Table 2.

Magnetofossils scores of MTB magnetites that had formed in our cultures (Moisescu et al., 2011) at different pH values.

Sample	Stratigraphic context	SD	S	C	ChP	CrP	Age	Robustness	Source
pH 7.0	ND	+	4	3	+	+	NA	Robust	Moisescu et al., 2011
pH 6.0	ND	+	1	2	+	−	NA	Not robust	Moisescu et al., 2011
pH 8.0	ND	+	2	2	+	−	NA	Not robust	Moisescu et al., 2011
pH 9.0	ND	+	2	1	+	−	NA	Not robust	Moisescu et al., 2011
Chalk deposits	*PQ 5	+	2	4	ND	ND	Cretaceous	Robust	Kopp and Kirschvink, 2008
Carbonate platform	ND	+	1	2	ND	ND	Paleoproterozoic	Not robust	Kopp and Kirschvink, 2008

For comparison, two examples of robust or not robust magnetofossil samples were included from the analyses of Kopp and Kirschvink (2008).

ND, not determined; NA, not applicable;

^*paleomagnetic quality index.