a nasty habit of accumulating weight the longer they get. In Utah with it's (oft steep) mountain terrian that is quite a bother...considering one is also carrying anywhere from 15-25 lbs of personal caving gear to boot. We will usually try to have one single length as long as it's practical to carry. One fella has a 400' single length and it's a good 45 lbs. I, myself, own a 300'er and it gets kinda hefty after about a mile or two hiking uphill with several more miles to go. We do tie ropes together when we have to. One such cave no-one knew the depth of a virgin drop and rope was guessimated and used and it was not enough so additonal rope was brought in for the next trip...that wasn't enough, til finally they reached the bottom. This was the beautiful 300' freehanging Fantasy Well in Neilsens Cave (-880').Nalia said:I am presuming that you need continuous rope to make it all the way down, meaning no knots in it to join two together
My deepest to date is -400' (thereabouts) on a single drop. I average a lot less than that. I do have pics but not immediate. My roomie/caving-bud and I went to do this deep shaft (my 400'er) and he managed to reach the bottom which is about -710'. We dropped Calyume light sticks down the shaft the night before and thus he brought them back up... so he made it alright.Nalia said:How far is the farthest drop that you have done and do you have pictures? What about your other cave enthusiasts? What is the farthest that they have gone?
I want to arrange a trip to drop down the same shaft (again) with the intent to reach the bottom myself. Logistics right now are the only thing inhibiting this particular goal. Perhaps in the spring.Nalia said:Do you have any big cave drops coming up?
As with anything, ropes will have a long life provided that the owner takes care of it. My present ropes have been around for a while. They are due for a replacement but they should have a good life for another two or three years.Nalia said:How long to the ropes last before they need to be replaced? Are they only made of nylon and why?
Rope is one of the most important pieces of equipment. Therefore it needs to exhibit a number of very different characteristics. It is the combination of core and sheath designs that creates the balance of dynamic load absorbing ability, abrasion resistance and the overall strength necessary to give each climbing rope its desired performance characteristics. Caving/climbing ropes are built using kernmantle construction. The basic strength of a climbing rope is in its core (kern). The combination of mechanical and physical elongation of the nylon fibers allows a climbing rope the ability to absorb the energy of a falling climber. The core of a dynamic rope consists of individual core strands twisted clockwise and counterclockwise. These opposing twists help to minimize excessive spinning when lowering, abseiling or ascending.
A climbing rope's sheath (mantle) can be made in different thicknesses and braid patterns to achieve desired durability and handling characteristics. A thicker sheath will give greater durability and increased abrasion resistance. A thinner sheath can be used when a lighter weight rope is desired. A tightly braided sheath will slip very little on the core but adds stiffness to the overall flex of the climbing rope. A loosely braided sheath creates a rope that is more flexible and easier to handle, but allows more sheath slippage.
A rope must be able to absorb the energy of repeated falls and withstand fierce abrasion
Most of the funky smells comes from Caver sweat and farts.Nalia said:And what about air quality deep in the caves? Is there a funky smell?
Weird, man. I would have never guessed that such a thing could exist. Ralph, you are a fascinating fellow. I'm so glad I started this thread. I'm even happier you keep it rockin'.Cave Formation of the Week: Cave Pearls
I tell my beginner students to anticipate spending roughly anywhere between $200 to $250 and count on the stuff lasting for YEARS afterwards if they take care of it, this is including helmet, harness and hardware (carabiners, decenders and ascenders) and soft ware (webbing and cordage). Figure another $12 to $70 bucks for the headlamp.Tgace said:Ive done sport climbing for a few years...done the rappelling, ascending, protection/ropework thing, but you cavers are a whole other level.....whats your estimate on gear outlay??