A generally calm geyser in Yellowstone National Park erupted last month and spat up water up to 30 feet in the air. Then, park staff discovered a multitude of trash around his vent, including a Hamm beer can, a vintage lollipop, a shoe heel and dozens of pieces.

The Conservatives considered placing the objects in the park's archives as a reminder: Please do not use the springs as trash. The park released a photo of "strange" objects after last month's geyser eruption, called Ear Spring.

"Foreign objects can damage hot springs and geysers," said the park. "The next time Ear Spring will burst, we hope it's just natural rocks and water."

The lollipop goes back to the 1930s, according to Live Science, which noted a block of cinderblock, a broken bottle, old signs, cigarette butts and an eight-inch straw among the items.

"Some are clearly historic," said the park in his article. So was the eruption of September 15.

According to the US Geological Survey, Old Ear had not seen any eruptions of this size since 1957, although smaller explosions occurred in 2004.

After the eruption, a change in hydrothermal activity occurred in the area around Old Ear, called Geyser Hill, said the USGS, which is located on the other side Firehole River side, Old Faithful.

"An area about 8 feet in diameter surrounding the floor" breathes "- it increases and decreases about 6 inches every 10 minutes," said the USGS in the update of 19 September.

"Several other thermal features are more active than usual, including the geysering and boiling of the Doublet Pool and North Goggles Geyser."

Follow Josh Hafner on Twitter: @joshhafner

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