The Mineral Evolution database is currently under development.
The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.
This mineral is using an age reported as an element mineralization period.
O
This mineral is using an age calculated from all data at the locality.
R
The age displayed for this mineral originates from a different, non-child locality.
P
The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.
This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.Elements at this locality, including sub-localities: AlAsAuBaCCaClCrCuFFeHHgKMgNaOPbSSbSiTiUVZnElements from minerals reported directly at this locality: Al H K O Si Structural Groups for minerals in this locality:
Birch Creek low-silica rhyolite lava. It is the first rhyolitic unit to erupt in the region. 150 m high exposures of flow banded, devitrified, tan lava in cliffs near Birch Creek Campground. Of the Rooster Comb Caldera.
Michelle_790
See Table 2. "Tuff of Leslie Gulch". Unit Type described as "Outflow Tuff", of the Rooster Comb Caldera. "The Tuff of Leslie Gulch is a sparsely porphyritic, weakly peralkaline, alkali rhyolite containing phenocrysts of sodic sanidine and sparse quartz and oxidized mafic phases."
Michelle_796
See Table 2. "Three Fingers Rock rhyolite dome", it is also referred to as a rhyolite plug
Michelle_797
See Table 2. "Perlitic intrusion exposed in Leslie Gulch".
Michelle_801
The Sucker Creek Formation consists mainly of lacustrine volcaniclastic rocks and tuff, deposited in a moist temperate lowland climate. Strata are exposed locally along Succor Creek and are among the oldest strata deposited in the Owyhee River region.
Age of rhyolite flow. "Our new 40Ar/39Ar age of 16.8 ± 1.1 Ma on plagioclase from the Birch Creek low-silica rhyolite lava (sample TB-278A in Table 2) is of such low precision that it does not establish conclusively that this unit is older than the 15.81 Ma Tuff of Leslie Gulch."