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It seems to me that the Hiwatha crater may be filled with Eemian ice (that is ice laid down before the last ice age) and so it would be at least around 100 ka old, and certainly older than the Younger Dryas).

see for example the radar maping of ice in this video from around 1 min 30 onwards [www.youtube.com]

Jonny

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Subject Views Written By Posted
Interglacials 1200 syvreta 21-Feb-19 11:00
Re: Interglacials 144 D-Archer 21-Feb-19 16:12
Re: Interglacials 127 Aine 21-Feb-19 16:16
Re: Interglacials 125 D-Archer 22-Feb-19 09:52
Snowball or Slushball Earth 124 Race Jackson 22-Feb-19 20:29
Re: Interglacials 92 ianw16 25-Feb-19 21:15
Re: Interglacials 84 D-Archer 26-Feb-19 10:59
Re: Interglacials 88 ianw16 26-Feb-19 11:06
Re: Interglacials 76 D-Archer 27-Feb-19 16:12
Re: Interglacials 76 ianw16 28-Feb-19 14:37
Re: Interglacials 70 D-Archer 01-Mar-19 12:29
Re: Interglacials 71 ianw16 01-Mar-19 13:36
Re: Interglacials 73 ianw16 01-Mar-19 13:46
Re: Interglacials 68 D-Archer 02-Mar-19 09:52
Re: Interglacials 80 ianw16 02-Mar-19 11:20
Re: Interglacials 23 jamesglory 23-Apr-19 23:55
Re: Interglacials 19 D-Archer 24-Apr-19 15:27
Re: Interglacials 20 ianw16 24-Apr-19 15:35
Re: Interglacials 18 D-Archer 24-Apr-19 16:01
Re: Interglacials 135 Aine 21-Feb-19 16:12
Re: Interglacials 105 Susan Doris 23-Feb-19 13:19
Re: Interglacials 82 Aine 27-Feb-19 12:12
Re: Interglacials 83 ianw16 01-Mar-19 15:04
Re: Interglacials 80 Aine 01-Mar-19 18:41
Re: Interglacials 74 ianw16 01-Mar-19 19:47
Re: Interglacials 46 sunny_eyes 06-Apr-19 08:08
Re: Interglacials 49 Race Jackson 07-Apr-19 06:17
Re: Interglacials 78 D-Archer 07-Apr-19 08:48
Re: Interglacials 54 ianw16 07-Apr-19 11:41
Re: Interglacials 35 D-Archer 22-Apr-19 08:51
Re: Interglacials 35 ianw16 22-Apr-19 10:28
Re: Interglacials 24 D-Archer 23-Apr-19 11:08
Re: Interglacials 26 D-Archer 23-Apr-19 11:08
Re: Interglacials 31 jamesglory 23-Apr-19 23:58
Re: Interglacials 23 D-Archer 24-Apr-19 15:29
Re: Interglacials 18 ianw16 24-Apr-19 15:38
Re: Interglacials 22 D-Archer 24-Apr-19 16:00
Re: Interglacials 24 ianw16 24-Apr-19 16:16
Re: Interglacials 20 D-Archer 25-Apr-19 08:51
Re: Interglacials 50 ianw16 07-Apr-19 11:38
Re: Interglacials 69 JonnyMcA 09-Apr-19 09:17
Re: Interglacials 49 Archaic 25-Apr-19 19:07


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