In 1836, two Massachusetts residents found a series of three-toed tracks embedded in sandstone in the Connecticut ... of dinosaur fossils made in the United States. (Although they are not bodily ...

Finding petroglyphs (rock carvings) and pictographs (rock paintings) in the United States has ... they are found in more than half of our country's states and territories—meaning you don ...

The remains, found in the approximately 190-million-year-old rock of southern Utah's Navajo Sandstone ... yet found from the western United States. Paleontologists have been finding fragments ...

A possible explanation for what created these enigmatic sandstones is the immense pressure ... unconformities can be seen today across the United States, most famously at the Grand Canyon, where ...