Underground cavities beneath Ledges Sink, Fl
Logs that fall through the overlying bedrock litter the cavern floor....
Location: USA

Underground cavities beneath Ledges Sink, Fl
Roots break through the overlying bedrock of the cavern....
Location: USA

Underground cavities beneath Ledges Sink, Fl
Flow conditions near Ledges Sink....
Location: USA

Underground cavities beneath Ledges Sink, Fl
Ledges Sink....
Location: USA

Underground cavities beneath Ledges Sink, Fl
Wil Causseaux climbs through the opening of Ledges Sink to the underlying caverns....
Location: USA

Underground cavities beneath Ledges Sink, Fl
Water flow in the underlying cavity associated with Ledges Sink....
Location: USA

Neil Armstrong on Mule
Apollo 11 Commander Neil Armstrong piloting a mule in the Grand Canyon, Ariz., March 1964....
Location: Grand Canyon, AZ, USA

Crater Creation
Blasting craters for a new section of the Cinder Lakes outside Flagstaff, Ariz.(July 1968). USGS Astrogeology constructed a mockup of a section of the moon's Sea of Tranquillity in a cinder field to aid with training and time-and-motion studies....
Location: Flagstaff, AZ, USA

Abraham Gottob Werner
Abraham Gottob Werner(1750-1817), along with James Hutton, is considered one of the founders of Geology. This German geologist's work was mostly concerned with the formation of the Earth and the formation of rocks. He focused on the color, luster, streak, and hardness of rocks and minerals, rather t...
Location: USA

James Hutton
James Hutton(1726-1797) is considered to be the founder of modern Geology. His studies of the rock formations of his native Scotland helped him to formulate his most famous work, "Theory of the Earth". This work was interpreted and used by many as the basis for geological theory. Hutton made many ob...
Location: USA

Amos Eaton
Amos Eaton(1776-1842) was a geologist whose research area was the geological profile of the New England region of the United States. He was one of the most influential American Geologists. He is considered by some to be the father of American Geology. He was an advocate of field work and took his st...
Location: USA

William Smith
William Smith(1769-1839) is Considered by many people to be the "Father of English Geology". He began his work as an engineer for a company digging canals. While he was working he made some observations about the way that the Earth was arranged in layers around him. This lead to him creating a profi...
Location: USA

James Dwight Dana
This portrait of James Dwight Dana(1813-1895) was done in the 1920s by Abner Lowe. Yale educated, Dana made significant contributions to geology, mineralogy, and zoology. In 1838, Dana accompanied the United States Exploring Expedition as a Zoologist and produced two important monographs, one on cor...
Location: USA

Grover
Grover was built in just four months in 1971 by the USGS Astrogeology Research Program (called the Branch of Astrogeology at the time) and used to training Apollo 15-17 astronauts at the Cinder Lakes training ground near Flagstaff, in California’s Mojave Desert, and in the Rio Grande gorge near Tao...
Location: USA

Marl Limestone Outcropping
A marl limestone outcropping amid ferns on the Fern Forest floor....
Location: FL, USA