P. A. Bland,^1* C. R. de Souza Filho,² A. J. T. Jull,³ S. P. Kelley,⁴ R. M. Hough,⁵ N. A. Artemieva,⁶ E. Pierazzo,⁷ J. Coniglio,⁸ L. Pinotti,⁸ V. Evers,⁹ A. T. Kearsley¹⁰

Impact glass associated with 11 elongate depressions in the Pampean Plain of Argentina, north of the city of Río Cuarto, was suggested to be proximal ejecta related to a highly oblique impact event. We have identified about 400 additional elongate features in the area that indicate an aeolian, rather than an impact, origin. We have also dated fragments of glass found at the Río Cuarto depressions; the age is similar to that of glass recovered 800 kilometers to the southeast. This material may be tektite glass from an impact event around 0.48 million years ago, representing a new tektite strewn field.

¹ Planetary and Space Sciences Research Institute, The Open University, Milton Keynes MK7 6AA, UK.
² Instituto de Geociências, Universidade Estadual de Campinas, Campinas, Brazil.
³ NSF-Arizona Accelerator Mass Spectrometry Laboratory, University of Arizona, 1118 East Fourth Street, Tucson, AZ 85721, USA.
⁴ Department of Earth Sciences, The Open University, Milton Keynes MK7 6AA, UK.
⁵ Earth and Planetary Sciences, Western Australian Museum, Francis Street, Perth, Western Australia 6000.
⁶ Institute for Dynamics of Geospheres, Russian Academy of Sciences, Leninsky Prospect 38/6, Moscow, Russia 117939.
⁷ Planetary Science Institute, Tucson, AZ 85705, USA.
⁸ Departamento de Geología, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
⁹ Institute of Educational Technology, The Open University, Milton Keynes MK7 6AA, UK.
¹⁰ Geology (Biological and Molecular Sciences), Oxford Brookes University, Headington, Oxford OX3 OBP, UK.
^*   To whom correspondence should be addressed. E-mail: p.a.bland{at}open.ac.uk