Roz Posted July 4, 2013 Share Posted July 4, 2013 I love orthocones but have found very few.. I would love to see everyone elses.. Mine are from the Pennsylvanian Period. These are so tiny I didn't know what they were until I viewed with my loupe.. Welcome to the forum! Link to comment Share on other sites More sharing options...
Missourian Posted July 4, 2013 Share Posted July 4, 2013 (edited) Here are a few. They are Mooreoceras or Pseudorthoceras. All are Pennsylvanian.... Winterset Limestone. The shell is encrusted with algae: Chanute Formation: Liberty Memorial Formation: Edited July 4, 2013 by Missourian Context is critical. Link to comment Share on other sites More sharing options...
TMNH Posted July 4, 2013 Share Posted July 4, 2013 I already posted some of mine in this topic: http://www.thefossilforum.com/index.php?/topic/16721-share-your-cephalopods/page-2?hl=%2Bshow+%2Bus+%2Byour+%2Bcephalopods#entry310480 Here is an additional Endoceras I found. It is around 2 feet long. Link to comment Share on other sites More sharing options...
Roz Posted July 4, 2013 Author Share Posted July 4, 2013 Nice ones! I didn't realize they could get that large.. Welcome to the forum! Link to comment Share on other sites More sharing options...
Caleb Posted July 4, 2013 Share Posted July 4, 2013 Here's a geodized specimen I picked up last weekend, 6-29-2013. Orthoconic Cephalopod Prosser Member, Galena Formation Ordovician Southeast Minnesota And here's my table at MAPS expo with bunch. The very large Endoceras sp. in the back is about 4ft long. Caleb Midwestpaleo.com Link to comment Share on other sites More sharing options...
JimB88 Posted July 4, 2013 Share Posted July 4, 2013 Actually Roz Endoceras could get 30' long heres a (smaller) one Link to comment Share on other sites More sharing options...
piranha Posted July 4, 2013 Share Posted July 4, 2013 Just for fun here are some examples of trilobites preserved within orthoconic cephalopods. One possible theory is the trilobites took safe refuge in the empty body chambers of a presumably long-dead host. Complete (non-exuvium) individuals suggest that the exoskeletons were left in-situ by live trilobites. Trilobite Tenement! Davis, R.A., Fraaye, R.H.B., & Holland, C.H. (2001) Trilobites within nautiloid cephalopods. Lethaia 34(1):37-45 1 Link to comment Share on other sites More sharing options...
Roz Posted July 5, 2013 Author Share Posted July 5, 2013 Here's a geodized specimen I picked up last weekend, 6-29-2013. Orthoconic Cephalopod Prosser Member, Galena Formation Ordovician Southeast Minnesota IMG_0595.JPG And here's my table at MAPS expo with bunch. The very large Endoceras sp. in the back is about 4ft long. IMG_0479.JPG I love geodized specimens of anything! You have some nice ones on your table, Caleb! Welcome to the forum! Link to comment Share on other sites More sharing options...
Roz Posted July 5, 2013 Author Share Posted July 5, 2013 Actually Roz Endoceras could get 30' long heres a (smaller) one endo.jpg I had no idea! That's a nice one for your collection.. I wonder why I find so few and they are so tiny.. I will have to keep looking for ones I can see without a loupe.. Welcome to the forum! Link to comment Share on other sites More sharing options...
Roz Posted July 5, 2013 Author Share Posted July 5, 2013 Just for fun here are some examples of trilobites preserved within orthoconic cephalopods. One possible theory is the trilobites took safe refuge in the empty body chambers of a presumably long-dead host. Complete (non-exuvium) individuals suggest that the exoskeletons were left in-situ by live trilobites. Trilobite Tenement! Orthoconic Trilobites .jpg Davis, R.A., Fraaye, R.H.B., & Holland, C.H. (2001) Trilobites within nautiloid cephalopods. Lethaia 34(1):37-45 I hope the rent was fair back then.. That's actually very interesting.. Welcome to the forum! Link to comment Share on other sites More sharing options...
BobWill Posted July 5, 2013 Share Posted July 5, 2013 I had no idea! That's a nice one for your collection.. I wonder why I find so few and they are so tiny.. I will have to keep looking for ones I can see without a loupe.. Two words...Jacks and boro:) You'll find plenty there you can see without a loupe like Mooreoceras, Brachycycloceras, and Michelinoceras. Here's part of the flared out body chamber of a Poterioceras, not a true orthocone though because the phragmocone has a slight curve to it which makes it cyrtocone. Link to comment Share on other sites More sharing options...
