. 2023 Mar 6;13(3):714. doi: 10.3390/life13030714

Table 3.

Isotopic composition of the structural regions identified in the tertiary layer of Gigantoproductus shells and poorly preserved areas. Bold highlights the mean of each structural part.

Shell Region	δ¹⁸O	δ¹³C	⁸⁷Sr/⁸⁶Sr (Std Err)	M.S.D.	Shell Region	δ¹⁸O	δ¹³C	⁸⁷Sr/⁸⁶Sr (Std Err)	M.S.D.	Shell Region	δ¹⁸O	δ¹³C	⁸⁷Sr/⁸⁶Sr (Std Err)	M.S.D.
Umbornal	−3.4	2.78			Thin	−2.91	3.35	0.70786
	−3.61	2.35				−2.77	3.41	(4⁻⁶)		Poorly preserved	−3.71	1.84
	−3.78	2.39				−3.13	3.29	0.707845			−2.86	4.27
	−3.55	2.68				−2.99	2.95	(4⁻⁶)			−5.06	3.62	0.707893
	−3.25	2.52				−2.93	3.15				−4.12	3.68	(4⁻⁶)
	−3.14	2.97				−2.33	3.04				−2.32	3.87
	−3.27	2.81				−2.44	3.17				−6.28	3.08
Mean	−3.43	2.64		0.22/0.23		−2.34	3.38				−4.37	1.18
Thick	−2.82	2.18	0.70783			−2.54	3.29				−1.64	3.05
	−3.39	2.1	(4⁻⁶)			−2.27	2.89				−1.89	3.76
	−2.62	2.25			Mean	−2.67	3.19		0.32/0.18		−3.87	3.3	0.707807
	−2.92	2.29			Dorsal Valve	−3.25	2.49				−2.16	2.61	(5⁻⁶)
	−2	3.09				−4.02	1.54				−2.14	2.43
	−2.58	3.04				−1.46	3.56				−1.83	3.46
	−2.33	2.96	0.707831			−3.13	2.13				−4.03	3.34
	−2.32	2.94	(4⁻⁶)		Mean	−2.97	2.43		1.08/0.85	Mean	−3.31	3.11		1.4/0.84
	−2.71	2.86
Mean	−2.63	2.63		0.40/0.42

M.S.D. Mean standard deviation; Std Err: Standard deviation error.