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:
Elk Creek Locality, Dalzell, Meade Co., South Dakota, USA

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

mindat Locality ID: 5751
mindat URL: http://www.mindat.org/loc-5751.html

Tectonic Settings:

Total number of sublocalities beneath "Elk Creek Locality, Dalzell, Meade Co., South Dakota, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 0°0'0"N
Longitude: 0°0'0"E
Decimal Degree (lat, lon): 0,0

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.

Baryte	Calcite	Gypsum	Marcasite	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: Ba C Ca Fe H O S

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

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

5 IMA Minerals at location:

Baryte ()*	Calcite ()*	Gypsum ()*	Marcasite ()*	Whewellite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Baryte ()*	Baryte	Ba(SO₄)	83.6	72.1	11547
Calcite ()*	Calcite	Ca(CO₃)	83.6	72.1	27770
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	83.6	72.1	6890
Marcasite ()*	Marcasite	FeS₂	83.6	72.1	5674
Whewellite ()*	Oxalate	Ca(C₂O₄)·H₂O	83.6	72.1	66

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_575	Concretions bearing whewellite are found in the Gregory Member of the Pierre Shale, Meade County, South Dakota . They have been reported at Elm Springs, Elk Creek and along the Cheyenne River. Concretions are described as septarian limestone and often fossiliferous, from 30 cm to a few meters in diameter.

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_575	83.6	72.1	Campanian	stratigraphy	Age of the Gregory Member of the Pierre Shale	high				Yes		Whewellite		4116	Meade Co., South Dakota, USA	Meade County	Campbell and Roberts (1986)		MR17_131	Age of the Gregory member of the Cretaceous Pierre shale (from Hanczaryk & Gallagher (2007)).

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...