Sample E90-18

NavDat sample number 30669 · TRACHYTE

Sample

Sample ID	E90-18
Rock name	TRACHYTE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS

Location

Latitude	29.5167
Longitude	-104.117
Location	Boffecillos Mountains
State / province	TEXAS
Formation	Rawls Fm Mbr 5

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
28		25.2	30.8

Analyses

MINERAL

Item	Value	Std. dev.	Unit	Method
PB206_PB204	18.098			TIMS
PB207_PB204	15.517			TIMS
PB208_PB204	37.941			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