Raven_Ridge,_Colorado.jpg

Summary

Description Raven Ridge, Colorado.jpg	English: Cretaceous–Paleogene boundary at Raven Ridge in NW Colorado Astronaut photograph ISS018-E-11127 was acquired on December 6, 2008, with a Nikon D2Xs digital camera fitted with an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center. It should be noted that the K-T boundary here is represented by an erosional unconformity along Raven Ridge and rocks immediately below, above and containing the K-T boundary are not present. USGS Geologic Quadrangle Map, Banty Point Quadrangle, Colorado GQ-703.
Date	6 December 2008
Source	http://earthobservatory.nasa.gov/IOTD/view.php?id=36504
Author	NASA

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The original description page was here . All following user names refer to en.wikipedia.

Date/Time	Dimensions	User	Comment
2011-12-22 02:32	720×480× (160971 bytes)	Tillman	New version by Nasa, see file talk page. K-T boundary removed from photo
2009-01-15 00:42	720×480× (156522 bytes)	Tillman	[[K-T Boundary]] at Raven Ridge in NW Colorado Astronaut photograph ISS018-E-11127 was acquired on December 6, 2008, with a Nikon D2Xs digital camera fitted with an 800 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Scie