tag:blogger.com,1999:blog-1228690739485734684.post3943073624844982130..comments2024-03-28T00:46:01.084+00:00Comments on Stonehenge and the Ice Age: Deglaciation of the Wicklow HillsBRIAN JOHNhttp://www.blogger.com/profile/00413447032454568083noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-1228690739485734684.post-53906361824420861972018-09-12T19:11:54.948+01:002018-09-12T19:11:54.948+01:00Jon -- lucky I spotted this one! Most Anon posts ...Jon -- lucky I spotted this one! Most Anon posts get spammed......... No, I haven't touched anything. But I suspect Blogger is up to something at the moment, following lots of complaints. I am still not getting Email notifications of comments when they come in. Hope it all settles down again........BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-48977275107470019462018-09-12T18:21:12.036+01:002018-09-12T18:21:12.036+01:00That's an odd looking scale on the Schmidt ham...That's an odd looking scale on the Schmidt hammer (got one in the cupboard). It does determine strength but surface strength might be degraded by exposure (though I guess that would depend on the type of rock)<br /><br />Was in Wicklow week before last. From Arklow (which is low down) you can see Snowdon on a clear day (looks like a ship I'm told) so should be easy to see the top of the Wicklow hills if you go up to Preseli mountains.<br /><br />PS something about your site has changed. Can't post using a blogger account.<br /><br />JonAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-14175507070887941832018-09-10T17:56:17.050+01:002018-09-10T17:56:17.050+01:00.... quarryman ------- but maybe Phil's mothe....... quarryman ------- but maybe Phil's mother was into quarrying too.......BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-86132632663690396762018-09-10T17:55:08.987+01:002018-09-10T17:55:08.987+01:00Phil will probably know! Maybe this is an essenti...Phil will probably know! Maybe this is an essential quarryma's tool......... As I understand it, granite is perfect because the surface actually rots away during exposure to the atmosphere, sunlight and water. Salt too, I assume. The end product is the grus that we see in many granite landscapes. I assume that the original fresh and hard surface gradually softens over time, and that somebody has worked out a calibrated scale for how this translates into "exposure age"........ have written to one of the authors of the paper, to find out more.BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-81464767992352221822018-09-10T14:23:05.697+01:002018-09-10T14:23:05.697+01:00How does the Schmidt hammer work in determining ex...How does the Schmidt hammer work in determining exposure age? Surely it is only giving a figure for the 'strength' of the rock which must be the result of many other factors. I suppose a survey would indicate a range of results for rocks which be similar or dissimilar to a greater or lesser amount, but surely this is governed by the geological origin of the material.<br /><br />Or do you find similar rocks and then show that there is some differnce between them.<br /><br />DaveDave Maynardhttps://www.blogger.com/profile/14162915474983638825noreply@blogger.com