This video is about the Permian-Triassic mass extinction.
From National Geographic:
Indian Fossil Bed Being Ground Into Cement
Paroma Basu in New Delhi, India
for National Geographic News
February 6, 2008
A fossil-rich region of India’s war-torn state of Kashmir could be blasted out of existence by mining operations, according to eyewitness accounts by geologists.
But the fossils lie inside rich tracts of limestone—a key ingredient in cement manufacturing.
Local authorities declared the Guryul site a protected area last year and claim that mining activities have ceased.
But there are still quarry owners who supply stone chips to small-scale cement factories in nearby towns, said Ghulam Mohamad Bhat, a sediment geologist at Kashmir’s University of Jammu.
Bigger pieces of exploded rock are used in road and housing construction.
Quarry operators earn about 600 rupees (U.S. $15) per truckload of stones, according to a recent report in the Telegraph, a leading daily newspaper of eastern India.
“Underhanded mining has gone on for years and is still going on,” Bhat said. “Sadly, the fossil section at Guryul has been entirely put to sale.” …
Most of these creatures perished in a massive extinction event that took place between the Permian and Triassic periods about 251 million years ago.
While the event is also captured in stone in other parts of the world, including Iran and China, it is best preserved in the Kashmir section, Bhat said.
“Studying these fossils can tell us how life evolved afresh after the extinction,” Bhat said.