Table 2.

Samples used in Gilmour et al. (2009) absolute age normalization of the I–Xe chronometer and their respective I–Xe (relative to Shallowater) and U-ratio corrected Pb–Pb ages. I–Xe age of HH 237 chondrule #1 studied here and respective Pb–Pb ages for HH 237 silicates and Gijba chondrules are shown in a last row.

	I–Xe age, Ma			Pb–Pb age, Ma
Earliest chondrules	Swindle et al. (1991a)	Chainpur, LL3.4	4.3 ± 0.6	Amelin and Krot (2007)	Allende, CV3	4565.6 ± 1.0
	Swindle et al. (1991b)	Semarkona, LL 3.0
Richardton, H4	Pravdivtseva et al. (1998)	Pyroxene	1.1 ± 2.0	Amelin (2001)	Pyroxene	4560.3 ± 0.6
	Gilmour et al. (2006)	Chondrule 2	−0.1 ± 0.1	Gilmour et al. (2006)	Chondrule 2	4561.5 ± 0.8
		Chondrule 6	−4.1 ± 0.6		Chondrule 6	4557.3 ± 1.4
Acapulco	Brazzle et al. (1999)	Feldspar	−3.8 ± 1.5	Göpel et al. (1994)	Phosphate	4556.2 ± 1.0
Ste Marguerite, H4	Brazzle et al. (1999)	Feldspar	0.7 ± 0.4	Göpel et al. (1994)	Phosphate	4561.8 ± 0.3
Kernouve, H6	Brazzle et al. (1999)	Phosphate	−43 ± 6	Göpel et al. (1994)	Phosphate	4521.6 ± 0.7
HH 237, CB	This work	Chondrule	−0.29 ± 0.16	Krot et al. (2005)	HH 237 silicates	4561.9 ± 0.9
				Bollard et al. (2015)	Gujba chondrules	4562.5 ± 0.2