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New Impact Factors Released,
Geology Still #1

Geology has continued its reign as the Journal Citation
Reports’ #1 ranked geology journal for the tenth year in a row.
According to Thomson Reuters, it had a 2015 impact factor of
4.548 and a five-year impact factor of 4.813.

Both the impact factor and five-year impact factor rose for
The Geological Society of America Bulletin, reaching 4.332 and
4.730, respectively. Bulletin remains the #12 ranked multidisci-
plinary geosciences journal.

Lithosphere has also held steady as the #5 ranked geology
journal. Its 2015 impact factor was 2.618, and its five-year
impact factor rose to 2.858.

Geosphere’s impact factor increased to 2.262, with a five-year
impact factor of 2.573.

While Thomson Reuters does not produce impact factors for
book series, it indexes GSA’s Special Papers, Memoirs, and
Reviews in Engineering Geology volumes in its Book Citation
Index, which is part of the Web of Science.

This artist's concept shows a celestial body about the size of our moon slamming at great speed into a body the size of Mercury. NASA's Spitzer Space Telescope found evidence that
a high-speed collision of this sort occurred a few thousand years ago around a young star, called HD 172555, still in the early stages of planet formation. The star is about 100 light-
years from Earth. 26 August 2009. www.nasa.gov/multimedia/imagegallery/image_feature_1454.html. Credit: NASA/JPL-Caltech.