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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 1921 syvreta 21-Feb-19 11:00
Re: Interglacials 243 D-Archer 21-Feb-19 16:12
Re: Interglacials 215 Aine 21-Feb-19 16:16
Re: Interglacials 187 D-Archer 22-Feb-19 09:52
Snowball or Slushball Earth 189 Race Jackson 22-Feb-19 20:29
Re: Interglacials 164 ianw16 25-Feb-19 21:15
Re: Interglacials 151 D-Archer 26-Feb-19 10:59
Re: Interglacials 158 ianw16 26-Feb-19 11:06
Re: Interglacials 141 D-Archer 27-Feb-19 16:12
Re: Interglacials 141 ianw16 28-Feb-19 14:37
Re: Interglacials 132 D-Archer 01-Mar-19 12:29
Re: Interglacials 131 ianw16 01-Mar-19 13:36
Re: Interglacials 132 ianw16 01-Mar-19 13:46
Re: Interglacials 118 D-Archer 02-Mar-19 09:52
Re: Interglacials 135 ianw16 02-Mar-19 11:20
Re: Interglacials 85 jamesglory 23-Apr-19 23:55
Re: Interglacials 77 D-Archer 24-Apr-19 15:27
Re: Interglacials 78 ianw16 24-Apr-19 15:35
Re: Interglacials 78 D-Archer 24-Apr-19 16:01
Re: Interglacials 220 Aine 21-Feb-19 16:12
Re: Interglacials 165 Susan Doris 23-Feb-19 13:19
Re: Interglacials 147 Aine 27-Feb-19 12:12
Re: Interglacials 154 ianw16 01-Mar-19 15:04
Re: Interglacials 135 Aine 01-Mar-19 18:41
Re: Interglacials 128 ianw16 01-Mar-19 19:47
Re: Interglacials 113 sunny_eyes 06-Apr-19 08:08
Re: Interglacials 111 Race Jackson 07-Apr-19 06:17
Re: Interglacials 130 D-Archer 07-Apr-19 08:48
Re: Interglacials 107 ianw16 07-Apr-19 11:41
Re: Interglacials 86 D-Archer 22-Apr-19 08:51
Re: Interglacials 87 ianw16 22-Apr-19 10:28
Re: Interglacials 74 D-Archer 23-Apr-19 11:08
Re: Interglacials 78 D-Archer 23-Apr-19 11:08
Re: Interglacials 80 jamesglory 23-Apr-19 23:58
Re: Interglacials 74 D-Archer 24-Apr-19 15:29
Re: Interglacials 67 ianw16 24-Apr-19 15:38
Re: Interglacials 71 D-Archer 24-Apr-19 16:00
Re: Interglacials 73 ianw16 24-Apr-19 16:16
Re: Interglacials 68 D-Archer 25-Apr-19 08:51
Re: Interglacials 107 ianw16 07-Apr-19 11:38
Re: Interglacials 48 Race Jackson 03-Jun-19 19:03
YD & glacial 66 hendrik dirker 06-Jun-19 08:56
Gremlins in the works 96 hendrik dirker 06-Jun-19 14:31
Re: Interglacials 129 JonnyMcA 09-Apr-19 09:17
Re: Interglacials 122 Archaic 25-Apr-19 19:07
Re: Interglacials 59 hendrik dirker 03-Jun-19 13:31


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