Sample Ra 7 lp 1

NavDat sample number 30668 · TRACHYTE

Sample

Sample ID	Ra 7 lp 1
Rock name	TRACHYTE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	QUARTZ TRACHYTE

Location

Latitude	29.3917
Longitude	-103.958
Location	Boffecillos Mountains
State / province	TEXAS
Formation	Rawls Fm Mbr 7

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
27.3		24.57	30.03

Analyses

MINERAL

Item	Value	Std. dev.	Unit	Method
PB206_PB204	18.043			TIMS
PB207_PB204	15.509			TIMS
PB208_PB204	37.819			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