BLT Posted October 27, 2018 Share Posted October 27, 2018 I bought this rock at an antique shop today. It was labeled as a “tip”, of which I do not have much of an interest. However, I do think the tiny fossil embedded in it looks interesting. Is it a type of crinoid stem, or something similar? The back of the rock has some type of glue residue and green felt stuck to it. Link to comment Share on other sites More sharing options...
BLT Posted October 27, 2018 Author Share Posted October 27, 2018 Link to comment Share on other sites More sharing options...
Fossildude19 Posted October 27, 2018 Share Posted October 27, 2018 Internal cast of the inside of a crinoid stem. Or, ancient alien screw. 4 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
BLT Posted October 27, 2018 Author Share Posted October 27, 2018 Just now, Fossildude19 said: Internal cast of the inside of a crinoid stem. Or, ancient alien screw. I prefer ancient alien screw. Sounds intriguing! Link to comment Share on other sites More sharing options...
Rockwood Posted October 27, 2018 Share Posted October 27, 2018 It's why you don't see aliens around anymore they had a thread pitch of zero. 2 Link to comment Share on other sites More sharing options...
BLT Posted October 27, 2018 Author Share Posted October 27, 2018 (edited) 11 minutes ago, Rockwood said: It's why you don't see aliens around anymore they had a thread pitch of zero. Lol! I had to google “thread pitch” and then “thread pitch of zero.” I still don’t understand what it means. Must be a guy thing! Woo-Hoo! I finally found an explanation I actually understand! (Tools and such just aren’t my thing.) Edited October 27, 2018 by BLT Update Link to comment Share on other sites More sharing options...
Bronzviking Posted October 27, 2018 Share Posted October 27, 2018 This photo reminds me of a gastropod spindle. Link to comment Share on other sites More sharing options...
abyssunder Posted October 27, 2018 Share Posted October 27, 2018 It looks to have a similar preservation to the one below, which is an eroded crinoid stem fragment. picture from here 4 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Rockwood Posted October 28, 2018 Share Posted October 28, 2018 11 hours ago, BLT said: Lol! I had to google “thread pitch” and then “thread pitch of zero.” I still don’t understand what it means. Must be a guy thing! Woo-Hoo! I finally found an explanation I actually understand! (Tools and such just aren’t my thing.) You do have to sort of forget about the numbers and focus on the concept behind it for this to make sense I guess. It's the only way that seem natural to me though. 1 Link to comment Share on other sites More sharing options...
Rockwood Posted October 28, 2018 Share Posted October 28, 2018 9 hours ago, abyssunder said: eroded crinoid stem fragment The larger diameter radial elements are actually casts of the space between columnals. Right ? 3 Link to comment Share on other sites More sharing options...
abyssunder Posted October 28, 2018 Share Posted October 28, 2018 9 hours ago, Rockwood said: The larger diameter radial elements are actually casts of the space between columnals. Right ? Right The imprint of the crenulae is visible from both sides. 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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