Table 4 Radiocarbon results of microbial mats in Lake Untersee, Antarctica.

Sample ID	Depth (mm)	¹⁴C year BP	± 2σ	F¹⁴C	± 2σ	Lab ID
Core 1 (18.5 m depth)
C1-1	2	10,875	37	0.2582	0.0012	UOC-11810
C1-2	4	11,232	38	0.247	0.0012	UOC-11811
C1-3	6	11,731	38	0.2322	0.0011	UOC-11812
C1-4	7	13,072	47	0.1965	0.0011	UOC-11813
C1-5	9	11,541	43	0.2377	0.0013	UOC-11814
C1-6	10	10,921	38	0.2568	0.0012	UOC-11815
C1-7	12	10,222	38	0.2801	0.0013	UOC-11816
C1-8	14	10,569	40	0.2683	0.0013	UOC-11817
C1-9	16	12,045	44	0.2233	0.0012	UOC-11818
C1-10	18	12,617	50	0.2079	0.0013	UOC-11819
C1-15	28	13,119	45	0.1953	0.0011	UOC-11820
C1-19	37	12,737	51	0.2048	0.0013	UOC-11821
C1-22	47	15,034	83	0.1539	0.0016	UOC-11822
C1-26	58	12,751	42	0.2045	0.0011	UOC-11823
C1-30	70	11,437	39	0.2408	0.0012	UOC-11824
C1-33	79	16,307	67	0.1313	0.0011	UOC-11825
C1-34	83	16,729	69	0.1246	0.0011	UOC-11826
C1-35	87	15,950	69	0.1373	0.0012	UOC-11827
C1-36	91	16,032	75	0.1359	0.0013	UOC-11828
C1-37	100	16,208	65	0.133	0.0011	UOC-11829
Core 2 (13 m depth)
C2-1	1	10,052	56	0.2861	0.0020	UOC-9985
C2-5	9	10,882	70	0.2580	0.0022	UOC-9986
C2-8	14	9,510	64	0.3061	0.0024	UOC-9378
C2-9	16	11,268	104	0.2459	0.0032	UOC-9379
C2-12	22	11,113	58	0.2507	0.0018	UOC-9987
C2-19	37	11,481	60	0.2395	0.0018	UOC-9988
C2-24	52	16,567	80	0.1271	0.0012	UOC-9989
C2-29	66	13,040	76	0.1973	0.0018	UOC-9380
C2-30	70	12,031	68	0.2237	0.0018	UOC-9381
Core 3 (17 m depth)
C3-1	1	9,524	48	0.3055	0.0018	UOC-9983
C3-2	3	10,945	82	0.2560	0.0026	UOC-8379
C3-8	11	9,791	58	0.2293	0.0016	UOC-9983
C3-10	14	9,419	76	0.3096	0.0030	UOC-8380
C3-13	17	11,832	58	0.2293	0.0016	UOC-9984
C3-20	30	11,285	80	0.2454	0.0024	UOC-8381
C3-30	42	12,917	78	0.2003	0.0020	UOC-8382
C3-40	53	13,049	90	0.1970	0.0022	UOC-8383
C3-49*	81	19,370	156	0.0009	0.0018	UOC-8384

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