Plantguy Posted April 20, 2019 Share Posted April 20, 2019 Hey Roger, glad to see the latest and hear your back in business...what is the matrix...looks like an oolitic? rich type limestone? of sorts...seems to leave an interesting texture/mini perforations in some of the specimens. Does that cause any special prep procedures? more work? Regards, Chris Link to comment Share on other sites More sharing options...
Ludwigia Posted April 20, 2019 Author Share Posted April 20, 2019 On 15.4.2019 at 11:51 AM, Monica said: Congratulations on the awesome ammonites - especially the Cadoceras specimens!!! Thanks Monica Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Wrangellian Posted April 20, 2019 Share Posted April 20, 2019 4 hours ago, Plantguy said: Hey Roger, glad to see the latest and hear your back in business...what is the matrix...looks like an oolitic? rich type limestone? of sorts...seems to leave an interesting texture/mini perforations in some of the specimens. Does that cause any special prep procedures? more work? Regards, Chris I was wondering the same thing. It looks like some or all of the shell in some cases was dissolved away at some point. Link to comment Share on other sites More sharing options...
Ludwigia Posted April 20, 2019 Author Share Posted April 20, 2019 4 hours ago, Plantguy said: Hey Roger, glad to see the latest and hear your back in business...what is the matrix...looks like an oolitic? rich type limestone? of sorts...seems to leave an interesting texture/mini perforations in some of the specimens. Does that cause any special prep procedures? more work? Regards, Chris You are right with oolithic. Lots of iron and calcite. Sandy/clay limestone. This member of the geological formation is called "Rotes Erzlager"-Red Ore Bed- since it was mined from the middle ages up to WWII for its iron. It's nevertheless not all that difficult to prep, since there is usually a good separating layer. However the iron tends to "rust" or erode away lots of fossil substance, so a good number of finds turn out to be throwaways. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Ludwigia Posted April 20, 2019 Author Share Posted April 20, 2019 2 minutes ago, Wrangellian said: I was wondering the same thing. It looks like some or all of the shell in some cases was dissolved away at some point. See above. The Cadocerases shown, for instance, are pure calcite steinkerns with no remaining shell substance. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Wrangellian Posted April 20, 2019 Share Posted April 20, 2019 That's what I thought. At least you've got some sutures to see then. 1 Link to comment Share on other sites More sharing options...
Plantguy Posted April 20, 2019 Share Posted April 20, 2019 2 hours ago, Ludwigia said: You are right with oolithic. Lots of iron and calcite. Sandy/clay limestone. This member of the geological formation is called "Rotes Erzlager"-Red Ore Bed- since it was mined from the middle ages up to WWII for its iron. It's nevertheless not all that difficult to prep, since there is usually a good separating layer. However the iron tends to "rust" or erode away lots of fossil substance, so a good number of finds turn out to be throwaways. Thank you sir! Continued hunting success! Regards, Chris 1 Link to comment Share on other sites More sharing options...
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