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:
Venado, Coast Range, Sonoma Co., California, USA

Oldest recorded age at locality: 164
Youngest recorded age at locality: 164

mindat Locality ID: 228935
mindat URL: http://www.mindat.org/loc-228935.html

Tectonic Settings:

Total number of sublocalities beneath "Venado, Coast Range, Sonoma Co., California, USA": 22
Total number of bottom-level sublocalities: 20

Number of Child Localities: 19
Child Localities:
Austin Creek State Recreation Area
East Fork Big Austin Creek
Gilliam Creek
Grizzly Cu Occurrence
Henry Doelger Occurrence
Madeira Claim
Madeira Deposit (Healdsburg Marble Company)
Norton Ranch Occurrence
Red Side Occurrence
Rough Crossing Claim
Sonoma Magnesite Mine (Sonoma Magnesite Property; Red Slide Mine)
Unnamed Cr Prospect (10)
Unnamed Cu Occurrence (2)
Unnamed Hg Prospect (11)
Unnamed Hg Prospect (5)
Unnamed Magnesite Occurrence (2)
Unnamed Mn Prospect (5)
Ward Tract
Welch Prospect

Latitude: 38°36'47"N
Longitude: 123°1'37"W
Decimal Degree (lat, lon): 38.613055555556,-123.02694444444

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.

Calcite	None	Spinel

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: C Cr Fe H Mg O

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Calcite None Spinel

3 IMA Minerals at location:

Chromite ()*	Magnesite ()*	Nesquehonite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	164	164	3	180299,180303,180312	3902
Magnesite ()*	Calcite	Mg(CO₃)			8	180292,180293,180296,180300,180301,180302,180304,180309	1487
Nesquehonite ()*	None	Mg(CO₃)·3H₂O			1	180294	80

3 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
podchrome-00342	164	164	Middle Jurassic (161-168 Ma)	Cr	95720	Madeira Claim, Venado, Coast Range, Sonoma Co., California, USA	Madeira Claim	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00343	164	164	Middle Jurassic (161-168 Ma)	Cr	95763	Rough Crossing Claim, Venado, Coast Range, Sonoma Co., California, USA	Rough Crossing SE	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00345	164	164	Middle Jurassic (161-168 Ma)	Cr	95844	Welch Prospect, Venado, Coast Range, Sonoma Co., California, USA	Welch Prospect	Moiser et al. (2012)	USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...