I'm searching for information regarding a cave in South Dakota. I discovered the cave North of Jewel Cave in Hell's Canyon in the mid to late 1970s. It was (initially) named 'Porcupine Cave'.
I spent four different nights exploring the cave with friends, and then went to Jewel Cave and talked to a 'Ranger' or Naturalist about my discovery. He showed up the next night with all the appropriate gear we needed to safely explore the cave a couple of more hours.
I did receive one map of the cave from a member(s) of the NSS a few months after the discovery. I was told the cave is the largest discovered (to that date) at that altitude (highest altitude?) in Hell's Canyon. At the time, just over 300 ft of the cave had been surveyed and mapped. I've not heard anything about this cave since. I would sure like to know more about it!
Any help would be appreciated!
PEACE!