Talk:Ice Age traces

Ra – 11,000 AD?

SF map on commons

Was Ra formed in the future? I assume this is meant to be either BP or BCE, but which one? w:sv:Mellansvenska israndzonen (is that about the same moraine?) says 800 years about 12,000 BP. –LPfi (talk) 07:33, 8 November 2022 (UTC)

Ooops, should be BC. Thanks. I am not absolutly sure that the Ra and Mellansvenske are the same, but I guess. Norwegian WIkipedia says so: "Mellomsvenske israndavsetninger er glasiale avsetninger tilsvarende Ra-trinnet i Norge. etc" Erik den yngre (talk) 15:09, 8 November 2022 (UTC)

I assume the times when the glacier shrank and expanded where the same in Finland, Sweden and Norway, so the ages should correspond, although some periods may have left clearer traces in some regions (there seem to be four major terminal moraines in Finland, two of which are clear only in parts of their extent). –LPfi (talk) 16:00, 8 November 2022 (UTC)

Geologists call this the Ra-stage (Ra-trinnet), visible across Fennoscandia:

Tidlig i Yngre Dryas perioden (12800 – 11700 år siden) skjedde det imidlertid en kraftig klimaforverring og brefronten rykket flere kilometer fram. Dette var nok den mest markerte hendelsen under avslutningen av siste istid, og den har satt sine tydelige spor; Moreneryggene og israndavsetningene som i denne perioden ble dannet foran innlandsisen rundt hele Fennoskandia er trolig verdens tydeligste og mest markerte «monument» fra istidene (https://www.statsforvalteren.no/siteassets/utgatt/utgatt---blokker-aust-agder/dokument-fmaa/miljo-og-klima/raet-nasjonalpark/geologirapport-raet-uten-vedlegg.pdf).

Translated: "The world's most visible and notable monument from the iceages". Erik den yngre (talk) 09:12, 9 November 2022 (UTC)