Feb 15, 2012. Sigleo, Anne (1978). Organic geochemistry
wood, Petrified Forest National
Park, Arizona. Arizona. pp. 1397–1405...
- such as holes bored
and that this becomes silicified
. This hypothesis certainly explains
the complex shapes
- diagenetic cherty
nodules, and stromatolitic limestone
and is intensively silicified
. The hydrothermal
alteration, which created
this breccia, has been dated...
- it is more readily exposed
by erosion. Petrified
wood is often heavily silicified
(the organic material replaced
dioxide), and the impregnated...
- conditions. The intra-volcanic rocks comprise silicified mudstone interfingered
with diatomites. The term ‘silicified
to the fact that the calcium
- often deposited around larger fossils
such as Echinoidea which
may be silicified
(i.e. replaced molecule
by flint). Chalk, as seen in Cretaceous...
(Frasnian, ca. 374 Ma) silicified fossil cladoxylopsid
(diameter up to c.70 cm) with preserved...
- Hill, California
"Ocean Jasper" (not, strictly, a jasper, but a highly silicified rhyolite
or tuff) Analalava District
- official state
rock is bituminous
coal, and the official state gemstone
is silicified Mississippian fossil Lithostrotionella
coral. The limestone
sur les végétaux silicifiés
d'Autun, 1876 – Research
on the silicified flora
of Autun. Végétaux silicifiés
d'Autun et de Saint-Etienne. Nouvelles...