Poza Verde, Sistema Zacaton

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One of comparatively large sinkholes in the unique Sistema Zacatón karst field is Poza Verde.

Sistema Zacatón is 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 to other sinkholes nearby, 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 neighbouring sinkholes. There have been attempts without success to find any large side passages. Bottom of sinkhole is extremely level.

This is explained by the fact that the bottom of sinkhole is several metres thick travertine lid formed at some earlier time when water level was considerably lower. Below this lid there is located another void filler with thermal water.

References

  1. Marcus Gary, Sistema Zacatón, research homepage. Accessed in the 23rd June 2010

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Poza Verde, Sistema Zacaton 22.993444, -98.161507 Poza Verde, Sistema Zacaton
Coordinates: 22.9934 N 98.1615 W
Categories: Sinkholes, Ecosystems, Lakes and streams
Values: Geology, Biology
Rating: (1.5 / 5)
Address: North America, Mexico, Tamaulipas, southern part of the state, 12 km north-west from Aldama town
Alternate names: Cenote Verde
Depth: 48 m

Landmarks of Mexico

El Castillo pyramid, Chichen Itza
El Castillo pyramid, Chichen Itza / , Flickr / CC BY 2.0
Few countries of the world can offer such array of unique and astounding attractions as Mexico.

Area of this country was cradle of several highly developed indigenous civilizations and some regions in the country are dotted with remnants of ancient cities with temples, palaces and pyramids.

Sinkholes

World's deepest sinkhole - Xiaozhai tiankeng, with tourist route visible
World’s deepest sinkhole – Xiaozhai tiankeng, with tourist route visible / Brookqi, Wikimedia Commons, public domain
Category includes outstanding sinkholes – large natural depressions or holes, which for most part represent collapsed caves.

Recommended books

Hypogene Karst Regions and Caves of the World


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.

Encyclopedia of Caves and Karst Science


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