. 2012 Dec 5;2:925. doi: 10.1038/srep00925

Table 1. ChRM mean directions of upper Cuojiangding Group.

Mean direction	N	D_g	I_g	K_g	α_95g	D_s	I_s	K_s	α_95s	Grade
Mean direction of A	31	170.1	19.3	4.4	13.9	170.6	−40.9	8.7	9.3	A
Mean direction of B	38	163.7	18.9	3.3	15.2	166.9	−42.4	6.7	9.7	B
Mean direction of C	33	184.4	30.6	2.8	17.5	189.4	−35.5	3.5	15.2	C
A,B mean direction	69	166.7	19.2	3.8	10.2	168.6	−41.7	7.6	6.7	A+B
A,B,C mean direction	102	170.5	20.4	3.4	8.8	173.6	−41.1	5.7	6.4	A+B+C
*mean direction used*	62	*167.4*	*22.0*	*4.0*	*10.4*	*168.1*	*−42.0*	*7.4*	*7.1*	*A+B no normal polarity samples*

Note: N, number of samples used to calculate mean direction; D_g, I_g (D_s, I_s), directions in geographic (stratigraphic) coordinates; k_g/k_s, best estimate of Fisher's (1953) precision parameter for the mean direction indicating the degree of clustering in geographic/stratigraphic coordinates; α_95g/α_95s, the radius of circle around calculated mean that has 95% chance of true mean lies with it in geographic/stratigraphic coordinates.