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Compiled by J.D. Walker, J.W. Geissman,
S.A. Bowring, and L.E. Babcock, 2018
Use this colorful, poster-size
version of GSA’s Geologic Time
Scale (v. 5.0) to decorate your office
or classroom.
GTSPOS | 20" × 26" | $9.95
FULL-COLOR POSTER
BUY ONLINE } https://rock.geosociety.org/store/
toll-free 1.888.443.4472 | +1.303.357.1000, option 3 | gsaservice@geosociety.org
www.geosociety.org/gsatoday 33