The U.S. Geological Survey in camp at Red Buttes.
Figures are 1. F.V. Hayden, U.S. Geologist in Charge, 2. James Stevenson, 3. H.W. Elliot, 4. S.R. Gifford, guest, 5. J.H. Beaman, 6. C.S. Turnbull, 7 and 8. cooks, 9. Cyrus Thomas, 10. H.D. Schmidt, 11. C.P. Carrington, 12. L.A. Bartlett, 13. Raphael, hunter, 14. A.L. Ford, 15. W.H. Jackson. Natrona County, Wyoming., 8/24/1870

Jackson, William Henry, 1843-1942, Photographer.  Series: Hayden Survey, William H. Jackson, Photographs, 1869 - 1878Record Group 57: Records of the U.S. Geological Survey, 1839 - 2008

Find more of William Jackson’s photos from the Hayden Survey in the National Archives Catalog

Grand Prismatic Spring, Yellowstone National Park.

Looking almost alien, and definitely cool, the image below is of a geothermal pool located in Yellowstone National Park, USA. Known as the Grand Prismatic Spring, it is the largest geothermal pool in the National Park; 110m wide, and 37m deep, and the third largest geothermal spring pool in the world. It was named “Grand Prismatic Spring” by geologists from the Hayden Geological Survey of 1871, as the colours reminded them of the way light is dispersed through a prism.

The vibrant colours occur as a result of pigmented bacteria, and microbial mats that grown around the spring. The bacteria present can be differing colours, ranging from green to red depending on the temperature of the water, and the ratio of chlorophyll to carotenoids present. The colours seen at the Spring vary throughout the seasons, and in the Summer vibrant reds and oranges are common, but in the Winter green is seen. The intense blue colour of water is down to three factors; the natural selective absorption of red light wavelengths by the water, the depth of the water and the purity of the water. The water in the center of the pool is sterile due to the high temperatures; the water has been recorded as reaching 70 degrees Celsius. 






Image; David Mencin


Montana in 3D!

In celebration of the 125th Anniversary of Montana’s Statehood here are a few stereographs from Big Sky Country, all from the series of photographs from the Hayden Survey. (Hayden Survey, William H. Jackson, Photographs, 1869 - 1878) .  

Maybe these will inspire you to enter the Stereoscopic Image category of digitalnz-dpla 's GIF IT UP Challenge!

Looking for more stereographs?  They are not always identified as such, but you can find many in the series of photos from geological survey expeditions, such as the King SurveyPowell Survey, and Hayden Survey, and also in the series of Mathew Brady Civil War photographs.