July media highlights: GEOLOGY and GSA TODAY

BOULDER, Co. Following are highlights from the July issue of GEOLOGY and a summary of the science article from the July issue of GSA TODAY, published by the Geological Society of America. Please discuss articles of interest with the authors before publishing stories on their work, and please make reference to GEOLOGY or GSA TODAY in stories published. Contact Ann Cairns at GSA for copies of articles and for additional information or assistance.


Upper Cenozoic chronostratigraphy of the southwestern Amazon Basin. Kenneth E. Campbell, Jr., Natural History Museum of Los Angeles County, Los Angeles, CA, USA; et al. Pages 595-598 The biological diversity of the Amazon Basin of South America has been poorly understood due to a lack of information about the geologic history of the Amazon Basin, and in particular, the lack of accurate dates or ages for the rocks of lowland Amazonia. This paper provides the first two accurate dates, based on samples of volcanic ashes taken from lowland strata, of the most recent sedimentary deposits of Amazonia. These ash ages allowed the authors to date fossil deposits within southwestern Amazonia and confirm the presence of a mammal derived from North American ancestors in South America more than 9 Ma. This mammalan extinct, elephant-like gomphotherethus becomes the first known participant in the late Cenozoic faunal exchange between the two continents. From the younger ash age the authors were able to postulate that deposition within southwestern Amazonia continued until ~2.5 Ma, when the modern aspects of the region began to develop.

Sedimentary evidence of intense hurricane strikes from New Jersey. Jeffrey P. Donnelly, Brown University, Providence, RI, USA (Current Address: Woods Hole Oceanographic Institution, Woods Hole, MA, USA); et al. Pages 615-618 Intense, landfalling hurricanes, such as Hurricane Andrew in 1992, often result in substantial loss of life and resources. Several hurricanes (1938, 1944,

Contact: Ann Cairns
303-447-2020 x 1156
Geological Society of America

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