Which states in the United States have the most dinosaur fossil sites?

Although many states have dinosaur sites, so far the states that seem to be the most prolific producers of fossils are Colorado, Utah, Wyoming, and Montana.

Have dinosaur fossils been found in any U.S. metropolitan areas?

Dinosaur fossils have been found in the Denver, Colorado, metropolitan area that were exposed during recent construction projects. This urban area lies on top of a treasure trove of fossils, both dinosaur and others. Evidence suggests that millions of years ago this area was part of a tropical rain forest. During excavation for Denver International Airport in 1989, bone and plant fossils were found. There are other examples, too.

Recently, the remains of four Triceratops were discovered during the construction of fairways at The Heritage at Westmoor Golf Course; and at a subdivision south of the golf course bones from five dinosaurs, a crocodile, and a mammal were found.

What heavily armored dinosaur fossils were found in Utah?

Scientists recently discovered two new species of heavily armored dinosaurs (or ankylosaurids) in Utah about 100 miles southwest of Salt Lake City. The species were both about 30 feet (9 meters) in length. One is an ankylosaur, or club-tailed armored dinosaur, and is the oldest ever found. The other fossil is that of a nodosaur, a clubless armored dinosaur, the largest on record. Most ankylosaurids were from Asia; these animals were thought to have crossed over a land bridge to North America about 100 million years ago.

Where was the worlds oldest and most primitive duck-billed dinosaur found?

The worlds oldest and most primitive duck-billed dinosaur, Protohadros byrdi, was discovered in a road cut near Flower Mound in northcentral Texas. When this dinosaur died almost 95.5 million years ago, the middle of North America had a shallow seaway, and northern Texas was a wooded marsh. Scientists are currently trying to determine if this means that the birthplace of hadrosaurs was North America instead of Asia, as previously thought.

Were east coast dinosaur tracks found by an amateur paleontologist?

Yes, a large number of dinosaur and flying reptile tracks from around 105 to 115 million years ago were found in local stream beds by Ray Stanford, an amateur paleontologist living in the area around Washington, D.C. Collected over a period of four years, the rocks contain nearly 900 Middle Cretaceous dinosaur (and other vertebrate) tracks, representing at least two dozen species of dinosaur. Stanfords finds have astonished professional paleontologists, who had thought that tracks like these didnt exist in this area. He is also the discoverer of a new species of dinosaur.

Besides the unexpected discovery of these tracks on the east coast, there are up to a dozen species of dinosaurs represented by the footprints, including several species that were previously unknown. There appears to be several different species of herbivorous dinosaurs, and perhaps a young ankylosaur.

Where were the fossilized remains of a Jurassic period tree found?

The fossilized remains of a Jurassic period tree were discovered in the Garden Park Fossil Park near Canon City, Colorado, by a teenager on a school outing. While scraping in the dirt, the teenager found what he thought was a bone; a tour guide realized the fossils true identity. The fossilized tree, believed to be a type of conifer, was carefully dug out. This is the first Jurassic period (about 150 million years old) tree from Garden Park, and perhaps the entire Front Range of Colorado.

Believe it or not, it was a toy much like this one that was used when three-year-old David Shiftier discovered the oldest dino egg fossil ever uncovered in New Mexico (iStock).

What discovery in Pennsylvania helps us understand the Triassic period extinction?

Three skulls from animals belonging to the genus Hypsognathus were uncovered in Pennsylvania. Two were found in a mudstone deposit at a construction site in Exeter Township, and a third was found in the town of Pennsburg. These sites are located in the area between Allentown and Pottstown, Pennsylvania, and were part of the Newark rift basin millions of years ago, formed as the supercontinent Pangea began to break apart. The remains of these animals have been dated to just 500,000 years before the extinction at the end of the Triassic period, approximately 200 million years ago. They present paleontologists with a rare fossil record of animals that lived during this time.

The Hypsognathus reptiles were l-foot- (0.3-meter-) long horned herbivores, somewhat analogous to modern-day groundhogs. They lived during the Triassic period among animals such as amphibians and reptiles, including the then-relatively new and small dinosaurs. Scientists believe something happened about 200 million years ago: a mass extinction that changed the course of evolution that allowed the dinosaurs to dominate and grow into larger and more diverse forms. Evidence for this mass extinction has been very rare, mainly due to a lack of skeletal remains from this time period. The discovery of the Hypsognathus skulls shows these animals lived right up to the boundary between the Triassic and Jurassic, thus lending support to the mass extinction theory.

What are some findings from the Utah Cretaceous period fossils?

The more than 6,000 fossils include approximately 80 different types of animals found in Emery County, Utah. The specimens at this dig are thought to be about 100 million years old and are the first fossils found in this area from a span of time ranging from about 145 to 65 million years ago (the end of the Cretaceous period).

These fossils will help shed some light on the great changes that occurred during this time period.

There have been some very interesting findings associated with these Cretaceous fossils. For example, the early dominant dinosaurs in North America during this period appear to have been the large, long-necked sauropods. But their huge numbers, combined with their huge appetites, caused them to essentially clear-cut the existing forests. The new flowering plants then moved in and took over, being fastgrowing and capable of rapid colonization. These early flowering plants grew low to the ground as bushes and shrubs; the long-necked sauropods faded from the scene, apparently having eaten themselves out of a food supply. To take advantage of these low-lying plants, new forms of dinosaurs emerged and became dominant. These included such animals as the duckbills and the short, squat, horned dinosaurs.

Another finding concerns the ancestry of these North American dinosaurs: nearly all of the dinosaurs found at this site were first discovered in Asia. It is now thought that the North American Cretaceous period dinosaurs were the descendants of dinosaurs that first arose in Asia. This is the first evidence showing that these dinosaurs came from Asia, and most of these dinosaurs were present in North America by about 100 million years ago.

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