There are World War II relics in Europe, sets of human remains in Las Vegas, and an entire village in Spain, because of the drying up of bodies of water.
Dinosaur tracks in Texas were found as water levels fell.
A spokeswoman for the Texas Parks and Wildlife Department said that Dinosaur Valley State Park exposed dinosaur tracks that were previously hidden under the Paluxy River. The tracks are from Acrocanthosaurus, a type of dinosaur with three toes and claws.
As an adult, the dinosaur would have weighed around seven tons. Researchers say that they would have left their footprints in the sand.
The river dried up completely in most locations, allowing for more tracks to be found in the park. Under normal river conditions, these newer tracks are buried and not seen.
There is a chance that the tracks will be buried by rain this week. Even if for a short time, the finding excited researchers and the public.
The tracks are being buried to protect them from weathering and erosion.
The Sauroposeidon proteles is a sauropod, a long-necked, small-headed dinosaur. As an adult, this species would have weighed 44 tons.
Louis Jacobs is a professor at Southern Methodist University. He said these tracks join trackways that are already known, and they add up to about 150 dinosaur steps.
He said that the footprints are amazing because they are deep. The toenails are visible. There are more than one type and a lot of them.
There might be more undiscovered by Mr. Jacobs. The river will expose more as it erodes.
There are dinosaur tracks on display in New York City.
In British Columbia and South America, similar tracks have been found.
Researchers have been learning about dinosaur behavior from the river and park. The tracks are cracked in the winter by freezing rocks.
The Glen Rose Formation is mostly limestone and was deposited about 105 to 120 million years ago.
There are a lot of good fossil occurrences in Texas.
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