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Date:4/23/2013

GES00843.1.

This work presents for the first time the geologic, geochronologic, and geochemical characteristics of the rock known as Pea de Bernal, at Quertaro, central Mxico. In spite of being an important natural monument and that in 2009 it was included in the list of protected worldwide patrimonies of United Nations Educational, Scientific, and Cultural Organization (UNESCO), very little was known about this prominent peak that, with a 433 m height, is apparently the highest monolith of the world. Study results lead Gerardo J. Aguirre-Daz and colleagues to conclude that Pea de Bernal is a volcanic spine-type dome with a dacitic composition (SiO2 = 67 wt%), which was forcefully intruded practically as a solid plug in the country rock about 8.7 million years ago. This is the first scientific study carried out on this geologic feature. In addition, it should be emphasized that Pea de Bernal is a sacred site for indigenous peoples celebrations, which pre-Hispanic traditions still continue at present, that Pea de Bernal is a reference site for thousands of tourists and mountain climbers, and that Pea de Bernal is also known as the main entrance to the Sierra Gorda mountain area, which was declared a Biosphere Natural Reserve by UNESCO in 2001.


Point-Based Computing on Scanned Terrain with LiDAR Viewer
Oliver Kreylos et al., W.M. Keck Center for Active Visualization in the Earth Sciences, University of California, Davis, California 95616, USA. Published online 4 Apr. 2013; http://dx.doi.org/10.1130/GES00705.1. Themed issue: Seeing the True Shape of Earth's Surface: Applications of Airborne and Terrestrial LiDAR in the Geosciences.

Point-based computing is an alternative approach to processing and visualization of very large unstructured 3-D point clouds, such as those collected by high-resolution laser scans of terrain, via LiDAR (Light Detection and
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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