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:
Rob Rollo Mine, Maybell District, Moffat Co., Colorado, USA

Oldest recorded age at locality: 23.03
Youngest recorded age at locality: 5.3

mindat Locality ID: 116261
mindat URL: http://www.mindat.org/loc-116261.html

Tectonic Settings:

Total number of sublocalities beneath "Rob Rollo Mine, Maybell District, Moffat Co., Colorado, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 40°32'53"N
Longitude: 107°59'48"W
Decimal Degree (lat, lon): 40.548055555556,-107.99666666667

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.

Fluorite	None

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: O U

Elements from minerals reported directly at this locality: O U

Structural Groups for minerals in this locality:
Fluorite None

1 IMA Minerals at location:

Uraninite ()*

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
Uraninite ()*	Fluorite	UO₂	23.03	5.3	0		2718

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Giersdorf_00000809	Economic ore deposits of the Maybell area are found in the uppermost sandstone unit of the Browns Park Formation. The uranium ore deposits are described as tabular, amoeba-shaped lenses of discontinuous bodies within limited stratigraphic intervals.

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
	Giersdorf_00000809	23.03	5.3	23.03-5.3		The Browns Park formation is dated to be Miocene in age and is applied to the uranium mineralization within it.					Yes		Autunite, Becquerelite, Carnotite, Coffinite, Liebigite, Schoepite, Torbernite, Tyuyamunite, Uraninite, Zeunerite	U	133365	Maybell District, Moffat Co., Colorado, USA	Maybell Mining District	Chenoweth (1986)		NINCG_289	In the Maybell area, the Browns Park formation unconformably overlies truncated rocks ranging In age from Precambrian to Eocene, on the north flank of the Axial Basin anticline. The Browns Park formation is dated to be Miocene in age.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...