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ISSN 0016-7606
EISSN 1943-2674
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GSA Bulletin May 01, 2017, Vol.129, 515-533. doi:10.1130/B31432.1
GSA Bulletin May 01, 2017, Vol.129, 534-546. doi:10.1130/B31460.1
GSA Bulletin May 01, 2017, Vol.129, 547-569. doi:10.1130/B31541.1
GSA Bulletin May 01, 2017, Vol.129, 570-581. doi:10.1130/B31587.1
GSA Bulletin May 01, 2017, Vol.129, 582-593. doi:10.1130/B31582.1
GSA Bulletin May 01, 2017, Vol.129, 594-606. doi:10.1130/B31378.1
GSA Bulletin May 01, 2017, Vol.129, 607-624. doi:10.1130/B31532.1
GSA Bulletin May 01, 2017, Vol.129, 625-648. doi:10.1130/B31474.1
GSA Bulletin May 01, 2017, Vol.129, 649-676. doi:10.1130/B31593.1
GSA Bulletin May 01, 2017, Vol.129, 677-697. doi:10.1130/B31511.1
GSA Bulletin May 01, 2017, Vol.129, 698-714. doi:10.1130/B31604.1
GSA Bulletin May 01, 2017, Vol.129, 715-731. doi:10.1130/B31509.1
GSA Bulletin May 01, 2017, Vol.129, 732-749. doi:10.1130/B31551.1
GSA Bulletin May 01, 2017, Vol.129, 750-766. doi:10.1130/B31631.1

Retraction

GSA Bulletin May 01, 2017, Vol.129, 767. doi:10.1130/B31543.1

ERRATUM

GSA Bulletin May 01, 2017, Vol.129, 768. doi:
  • Cover Image

    Cover Image

    issue cover

    Cover: Microlepidopalla mira, an organic-walled marine microfossil from the Galeros Formation of the Neoproterozoic Chuar Group, Grand Canyon. This species has also been found in the lower part of the Neoproterozoic Uinta Mountain Group of Utah. The Chuar and Uinta Mountain groups, along with the Pahrump Group of California, are proposed to have been deposited in marine intracratonic basins ca. 740–780 Ma. Further correlation with other Laurentian strata, as well as more exotic strata, suggest that these basins may record global organic evolutionary patterns and global changes in carbon cycling prior to the onset of the first Snowball Earth glaciation. Fossil is ~30 μm in diameter. See “Synthesis of the 780–740 Ma Chuar, Uinta Mountain, and Pahrump (ChUMP) groups, western USA: Implications for Laurentia-wide cratonic marine basins” by Dehler et al., p. 607–624.

    Photo by: Susannah M. Porter

    Cover design by: Eric Christensen

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