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Tree remains that have undergone petrifaction, as seen in Petrified Forest National Park. In geology, petrifaction or petrification (from Ancient Greek πέτρα (pétra) 'rock, stone') is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals.
They are the largest known animal petroglyphs in the world. [ 2 ] In the surroundings, 828 images have been found engraved on the rocks, of which 704 are animals (cattle, giraffes, ostriches, antelopes, lions, rhinoceros, and camels), 61 are human, and 17 are inscriptions in Tifinâgh .
Petrified forests of dicksoniaceae (specifically Psaronius and Tietea singularis) and arthropitys can also be found in the state of São Paulo [40] Floresta Fóssil de Teresina near Rio Poti, Piauí, Permian (around 280–270 million years ago). Ecuador – Puyango Petrified Forest – One of the largest collections of petrified wood in the ...
What is petrified wood? The trees in Petrified Forest once were wood but now are are completely crystallized and mostly made of quartz. Millions of years ago, the logs were buried by sediment and ash.
In Petrified Forest National Park, most of the logs in the park retained their original external form during petrification but lost their internal structure. However, a small fraction of the logs and most of the park's petrified animal bones have cells and other spaces that are mineral-filled but still retain much of their original organic ...
Puyango Petrified Forest is a fossil deposit of petrified wood located in the middle basin of the Puyango River, between the Ecuadorian provinces of El Oro and Loja. The area covers 2,658 hectares and its sediments are divided into four geological formations , dating from the late Cretaceous period.
Within most concretions is a mold of an animal and sometimes a plant that is usually marine in origin. [citation needed] When an insect is partly or wholly replaced by minerals, usually completely articulated and with three-dimensional fidelity, is called mineral replication. [12] This is also called petrifaction, as in petrified wood. Insects ...
NBC article about Nick Brandt's photos of petrified animals at Natron lake "Lake Natron, Tanzania". Earth Observatory Newsroom. Archived from the original on 1 October 2006 "East African halophytics". Terrestrial Ecoregions. World Wildlife Fund.