• Vol 27 No 3 (2010)

    Cover image:
    Outcrop of the Cuicuiltic Tuff (late Pleistocene) in the northern part of the Los Potreros scarp, Los Humeros caldera, Puebla, Mexico. This interstratified fall deposit resulted from an explosive eruption of trachydacitic magma and contemporaneous fissure eruptions of basaltic andesitic magma from separate vents. Scale: 1 m (lower central part). Photo: Pablo Dávila Harris.

  • Vol 27 No 2 (2010)

    Cover image:
    Outcrop of Carboniferous pillow basalts in the western Acatlán complex, approximately 10 km to the west of Olinalá, Guerrero, Mexico. These tholeiitic, N-MORB-type basalts are interbedded with quartzite and phyllite within the El Naranjo block and belong to the Progreso Unit, which underwent greenschist facies metamorphism and polyphase deformation during the Carboniferous and Permian. Photo: Carlos Ortega Obregón.

  • Vol 27 No 1 (2010)

    Cover image:
    Polysomatic barred olivine chondrule composed of several sets of parallel, bar-like olivine crystals with different crystallographic orientation (Escalón meteorite, H4). Photograph with crossed nicols; chondrule diameter of 0.95 mm. Photo: Adela Margarita Reyes.

  • Vol 26 No 3 (2009)

    Cover image:
    Polysomatic barred olivine chondrule composed of several sets of parallel, bar-like olivine crystals with different crystallographic orientation (Escalón meteorite, H4). Photograph with crossed nicols; chondrule diameter of 0.95 mm. Photo: Adela Margarita Reyes.

  • Vol 26 No 2 (2009)

    Cover image:
    Pore mounds on the surface of a specimen of Laeviheterohelix pulchra from the Santonian-Campanian of the Falkland plateau (DSDP site 511). Scanning electron microscope photograph; scale bar: 2 μm. See also in this issue the article by Marius Dan Georgescu “Taxonomic revision and evolutionary classification of the biserial Cretaceous planktic foraminiferal genus Laeviheterohelix Neder­bragt, 1991”. Photo: Dan Georgescu.

  • Vol 26 No 1 (2009)
  • Vol 25 No 3 (2008)
  • Vol 25 No 2 (2008)
  • Vol 25 No 1 (2008)
  • Vol 24 No 3 (2007)
  • Vol 24 No 2 (2007)
  • Vol 24 No 1 (2007)
  • Vol 23 No 3 (2006)
  • Vol 23 No 2 (2006)
  • Vol 23 No 1 (2006)
  • Vol 22 No 3 (2005)
  • Vol 22 No 2 (2005)
  • Vol 22 No 1 (2005)
  • Vol 21 No 3 (2004)
  • Vol 21 No 2 (2004)
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