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Comments on GSA Today science and Groundwork articles are limited to 900 words. Submit your comment to the GSA Today science editors no more than three weeks after the date of publication of the related article. Comments and Replies are not printed in GSA Today, but will be posted to this Web page, and an announcement will be published in GSA Today. Learn more.
Preexisting fractures and the formation of an iconic American landscape: Tuolumne Meadows, Yosemite National Park, USA (original article)
COMMENT: Jeffrey P. Schaffer,
   Published online March 2015, pages e34, doi: 10.1130/GSATG239C.1
REPLY: Richard A. Becker, Basil Tikoff, Paul R. Riley, Neal R. Iverson
   Published online March 2015, page e35, doi: 10.1130/GSATG245Y.1
Late Oligocene–early Miocene Grand Canyon: A Canadian connection? (original article)
COMMENT: Eric Clausen
   Published online March 2014, pages e32, doi: 10.1130/GSATG202C.1
REPLY: James W. Sears
   Published online March 2014, page e33, doi: 10.1130/GSATG213Y.1
The geological legacy of Hurricane Irene: Implications for the fidelity of the paleo-storm record (original article)
COMMENT: Jeffrey P. Donnelly, John B. Anderson, Andrea D. Hawkes, Ervin G. Otvos, Michael R. Toomey, Peter J. van Hengstum, Davin J. Wallace, Jonathan D. Woodruff
   Published online March 2014, pages e28–e29, doi: 10.1130/GSATG205C.1
REPLY: Scott P. Hippensteel, Matthew D. Eastin, William J. Garcia
   Published online March 2014, page e30-31, doi: 10.1130/GSATG209Y.1
Open-source archive of active faults for northwest South America (original article)
COMMENT: Laurence Audin and 12 others
   Published online October 2013, pages e24–e25, doi: 10.1130/GSATG169C.1
REPLY: Gabriel Veloza, Richard Styron, and Michael Taylor
   Published online October 2013, page e26-27, doi: 10.1130/GSATG193Y.1
Is the Anthropocene an issue of stratigraphy or pop culture? (original article)
COMMENT: Jan Zalasiewicz, Alejandro Cearreta, Paul Crutzen, Erle Ellis, Michael Ellis, Jacques Grinevald, John McNeill, Clément Poirier, Simon Price, Dan Richter, Mary Scholes, Will Steffen, Davor Vidas, Colin Waters, Mark Williams, and Alexander P. Wolfe
   Published online September 2012, pages e21-e22, doi: 10.1130/GSATG162C.1
REPLY: Whitney J. Autin and John M. Holbrook
   Published online September 2012, page e23, doi: 10.1130/GSATG164Y.1
No Late Cambrian shoreline ice in Laurentia
COMMENT: Ed Landing
  PDF (121KB). Published Online: March 2011, page e19, DOI: 10.1130/G113C.1
REPLY: Anthony C. Runkel, Tyler J. Mackey, Clinton A. Cowan, David L. Fox
  PDF (116KB). Published Online: March 2011, page e19, DOI: 10.1130/G124Y.1
A shift from lithostratigraphic to allostratigraphic classification of Quaternary glacial deposits
COMMENT: Mark D. Johnson, Carrie Jennings and Howard Hobbs
  PDF (122KB). Published Online: July 2009, page e15, DOI: 10.1130/GSATG52C
REPLY: by M.E. Räsänen, J.M. Auri, J.V. Huitti, A.K. Klap, and J.J. Virtasalo
  PDF (100KB). Published Online: July 2009, page e17, DOI: 10.1130/GSATG60Y
Impacts, mega-tsunami, and other extraordinary claims
COMMENT: Dallas H. Abbott, Edward F. Bryant, Viacheslav Gusiakov, W. Bruce Masse, Dee Breger
  PDF (118KB). Published Online: April 2008, page e12, DOI: 10.1130/GSATG9C.1
COMMENT: Richard B. Firestone, Allen West
  PDF (114KB). Published Online: April 2008, page e13, DOI: 10.1130/GSATG11C.1
REPLY: Nicholas Pinter and Scott E. Ishman
  PDF (113KB). Published Online: April 2008, page e14, DOI: 10.1130/GSATG13Y.1
The non-equilibrium landscape of the Sierra Nevada, California
COMMENT: H.F. Garner
  PDF (499KB). Published Online: March 2006, page e10, DOI: 10.1130/GSATOFe10
REPLY: M.K. Clark, G. Maheo, J. Saleeby, and K. Farley
  PDF (107KB). Published Online: March 2006, page e11, DOI: 10.1130/GSATOFe11
Subduction Zone Backarcs, Mobile Belts, and Orogenic Heat
COMMENT: David D. Blackwell
  PDF (1.8MB). Published Online: August 2005, page e8, DOI 10.1130/1052-5173(2005)015<e8:SZBMBC>2.0.CO;2
CO2 as a primary driver of Phanerozoic climate:
COMMENT: Nir Shaviv and Jan Veizer
  PDF (143KB). Published Online: June 2004, page e4, DOI 10.1130/1052-5173(2004)014<e4:CAAPDO>2.0.CO;2
An Alternative Earth
COMMENT: M.J. Van Kranendonk, Kevin Cassidy
  PDF (141KB) Published in print: March 2004, page 14, DOI 10.1130/1052-5173(2004)014<14:AAER>2.0.CO;2
REPLY: Warren B. Hamilton
  PDF (140KB). Published in print: March 2004, page 14, DOI 10.1130/1052-5173(2004)014<14:AAEC>2.0.CO;2
COMMENT: Andrew Glikson
  PDF (288KB). Published Online: March 2004, page e1, DOI 10.1130/1052-5173(2004)014<e1:AAEC>2.0.CO;2
REPLY: Warren B. Hamilton
  PDF (288KB). Published Online: March 2004, page e2, DOI 10.1130/1052-5173(2004)014<e2:AAER>2.0.CO;2