Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

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.

Locality Name:
Bald Knob, Tehama Co., California, USA

Oldest recorded age at locality: 1.8
Youngest recorded age at locality: 0

mindat Locality ID: 245275
mindat URL: http://www.mindat.org/loc-245275.html

Tectonic Settings:

Total number of sublocalities beneath "Bald Knob, Tehama Co., California, USA": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Carmichael Rock Quarry
Unnamed Placer Au Occurrences (3)

Latitude: 40°2'38"N
Longitude: 121°56'26"W
Decimal Degree (lat, lon): 40.043888888889,-121.94055555556

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	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.

No IMA Minerals occur at this locality according to mindat

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Sample Source	Sample Num	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
NAVDAT-20403	1.8	0.01	0.91+0.89/-0.9	unknown	20403	95983	Carmichael Rock Quarry, Bald Knob, Tehama Co., California, USA	NAVDAT	NAVDAT
NAVDAT-39159	1.188	0.972	1.08±0.108		39159	95983	Carmichael Rock Quarry, Bald Knob, Tehama Co., California, USA	NAVDAT	NAVDAT
NAVDAT-39204	1.5	0	0.75±0.75		39204	95983	Carmichael Rock Quarry, Bald Knob, Tehama Co., California, USA	NAVDAT	NAVDAT

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...