Poza del Caracol, Sistema Zacaton

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ne of the prominent features of the unique Sistema Zacatón is Poza del Caracol – small, very deep sinkhole which is not fully explored this far.

Sistema Zacatón

Sistema Zacatón is area with incredible characteristics unparalleled in the world. In total 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.

Poza el Caracol

Poza del Caracol belongs to the central, most interesting group of these karst formations. Formation of this sinkhole continues up to this day – vertical cliffs around it often have landslides. El Caracol has not been fully investigated – it has been dived up to 114 m depth. It contains passage which leads in the direction of the neighbouring El Zacatón but most likely does not reach it.

Acidic water in this sinkhole has the highest level of dissolved hydrogen sulfide if compared with neighbouring sinkholes. Content of hydrogen sulfide fluctuated in the pool daily – this may be explained by microbial activity. Travertine walls here are entirely covered with purple, red and green biomats.

Temperature of water in El Caracol is 30° C, acidity – 6.9 pH. Water temperature in the sinkhole is remarkably similar to the temperature in nearby El Zacatón although both caves do not have direct connection.

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Poza del Caracol, Sistema Zacaton 22.993791, -98.163776  Poza del Caracol, Sistema Zacaton
Coordinates: 22.9938 N 98.1638 W
Categories: Sinkholes, Lakes and streams
Values: Geology, Biology
Rating: (2 / 5)
Address: North America, Mexico, Tamaulipas, southern part of the state, 12 km north-west from Aldama town
Depth: Full depth not reached, measured up to 114 m depth

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


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.

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