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Bolivia 2012 "Paleontological Deposits of Chuquisaca"
Issue Date 08.06.2012 ID Michel: Scott: Stanley Gibbons: Yvert: UPU: Category: pR Author Elcobol Stamps in set 4 Value Bs. 0.59
Size (width x height) 32x43mm Layout sheet of 100 stamps Products FDC x1 Paper gummed couche Perforation 13.5x13.5 Print Technique Offset Printed by Industrias Lara Bisch SA Quantity 20,000 Issuing Authority Empresa de Correos de Bolivia
The Cal Orck'o (Quechua for Chalk Mountain) is one of three dinosaur track-sites that are competing for World Heritage status (the others are in South Korea and in Spain/Portugal). This site near the Bolivian capital Sucre is the biggest in its kind. Over 5000 imprints and 462 trackways from various different animal species have been found. They were discovered in 1994, when they were exposed by erosion on a wall disused by the nearby cement factory. The wall is 1500 meters wide and 130 meters at its highest, and contains 7 layers of track and fossil sediments.
believed that the rocks in the area date back some 68 million years --
well before the Andes were formed. Supposedly, there was a lake here
surrounded by a forest. Dinosaurs trudged through the mud in the forest
toward the lake in search of water. Before the footprints had a chance
to disappear (about a 2-week time period), they would be covered by
sediment, which settled over the mud and preserved the prints. Around 68 million years ago,
an enormous volcanic eruption threw millions of cubic meters of ash
into space. As this matter fell on the footprints of the dinosaurs, the
prints were covered with a thick layer that protected them from colic
and pluvial erosion. Eventually, subsequent ash deposits and
sedimentary materials carried by the rivers that flowed into the lake
created some more sedimentary layers that turned these footprints into
rocks. The rock solid formations occurred due to the pressure exerted
on them through millions of years.
At first glance, the dinosaur tracks look like simple holes in rocks. But after your eyes adjust, you'll start to see distinct patterns of movement. All of a sudden, it's very easy to envision dinosaurs slopping through the mud, trying to escape from their enemies, and searching for water. Theres also an audiovisual room on site where they show dino-documentaries (not directly related to Cal Orcko), and a small museum where you can see some footprints in close-up. And of course there are the obligatory colourful lifesize dinosaur-models that you see at dino-parks all over the world.
The wall of Cal Orck'o
Dinosaur's footpint on the wall
Scientist of Naturhistorisches Museum Basel claims up to study the footprints
Scientist of Naturhistorisches Museum Basel at on of the footprints
Various dinosaur walk over there, in betweem them some small dinos.
The bilingual guides will be able to tell you their theories about which dinosaurs were doing what when they walked through this area 68 million years ago. The Dino-Truck can get you here
Audiovisual room inside
References: Info Brochure Naturhistorische Museum Basel World Heritage Site University of Basel Flickr
Latest update 04.07.2014 Any feedback, comments or even complaints are
welcome: firstname.lastname@example.org (you can
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Latest update 04.07.2014
Any feedback, comments or even complaints are welcome: email@example.com (you can email me on ENglish, DEutsch, or RUssian)