Table 1.

Proposed magnetofossil robustness criteria (Kopp and Kirschvink, 2008).

Context	Criteria
Environment analogous to younger magnetofossil bearing environments;	*S ≥ 3; or
	S ≥ 2 and **C ≥ 3; or
	S ≥ 2 and C ≥ 2 and ***ChP
Paleomagnetic data robust
Environment analogous to younger magnetofossil bearing environments;	S ≥ 3 and ChP; or
	S ≥ 3 and C ≥ 3; or
	S ≥ 3 and C ≥ 2 and ChP
Paleomagnetic data not robust
Environment analogous to younger magnetofossil-bearing environment;	S = 4 and ChP; or
	S ≥ 3 and C ≥ 3 and ChP; or
	S ≥ 3 and C ≥ 2 and ChP and ****CrP
Sediments have undergone burial metamorphism or paleomagnetic data remagnetized
Unique environment	S = 4 and C ≥ 3 and ChP and CrP

^*S, size and shape score;

^**C, chain quality/length score;

^***ChP, chemical perfection criterion;

^****CrP, crystallographic perfection criterion.