tag:blogger.com,1999:blog-1228690739485734684.post8700873659807035090..comments2024-03-28T14:00:12.372+00:00Comments on Stonehenge and the Ice Age: Llangolman gravel pit -- Anglian fluvio-glacial gravels?BRIAN JOHNhttp://www.blogger.com/profile/00413447032454568083noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-1228690739485734684.post-15670691249574134702015-04-24T21:06:46.007+01:002015-04-24T21:06:46.007+01:00So it's the "rotten stones" that giv...So it's the "rotten stones" that give the age away. Can stones rot "young"? Under various degrading environments?<br /><br />You write,<br /><br /><i>"the coherent stones might well survive to fight again another day, but the rotten stones would very quickly be destroyed"</i>.<br /><br />Too wise for words!<br /><br />KostasConstantinos Ragazasnoreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-65968034197219300132015-04-24T19:55:09.924+01:002015-04-24T19:55:09.924+01:00Fluvio-glacial gravels will always have the same s...Fluvio-glacial gravels will always have the same sedimentary characteristics, related to load available, stream flow dynamics, gradient, particle sizes etc. The key thing we find at Llangolman is the degree of rotting of the included stones -- quite unlike that of the gravel pits near Cardigan. If an old fluvio-glacial deposit, from the Anglian, was to be redistributed following a new ice advance, the coherent stones might well survive to fight again another day, but the rotten stones would very quickly be destroyed during transport. I would guess that many would be destroyed pretty well instantly. Then we would have a Devensian deposit consisting of fresh-looking stones of many different ages and origins....BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-35895658728335264652015-04-24T19:17:48.888+01:002015-04-24T19:17:48.888+01:00Brian,
I hesitate asking you this. But it's b...Brian,<br /><br />I hesitate asking you this. But it's been in my mind for awhile now! So I will!<br /><br />What distinguishes Anglian gravel from Devensian? Is it "stratigraphy" or is it "lithology"?<br /><br />If Anglian gravel get redeposited by Devensian glaciers and meltwater, is it still "Anglian"? Or Devensian!<br /><br />KostasConstantinos Ragazasnoreply@blogger.com