For many decades, wood silicification has been viewed as a relatively simple process of
permineralization that occurs when silica dissolved in groundwater precipitates to fill vacant …

Petrified wood has traditionally been divided into two categories based on preservation
processes: permineralization (where tissues are entombed within a mineral-filled matrix) …

Worldwide, silicified woods are found in many geological formations. Significantly, the
organic materials of wood are no longer dominant; almost all wood fossils have been …

The Zhanguohong agate from Beipiao (Liaoning province, China), which occurs in the
intermediate–felsic volcanic breccias of the Early Cretaceous Yixian Formation, generally …

Silicified wood occurs abundantly in Middle Miocene flows and sedimentary interbeds of the
Columbia River Basalt Group (CRBG) in central Washington State, USA. These fossil …

Central Wyoming, USA, was the site of ancient Lake Gosiute during the Early Eocene. Lake
Gosiute was a large body of water surrounded by subtropical forest, the lake being part of a …

Despite several attempts, the effects of volcanism and greenhouse gas emission on climate
(eg, rainfall) over India across the Cretaceous/Palaeogene Boundary (66.1±0.01 Ma) remain …

Since its discovery in 2008, the opal deposit in the Wegel Tena area of Ethiopia, located
within an Oligocene ignimbritic trap, has become a major provider of precious opal. This …

Una asociación compuesta por 22 leños fósiles fueron recolectados en niveles de areniscas
pertenecientes a la Formación Solari/Botucatú (Jurásico Tardío–Cretácico Temprano) …

Petrified wood samples are found within terrestrial sediments belonging to the Late
Oligocene-Early Miocene Danişmen Formation in Malkara-Keşan located in the southwest …