Puebla region,Mexico,infrared satellite image. North is at top. Vegetation is green or red. The city of Puebla is at centre (purple area),with the Malinche volcano (green) at upper right. Numerous fields are seen in the surrounding valley. To the south of the city is the Valsequillo Reservoir (black). In 2003,a large collection of prehistoric footprints (animal and human) were discovered in the Cerro Toluquilla quarry on the north shore of the reservoir. The footprints had been preserved in a layer of volcanic ash. In 2005,they were dated to about 40,000 years ago,challenging previously accepted theories about when the Americas were colonised. The area shown here is around 100 kilometres across. Image obtained by a Landsat satellite | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / NASA |
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