Table 1.

N₀ initial authigenic ¹⁰Be/⁹Be ratio calculation from four Holocene Lake Mega-Chad diatomite samples

Sample	S. unit	Age	Lithology	Sample depth,* m	Natural [10Be]/[9Be],† ×10−8
TOD1	Lacustrine	Holocene	Diatomite	0.20	2.72 ± 0.25
TOD1	Lacustrine	Holocene	Diatomite	0.30	2.46 ± 0.14
TOD2	Lacustrine	Holocene	Diatomite	1.00	2.66 ± 0.16
TOD2	Lacustrine	Holocene	Diatomite	2.40	2.44 ± 0.19

S., sedimentary.

*Mean square of the weighted deviate, 0.55.

^†Weighted mean ± SD: 2.54 × 10⁻⁸ ± 8.75 × 10⁻¹⁰; N₀, 2.54 × 10⁻⁸ ± 0.09 × 10⁻⁸.