https://phys.org/news/2018-07-yellowstone-geyser-trash-treasure.html

"There's a bottled water lid!" exclaimed Megan Udeck, a junior from Missoula who is majoring in biotechnology at MSU.

That cued Russell Bair, one of two park rangers accompanying the crew, to extend his trash-picker and pluck the small cap from the mineral-encrusted rivulet. Udeck and two other students waited with rubber-gloved hands to receive the quarry.