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The Getafe rock: trajectory of fall, effects of the impact, and morpho-textural evidence of flight

dc.contributor.authorMartínez Frías, J.
dc.description.abstractOn 21st June, 1994, at approximately 12 noon local time, a rock, weighing 1.417 kg and measuring 18 x 8.5 x 8 cm, struck a car, which was travelling south on the Madrid-Andalucia róed (Cetafe city, south .Madrid). This area is open country made up of marls, gypsum beds and claystones, without bridges or other high places from which the rock could have been thrown. The incident was spectacular. The rock impacted the car at about 30° from the horizontal arid hit thè steering wheel arid the driver's right hand with;such force that the steel wheel was deformed:- This work constitutes the first contribution on the study of the Cetafe rock (CR), displaying a detailed analyses of the trajectory of fall, effects of impact and morphotextural evidence of flight: The CR is a semi-oriénted specimen (apex angle _75°), with an external scoriaceous texture which resembles either ari industriai slag or the highly vesicular «scoriaceous-type» micrometeorites (AM10 and M4) which were recovered in Antarctica. It does not appear to have fusion crust, although textural and colour differences exist between its external and internal parte. At least two different systems of friction striae as well as two types (milky and dark) of droplet-globules (100 m-500 m) were found scattered on its frontal, smooth surface. Some of these show presence of impact microcraters. Although the circumstances surrounding the fall are very well documented and despite clear evidence of flight were found, the CR does not exactly match ariy ofthe previously classified meteorites nor any known rocks (terrestrial or extraterrestrial)en_US
dc.publisherSociedad Geológica de Españaen_US
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherCetafe rocken_US
dc.subject.otherEvidence of flighten_US
dc.titleLa roca de Getafe: trayectoria de caída, efectos del impacto y marcadores morfotexturales de vueloen_US
dc.titleThe Getafe rock: trajectory of fall, effects of the impact, and morpho-textural evidence of flighteng

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Atribución-NoComercial-SinDerivadas 3.0 España
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