Table 1 Grain size, radiocarbon and stable isotope data of CCC samples from Mörkgletscher (arranged according to depth, where 0 cm is the base of the ice in a drill core 1.9 m below the ice floor), as well as of two samples of experimentally formed CCC from Eispalast (L1-1, L2-2) and two CCC samples from Eispalast (F320) and Eistunnel (ETB).

Sample	Distance from base (cm)	Grain size (median, µm)	Lab no	Age (BP)	Error (±)	Age_corr (BP)	Age_corr (cal BP) 2 sigma	δ¹³C (‰)	δ¹⁸O (‰)
M-G3a*	1179	54	45,085	1369	19	948	918-792	9.51	− 9.35
M-G3b*	1179	54	45,780	1472	21	1051	1052-918
M-G2	1149	56	45,084	1293	20	872	901-695	11.36	− 7.43
M-G1a*	1069	199	45,083	921	18	500	544-505	11.06	− 7.20
M-G1b*	1069	199	45,779	1012	18	591	646-542
M-X20	487	44	43,296	1755	27	1334	1303-1177	13.25	− 5.35
M-G20	365	55	52,759	3004	26	2583	2760-2521	12.31	− 5.77
M-14	338		38,062	2480	22	2059	2105-1934	10.41	− 7.53
M-128	297	121	39,708	2501	26	2080	2124-1943	10.78	− 6.96
M-B**	247		38,060	3311	32	2890	3158-2885	10.93	− 6.32
M-A20**	247	58	43,295	2920	22	2499	2725-2471	10.60	− 6.59
M-55	224	40	43,293	3292	45	2871	3155-2868	9.81	− 7.21
M-25	194	54	39,707	3105	29	2684	2852-2749	9.69	− 6.87
M-E154-156a*	36		45,086	3363	23	2942	3207-2969	10.78	− 6.75
M-E154-156b*	36		45,781	3517	24	3096	3378-3226
L1-1	–		47,410	356	20			2.32	− 18.50
L2-2	–		50,858	511	19			− 1.19	− 19.99
F320			45,088	3955	23	3534	3898-3699	9.04	− 8.62
ETB			43,299	1046	20	625	653-553	15.50	− 5.24

Three types of radiocarbon data are reported: conventional, corrected for the dead carbon effect, and corrected for the dead carbon effect and calibrated to calendar ages (see text).
*Duplicates analyzed from the same sample. **Taken laterally from the same CCC layer.

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