Age and growth dynamics of Tyrannosaurus rex Author Horner, John R. Author Padian, Kevin text Proceedings of the Royal Society, Series B 2004 2004-08-17 271 1875 1880 journal article 10.1098/rspb.2004.2829 eab7f5e2-fead-415f-98c1-0e26d8fcade9 3726770

Table 1. Specimens of Tyrannosaurus rex analysed in this study. (Specimen numbers are from the MOR, with catalogue numbers of labelled thin sections; tib, tibia; fem, femur; fib, fibula; L, length of bone (mm); C, circumference of bone (mm); Tcor, total cortical thickness; Tlag, cortical thickness with LAGs preserved; Tnon, cortical thickness without LAGs preserved; MR, medullary radius (marrow cavity from which bone has been eroded) = total radius minus cortical thickness; actual LAGs, number of LAGs that could be counted in Tlag; retroc LAGs, number of LAGs retrocalculated for Tnon. Methods of calcu- lation: (i) mean; (ii) maximum; (iii) penultimate; (iv) parabolic; and (v) incremental; for explanation see § 2.)

specimen	section	L	C	Tcor	Tlag	Tnon	MR	actual LAGs	retroc LAGs	calibrated age methods of calculation and overall age estimates
009 tib	TI- 1 - C	1070	404	16	16	0	35	4	10 –11	14– 15 ± 1 (i), 8 – 10 (ii), 10 – 12 (iii) + 11 – 12
009 tib	TI- 1 - D	1070	404	20	20	0	45	3	10 –11	13 – 14 ± 1 (i), 9 – 11 (ii), 13 – 15 (iii) + 11 – 12
555 tib	TI- 1 a	1200	ca. 500	26	26	0	43	7	4 – 14	11 – 12 (ii), 14 (iii), 16– 18 (iv) + 14 ± 2
555 tib	TI- 1 b	1200	ca. 500	27	27	0	43	7	4 – 14	11 – 12 (ii), 14 (iii), 16– 18 (iv) + 14 ± 2
1125 fem	Fe 1- L 2- B2 a	1070	433	30	14	16	46	4	9 – 11	15 – 17 (i)
1125 fem	Fe 1- L 2- B2 b	1070	433	22	12	10	38	7	10 – 15	17 – 18 (v), 20 –22 (ii) + 18 ± 2
1156 tib	T 2 -1	—	—	38	18	20	—	7	—	—
1156 tib	T3 - 1	—	—	43	11	32	—	7	—	—
1198 tib	Fe- 1 -B- 1	—	—	44	22	22	—	10	3 – 4	—
1198 tib	Fe- 1 - A- 1	—	—	29	29	0	—	8	—	—
1128 tib	TI- 1	1120	464	26	26	0	44	6 – 7	4 – 13	11 – 12 (v), 14 – 16 (ii), 18 – 20 (iii), 20 – 21 (i) + 16 ± 5
1128 tib	TI- 2	1120	464	26	26	0	44	6 – 7	4 – 13	11 – 12 (v), 14 – 16 (ii), 18 – 20 (iii), 20 – 21 (i) + 16 ± 5
1152 fem	LBF2 -1	—	—	44	22	22	—	10	3 – 4	—
1152 fem	F 2 - 1	—	—	41	26	15	—	10	2 – 3	—
1152 fib	Fi- 2	—	—	22	11	11	1	‡ 17	5– 10	24– 25(ii), 27 (iii), 22 (v) + 25 ± 2