Catherine Corrigan Catherine Corrigan Catherine Margaret Corrigan (born 1972), often known as Cari Corrigan, is an American scientist best known as a curator of the meteorite collection at the Smithsonian Institution. She is a scientist in the Department of Mineral Science at the National Museum of Natural History. Corrigan obtained a Bachelor of Science in 1995 and a Master of Science in 1998, both in Geology at Michigan State University. Her master's thesis was titled "The Composition of Impact Breccias from the Chicxulub Impact Crater, Yucatan Peninsula, Yucatan, Mexico". She later earned a Ph.D in Planetary Science at Case Western Reserve University
Ritland crater Ritland crater The Ritland crater is an impact crater at Ritland farm in Hjelmeland municipality in eastern Rogaland county, Norway. The crater is about east of the village of Hjelmelandsvågen and about south of the Jøsenfjorden. The crater is about in diameter, and was created when a meteorite with an estimated diameter of struck here about 500–600 million years ago. The crater was later buried by sediments, of which it has been partly recovered. The structure was first discovered as a possible (suspected) impact crater in 2000 by geologist Fridtjof Riis. The Research Council of Norway has funded scientific research