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Monumento Natural Bosques Petrificados, Deseado Department, Santa Cruz, Argentinai
Regional Level Types
Monumento Natural Bosques Petrificados- not defined -
Deseado DepartmentDepartment
Santa Cruz- not defined -

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Latitude & Longitude (WGS84): 47° 40' 0'' South , 68° 10' 3'' West
Latitude & Longitude (decimal): -47.66667,-68.16750
GeoHash:G#: 4rx8bf9cw
Köppen climate type:BSk : Cold semi-arid (steppe) climate

Petrified Forest Natural Monument.
Almost in the geographical center of the desert steppe of the Santa Cruz province, 150 km Puerto Deseado and 60 of the national route Nº 3, lies the petrified forest.
"Madre e Hija" (405 metres above sea level), with its two characteristic peaks, is the dominant elevation over the Valley of "Laguna Grande". There is the Petrified forest national monument with its fossil Araucarias. This peak is a volcano off and is responsible for the geological zone configuration and stands just 200 metres above the surface of the Valley, although it is not responsible for the cataclysm that produced the degree of las araucarias, that happened several million years before the birth of this volcano.
During the Jurassic of the Mesozoic era, 150 million years ago, this desert was an orchard, and the immense Araucaria Mirabilis and Para-Araucarias of more than 160 metres high and with some specimens that lived more than 1,000 years, gave shade and food to the dinosaurs of the region. Then, at the end of the Middle Jurassic, forests of Araucarias fell by terrible winds and were covered by the ashes of intense volcanic activity. Later, rainwater charged with sales of silicon to traverse that ash. These Silicon salts underwent the plant tissue of las Araucarias replacing it. The process by which the oxide of Silicon replaced plant cells of these trees, literally turning them into stone, was so gradual and complete that nothing was lost from the original structure of plant cells that, even today, can be identified easily in the laboratory. Perhaps the only thing that altered was its original color: reddish today by the presence of iron oxide. Most of the logs of the forest are prepared with the Cup to the East and the root to the West. Almost everyone is cut in slices or segments. The reason for the segmentation is not entirely clear. It may have been the same weight from the ashes, or the different geological movements. The truth is that all courts respond to the original structure of the trunks, i.e. they failed in the weaker party. Some of the fossils measured 35 meters long and 3 in diameter.
Currently it is prohibited to remove material from the Park to ensure their conservation.
The floor is a thick cushion of petrified Araucaria splinters and cones of Araucaria and fossilized Ammonites are.
Main mineralization: Wood Opal, Opal, Chalcedony, Jasper, Quartz, Agate, Manganese oxides, Iron oxides.

Regions containing this locality

South America Plate

Plate - 2,172 mineral species & varietal names listed

Patagonia, Argentina/Chile

Region - 328 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

7 valid minerals.

Detailed Mineral List:

Formula: Na(AlSi2O6) · H2O
Formula: CaCO3
Formula: K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Formula: (Ca,Na)5(Si27Al9)O72 · 26H2O
'Iron Ochre'
Reference: Raúl Jorge Tauber Larry
Formula: (Fe,O,OH,H2O)
Reference: Raúl Jorge Tauber Larry
'Manganese Oxides'
Reference: Raúl Jorge Tauber Larry
Formula: (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Formula: SiO2 · nH2O
Reference: Raúl Jorge Tauber Larry
Opal var: Jasper Opal
Reference: Raúl Jorge Tauber Larry
Opal var: Wood Opal
Formula: SiO2 · nH2O
Reference: Raúl Jorge Tauber Larry
Formula: SiO2
Reference: Raúl Jorge Tauber Larry
Quartz var: Agate
Reference: Raúl Jorge Tauber Larry
Quartz var: Chalcedony
Formula: SiO2
Reference: Raúl Jorge Tauber Larry
Quartz var: Jasper
Reference: Raúl Jorge Tauber Larry
'Stilbite subgroup'
'Zeolite Group'

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Opal4.DA.10SiO2 · nH2O
var: Jasper Opal4.DA.10SiO2 · nH2O
var: Wood Opal4.DA.10SiO2 · nH2O
var: Agate4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
var: Jasper4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Heulandite-Ca9.GE.05(Ca,Na)5(Si27Al9)O72 · 26H2O
Mordenite9.GD.35(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Zeolite Group9.G0.
Unclassified Minerals, Rocks, etc.
Iron Ochre-
Manganese Oxides-
Stilbite subgroup-

List of minerals arranged by Dana 8th Edition classification

Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Heulandite-Ca77.1.4.1(Ca,Na)5(Si27Al9)O72 · 26H2O
Mordenite77.1.6.1(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Unclassified Minerals, Rocks, etc.
'Iron Ochre'-
'Manganese Oxides'-
var: Jasper Opal
-SiO2 · nH2O
var: Wood Opal-SiO2 · nH2O
var: Agate
var: Chalcedony-SiO2
var: Jasper-SiO2
'Stilbite subgroup'-
'Zeolite Group'-

List of minerals for each chemical element

H AnalcimeNa(AlSi2O6) · H2O
H CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
H Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
H Limonite(Fe,O,OH,H2O)
H Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
H OpalSiO2 · nH2O
H Opal (var: Wood Opal)SiO2 · nH2O
C CalciteCaCO3
O AnalcimeNa(AlSi2O6) · H2O
O CalciteCaCO3
O CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
O Quartz (var: Chalcedony)SiO2
O Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
O Limonite(Fe,O,OH,H2O)
O Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
O OpalSiO2 · nH2O
O QuartzSiO2
O Opal (var: Wood Opal)SiO2 · nH2O
Na AnalcimeNa(AlSi2O6) · H2O
Na Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Na Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Mg CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Al AnalcimeNa(AlSi2O6) · H2O
Al Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Al Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Si AnalcimeNa(AlSi2O6) · H2O
Si CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Si Quartz (var: Chalcedony)SiO2
Si Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Si Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Si OpalSiO2 · nH2O
Si QuartzSiO2
Si Opal (var: Wood Opal)SiO2 · nH2O
K CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
K Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Ca CalciteCaCO3
Ca Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Ca Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
Fe CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Fe Limonite(Fe,O,OH,H2O)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Tertiary - Cretaceous
2.588 - 145 Ma

ID: 3189060
Mesozoic-Cenozoic volcanic rocks

Age: Phanerozoic (2.588 - 145 Ma)

Lithology: Volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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Raúl Jorge Tauber Larry (1970).

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