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physical forms. Robotic explorers increasingly carry instruments                     Grotzinger, J.P., Arvidson, R.E., Bell, J.F., III, Calvin, W., Clark, B.C., Fike, D.A.,
capable of identifying the organic or isotopic tracers of life, while                      Golombek, M., Greeley, R., Haldemann, A., Herkenhoff, K.E., Jolliff, B.L.,
at the same time examining rocks for microscopic indications of                            Knoll, A.H., Malin, M., McLennan, S.M., Parker, T., Soderblom, L., Sohl-
fossilized material.                                                                       Dickinson, J.N., Squyres, S.W., Tosca, N.J., and Watters, W.A., 2005,
                                                                                           Stratigraphy and sedimentology of a dry to wet eolian depositional system,
  And what of the newly recognized additions to the solar                                  Burns Formation, Meridiani Planum, Mars: Earth and Planetary Science
system’s retinue of planets, now being found in the frigid regions                         Letters, v. 240, p. 11–72, doi: 10.1016/j.epsl.2005.09.039.
beyond Pluto, and the bonanza of extrasolar planets (~1800 at last
count) that have been discovered orbiting other stars? At present,                   Jolliff, B.L., Gillis, J.J., Haskin, L.A., Korotev, R.L., and Weiczorek, M.A., 2000,
any information about these bodies is extremely limited, but as                            Major lunar crustal terranes: Surface expressions and crust-mantle origins:
more data accrue, geological reasoning will be needed for mean-                            Journal of Geophysical Research, v. 105, E2, p. 4197–4216, doi:
ingful interpretation.                                                                     10.1029/1999JE001103.

  This is an opportunistic time for geoscientists—astronomy has                      Jolliff, B.L., Wieczorek, M.A., Shearer, C.K., and Neal, C.R., 2006, New Views of
basically abdicated much of the solar system to geology. Planets                           the Moon: Mineralogical Society of America Reviews in Mineralogy and
and smaller bodies are no longer astronomical points of light, but                         Geochemistry, v. 60, plate 3.10.
are increasingly recognized as worlds shaped by more or less
familiar geologic processes. This shift of a substantial quantity of                 McSween, H.Y., Taylor, G.J., and Wyatt, M.B., 2009, Elemental composition of
scientific real estate has literally redefined the reach of our disci-                     the martian crust: Science, v. 324, p. 736–739, doi: 10.1126/
pline. Geology has staked its claim on the planets and must play                           science.1165871.
the central role in exploring this frontier.
                                                                                     Prettyman, T.H., Mittlefehldt, D.W., Yamashita, N., Lawrence, D.J., Beck, A.W.,
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                                                                                           protoplanet Vesta: Icarus, doi: 10.1016/j.icarus.2014.06.027.

New Publication                                                                                                                                                               GSA TODAY | www.geosociety.org/gsatoday/
Calendar for
GSA Today

  GSA Today is published 11 times
per year, and this won’t change. What
will change is that the March issue
will now be combined with April, and
we will have an independent May issue
(instead of March). So look for your first
dedicated Annual Meeting issue in May.

                              As always, GSA Today is open-access online at

                 www.geosociety.org/gsatoday/.

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