Table 2.

Statistical parameters of the RHP values computed across the various geological units of the study area.

Age (Myr)	Rock Units	N	Average Rock density (g/cm3)	Max. ($\mathrm{\mu }\mathrm{W}/m^3$)	Min. ($\mathrm{\mu }\mathrm{W}/m^3$)	mean (x) ($\mathrm{\mu }\mathrm{W}/m^3$)	S.D ($\mathrm{\mu }\mathrm{W}/m^3$)	C.V (%)
Quaternary	AL	08	1.92	1.12 ± 0.00	1.10 ± 0.00	1.11 ± 0.00	0.00	0.39
Tertiary	Bb	12	2.99	2.34 ± 0.12	2.31 ± 0.12	2.32 ± 0.12	0.12	0.51
Tertiary	KK	13	2.24	1.59 ± 0.14	1.10 ± 0.14	1.28 ± 0.14	0.14	11.27
Cretaceous	GS	46	2.85	2.53 ± 0.28	1.68 ± 0.28	2.11 ± 0.28	0.28	13.08
Cretaceous	PS	69	2.40	1.83 ± 0.13	1.45 ± 0.13	1.63 ± 0.13	0.13	8.08
Cretaceous	YL	62	2.32	2.02 ± 0.20	1.41 ± 0.20	1.63 ± 0.20	0.20	12.32
Cretaceous	BS	35	2.29	2.25 ± 0.29	1.40 ± 0.29	1.74 ± 0.29	0.29	16.83
Jurassic	JYG	10	2.61	1.97 ± 0.005	1.96 ± 0.01	1.96 ± 0.01	0.01	0.25
Pan-African	OGe	71	2.64	3.30 ± 0.47	1.79 ± 0.47	2.52 ± 0.47	0.47	18.61
Pan-African	OGp	08	2.64	3.42 ± 0.07	3.28 ± 0.07	3.35 ± 0.07	0.07	2.13
Pan-African	Ch	12	2.64	2.07 ± 0.03	2.00 ± 0.03	2.04 ± 0.03	0.03	1.66
Precambrian	bG	27	2.64	3.25 ± 0.57	1.84 ± 0.57	2.52 ± 0.57	0.57	22.52
Precambrian	MG	09	2.74	3.22 ± 0.00	3.21 ± 0.00	3.21 ± 0.00	0.00	0.13

Note: X, denotes arithmetic means, max. represents maximum value, min. refers to the minimum value, S.D means standard deviations, N is the total number of spatial points (geographic locations) where the same lithology outcropped, C.V denotes coefficient of variability, AL = alluvium, bb = basalts, KK = Keri-Keri Formation, GS = Gombe sandstones, PS = Pindiga Formation, YL = Yolde Formation, BS = Bima sandstones, JYG = ignimbrites, OGe = biotite-hornblende granites, OGp = porphyritic biotite-hornblende granites, Ch = charnokytes, bG = granite-gneiss, and MG = migmatites – gneiss.