Poza Verde, Sistema Zacaton
One of comparatively large sinkholes in the unique Sistema Zacatón karst field is Poza Verde.
Map of the site
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Sistema Zacatón is an area with incredible characteristics unparalleled in the world. In total, this area contains some 20 unusual features – sinkholes, caves, springs created by deep groundwater heated by volcanic processes. Karstification processes here continue today as well – acidic groundwater continues to strip away the limestone and deposits it in unusual travertine formations.
Sinkhole with a double bottom
Poza Verde has a diameter of 120 – 150 m. It is hard to access – beautiful blue water is encircled by tall limestone cliffs.
Water in this lake is somewhat cooler than in neighboring cenotes – 28 – 29° C. Unlike other sinkholes nearby, the water here is stratified, with chemocline. Surface water is not acidic. Thus Poza Verde seems to be more like a “normal lake”.
Depth of sinkhole is 40 – 48 m what is comparatively little if compared to neighboring sinkholes. There have been attempts without success to find any large side passages. The bottom of the sinkhole is extremely level.
This is explained by the fact that the bottom of the sinkhole is several meters thick travertine lid formed at some earlier time when the water level was considerably lower. Below this lid, there is located another void filler with thermal water.
- Marcus Gary, Sistema Zacatón, research homepage. Accessed in the 23rd June 2010
Few countries of the world can offer such an array of unique and astounding attractions as Mexico.
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This category includes outstanding sinkholes – large natural depressions or holes, which for most the part represent collapsed caves.
This book illustrates the diversity of hypogene speleogenetic processes and void-conduit patterns depending on variations of the geological environments by presenting regional and cave-specific case studies. The cases include both well-known and newly recognized hypogene karst regions and caves of the world. They all focus on geological, hydrogeological, geodynamical, and evolutionary contexts of hypogene speleogenesis.
The Encyclopedia of Caves and Karst Science contains 350 alphabetically arranged entries. The topics include cave and karst geoscience, cave archaeology and human use of caves, art in caves, hydrology and groundwater, cave and karst history, and conservation and management. The Encyclopedia is extensively illustrated with photographs, maps, diagrams, and tables, and has thematic content lists and a comprehensive index to facilitate searching and browsing.