Workers are uncovering fossils from the last Ice Age as they expand Los Angeles’ Metro subway lines, according to USA Today.
USA Today reported Monday that recent discoveries include the fossilized remains of ancient animals like giant sloths, extinct camels and mastodons.
Los Angeles’ Metropolitan Transit Authority (MTA) has reportedly added paleontologists to its staff to analyze and protect any bones it encounters.
“Fossils are a treasure for the public, and we’ve worked it into our contracts so that we can work closely with paleontologists,” MTA spokesman Dave Sotero said.
Some Twitter users on Monday voiced wonder at the finds, which reportedly began appearing in 2016.
Francisco Palacios, an environmental monitor overseeing MTA’s work, told USA Today that most recent find occurred last last November.
Workers reportedly dug out what was ultimately identified as a mammoth skull based on patterns in its intact tusks.
USA Today reported that many of the fossils emerged from soil dating back to the last Ice Age, which unfolded more than 10,000 years ago.
Most of the remains uncovered were found at two locations about six months apart, it reported, along Crenshaw Boulevard in the south and Wilshire Boulevard in the north.
Ashley Leger, a paleontologist who is leading the operation, said many of the discoveries came in rapid succession.
Fossils which appeared include bones from ancient bisons, an extinct camel species, giant sloths, mammoths and mastodons, according to USA Today.