Sample J87-67

NavDat sample number 30637

Sample

Sample ID	J87-67
Rock type	VOLCANIC
Material	IGNEOUS

Location

Latitude	30.6
Longitude	-103.917
Location	Davis Mtns
State / province	TEXAS
Formation	Barrel Springs Fm

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
36.6		32.94	40.26

Analyses

MINERAL

Item	Value	Std. dev.	Unit	Method
PB206_PB204	17.703			TIMS
PB207_PB204	15.452			TIMS
PB208_PB204	37.601			TIMS

References

James, Eric William; Henry, Christopher D (1993) Southeastern extent of the North American Craton in Texas and northern Chihuahua as revealed by Pb isotopes; with Suppl. Data 9310. Geological Society of America Bulletin, vol.105, no.1, pp.116-126, Jan 1993 doi:10.1130/0016-7606(1993)105<0116:SEOTNA>2.3.CO;2