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:
Havre, Hill Co., Montana, USA

Oldest recorded age at locality: 83.6
Youngest recorded age at locality: 72.1

mindat Locality ID: 30928
mindat URL: http://www.mindat.org/loc-30928.html

Tectonic Settings:

Total number of sublocalities beneath "Havre, Hill Co., Montana, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 48°33'0"N
Longitude: 109°41'"W
Decimal Degree (lat, lon): 48.55,-109.68333333333

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.

Aragonite	Calcite	Gypsum	None	Oxalate

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 Ca H O S

Elements from minerals reported directly at this locality: C Ca H O S

Structural Groups for minerals in this locality:
Aragonite Calcite Gypsum None Oxalate

4 IMA Minerals at location:

Aragonite ()*	Calcite ()*	Gypsum ()*	Whewellite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Aragonite ()*	Aragonite	Ca(CO₃)	83.6	72.1	3250
Calcite ()*	Calcite	Ca(CO₃)	83.6	72.1	27770
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	83.6	72.1	6890
Whewellite ()*	Oxalate	Ca(C₂O₄)·H₂O	83.6	72.1	66

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_574	Whewellite, calcium oxalate monohydrate, has been found as a crystal perched on terminated' unetched, drusy calcite crystals in a septarian limestone concretion in the marine Bearpaw shale of late cretaceous age near Havre, Montana.

1 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Michelle_574	83.6	72.1	Campanian	stratigraphy	Age of Bearpaw Shale	high						Whewellite		30928	Havre, Hill Co., Montana, USA	Havre	Pecora and Kerr (1954)		AM39_208	Age of Bearpaw Shale, containing the limestone concretions in which whewellite has been found.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...