Roz Posted July 5, 2013 Author Share Posted July 5, 2013 Yes, I haven't been to Jacksboro in a very long time! I have never heard of a cyrtocone.. Will do some searching. Welcome to the forum! Link to comment Share on other sites More sharing options...
BobWill Posted July 5, 2013 Share Posted July 5, 2013 Cyrtocone is not so much a thing as a description. One book described cyrtocone as coiling without the whorls touching but the DPS occasional papers book on Jacksboro has it as a shell with any amount of curve. Compare it with orthocone which is straight and serpenticone which is the extreme of "evolute" where the whorls touch without any overlap. Link to comment Share on other sites More sharing options...
Herb Posted July 8, 2013 Share Posted July 8, 2013 An Ordovician one cut in half to show the siphuncle. "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Roz Posted July 8, 2013 Author Share Posted July 8, 2013 Very cool view, Herb! I love seeing the interior of a fossil.. Welcome to the forum! Link to comment Share on other sites More sharing options...
Ludwigia Posted July 8, 2013 Share Posted July 8, 2013 Here's another polished one. One of the few Orthocones in my collection since I don't travel in the paleozoic that much. Treptoceras trebriseptum from the Georgian Bay Formation from the viscinity of Toronto found on one of my rare trips to Canada. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Roz Posted July 9, 2013 Author Share Posted July 9, 2013 Quite beautiful polished, Roger. What did you use? Welcome to the forum! Link to comment Share on other sites More sharing options...
Ludwigia Posted July 9, 2013 Share Posted July 9, 2013 Quite beautiful polished, Roger. What did you use? Various grades of sanding powders on a rotating steel plate and then polishing on the same plate using powder on leather. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
hitekmastr Posted July 10, 2013 Share Posted July 10, 2013 (edited) DEVONIAN TREES THAT LOOK LIKE ORTHOCONES FOUND 4th of JULY TULLY NY - HAMILTON GROUP (Devonian) As previously posted, my wife and I found 3 fossils that we originally thought were orthocones standing vertically in the rock formation at Tully, NY. The images are posted on our Tully Trip Report but here they are again. UPDATE: I couldn't seem to find any documentation on orthocones this large, or any associated with the Hamilton Group at Tully - then other experts weighed in on our finds and they turned out to be ancient Devonian trees - in fact, the oldest known trees. Physically they look like mangal shoots (similar to how mangroves grow). The first verdict is that these are Wattieza sp. but it could be a different species. The images are labeled "orthocone" but are actually now as we believe, Devonian trees. Here are the three fossils in situ as we found them: Here is a closeup of the tip section of the first specimen showing the center core which we originally thought was the siphuncle of an orthocone but now it appears to be the stele in a very young tree growing in the shallow marine environment - next to it is a separate segment that was found separately, disarticulated in the rubble: We just returned from the trip and I am just beginning to photo-document these, which we were able to extract intact. Our impression is that it is rare to find these critters in situ exactly where they died. Also, I'm having a tough time finding any resources that will help determine the species, how rare or unique these are, etc. Edited July 15, 2013 by hitekmastr Link to comment Share on other sites More sharing options...
hitekmastr Posted July 10, 2013 Share Posted July 10, 2013 Michelinoceras F -.jpgAn Ordovician one cut in half to show the siphuncle. Herb - what did you use to cut it? Link to comment Share on other sites More sharing options...
hitekmastr Posted July 10, 2013 Share Posted July 10, 2013 I had no idea! That's a nice one for your collection.. I wonder why I find so few and they are so tiny.. I will have to keep looking for ones I can see without a loupe.. Check out the large specimens we just found at Tully... Link to comment Share on other sites More sharing options...
Roz Posted July 10, 2013 Author Share Posted July 10, 2013 lol, hitekmastr, you found mine's great, great, great grand-daddy! Welcome to the forum! Link to comment Share on other sites More sharing options...
hrguy54 Posted July 14, 2013 Share Posted July 14, 2013 I've found these in the Dayton, OH area....Ordivician. Link to comment Share on other sites More sharing options...
Roz Posted July 14, 2013 Author Share Posted July 14, 2013 Nice ones, hrguy, especially that last one. The coloring is beautiful! Welcome to the forum! Link to comment Share on other sites More sharing options...
Bev Posted July 14, 2013 Share Posted July 14, 2013 Ordovician. Galena Formation Se MN This is a very nice little guy, about 5 inches long. Anyone happen to know what it is for an ID? Bev The more I learn, I realize the less I know. BluffCountryFossils.NET Fossil Adventure Blog Go to my Gallery for images of Fossil Jewelry, Sculpture & Crafts Pinned Posts: Beginner's Guide to Fossil Hunting * Geologic Formation Maps Link to comment Share on other sites More sharing options...
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