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Geology continues its reign as the Journal Citation Both the impact factor and five-year impact factor rose
Reports’ #1 ranked geology journal for the eleventh for Lithosphere, reaching 2.662 and a record-high 3.221
year in a row. According to Thomson Reuters, it had respectively.
a 2016 impact factor of 4.635 and a five-year impact
factor of 5.047, making it the first GSA publication to Geosphere’s impact factor increased to 2.304, with a
cross the 5.0 threshold. five-year impact factor of 2.466.

The Geological Society of America Bulletin’s impact While Clarivate Analytics (formally Thomson Reuters)`
factor was 4.212, with a five-year impact factor of does not produce impact factors for book series, it
4.566. Bulletin ranks #15 among multidisciplinary indexes GSA’s Special Papers, and Memoirs in its Book
geoscience journals. Citation Index, which is part of the Web of Science.

Explore GSA’s journals and books at

www.geoscienceworld.org/gsa

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.

The Web of Science’s #1 ranked geology journal
for 10 years in a row.

FREE online access to every
Geology issue is included with
all 2018 GSA Memberships.

Not a Member? Join Now! www.geosociety.org/members/

62 GSA Today | September 2017