kerrimarie805 Posted January 5, 2018 Share Posted January 5, 2018 The fossil I want most to find, at this point in my addiction, is a tullymonster. A few months ago, I thought this might be one, but, now, I'm fairly certain it's just a geode and am just double checking by asking for an ID. I actually really dig (that's so punny, lol!) geodes, so I'll add it to my collection, but I have enough criniods and brachiopods. I'm throwing a little tullymonster fit! Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted January 5, 2018 Share Posted January 5, 2018 Just a nodule, I think. I do so hope I'm wrong. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Douvilleiceras Posted January 5, 2018 Share Posted January 5, 2018 Did you find this in Pennsylvania? If so, it's certainly not Tullimonstrum gregarium, as the enigmatic creature is only found in the Carboniferous sediments of Illinois. Looks to be geological instead. Regards, Jason "Trilobites survived for a total of three hundred million years, almost the whole duration of the Palaeozoic era: who are we johnny-come-latelies to label them as either ‘primitive’ or ‘unsuccessful’? Men have so far survived half a per cent as long." - Richard Fortey, Trilobite: Eyewitness to Evolution. Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 I'm saying "geode" because my understanding is that any rock that is different on the inside than it is on the outside is, technically, a geode. Not all geodes are crystals and unicorns inside, which is why I'm calling it a geode. And I'm not completely sure what you mean by "nodule." Would that be just a broken off protrusion from a larger rock formation? Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 4 minutes ago, Douvilleiceras said: Did you find this in Pennsylvania? If so, it's certainly not Tullimonstrum gregarium, as the enigmatic creature is only found in Mazon Creek, Illinois. Looks to be geological instead. All found in PA, yes, and that is what I've found in my own research on the Tullimonstrum. I was hoping by some stretch my sources were not 100% correct, pout. It seems, now, that I'm gathering definitions of exactly what constitutes a geode. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted January 5, 2018 Share Posted January 5, 2018 A geode is hollow, this does not appear to be. A nodule is a rounded piece separated from the main mass of strata it originated in, like chert lumps or flint for example. 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Bobby Rico Posted January 5, 2018 Share Posted January 5, 2018 Geodes are formed when groundwater deposits minerals within cavities in rock. Geodes form very slowly, filling the cavities with quartz crystals from the edges in. Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 I need more answers! I've been going rounds with more than one person who seems to and claims to know geology, one who has a degree in it, about that very point! I have spent enough time in the Black Hills of South Dakota to have learned that geodes are crystals and unicorns, AND hollow. Others have recently and adamantly opposed this by telling me that a geode is simply any rock that is different on the inside than it is on the out. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted January 5, 2018 Share Posted January 5, 2018 http://www.rocksandminerals4u.com/geodes.html https://www.merriam-webster.com/dictionary/geode Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Bobby Rico Posted January 5, 2018 Share Posted January 5, 2018 I think a nodule is a geode that has filled completely with deposited minerals, leaving no hollow in the middle and we say nodule in this case. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted January 5, 2018 Share Posted January 5, 2018 https://en.wikipedia.org/wiki/Nodule_(geology) 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Bobby Rico Posted January 5, 2018 Share Posted January 5, 2018 Sorry what do you mean by unicorns? Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 8 minutes ago, Bobby Rico said: Sorry what do you mean by unicorns? I'm sorry! I mean pretty crystal formations, unicorns are pretty. Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 19 minutes ago, Bobby Rico said: I think a nodule is a geode that has filled completely with deposited minerals, leaving no hollow in the middle and we say nodule in this case. Thank you, so a nodule can be completely enclosed, unlike the nodule in my first pics? Link to comment Share on other sites More sharing options...
Fossildude19 Posted January 5, 2018 Share Posted January 5, 2018 Looks like a chert nodule. 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...
Bobby Rico Posted January 5, 2018 Share Posted January 5, 2018 Just now, KraZshardLady said: I'm sorry! I mean pretty crystal formations, unicorns are pretty. Ok sorry, I thought that was a geological term . Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 1 minute ago, Bobby Rico said: Ok sorry, I thought that was a geological term . It is if you're a fairy! Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 All nodules? Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted January 5, 2018 Share Posted January 5, 2018 The first looks like a piece of rock with a quartz or calcite vein at one end. The second looks like an infilled geode. And the last two seem to be nodules, yes. 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 Thumbs up, I'm catching on! Link to comment Share on other sites More sharing options...
kerrimarie805 Posted January 5, 2018 Author Share Posted January 5, 2018 Infilled geode? Link to comment Share on other sites More sharing options...
ynot Posted January 5, 2018 Share Posted January 5, 2018 First picture- chert nodule Second picture- bedrock with mineral vein remnants Third picture- crystal filled nodule- not geode (geodes have to be hollow mineral lined rocks.) Forth picture- bedrock with mineral vein remnants Fifth and sixth pictures- small piece of agate with a "crust" of oxidization (white) 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
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