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Showing results for tags 'orthocera'.
Found 8 results
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Hello everyone. For a long time now I have had a doubt regarding the fossil conglomerates of Orthoceras. Are they real or artificial? Is it the same as with the Dactylioceras that died together in large numbers? I appreciate any response.
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Tried to find a place where you can supposedly find carboniferous/devonian fauna. I'm either really bad at prospecting or the site has been destroyed since the last reports (probably both). I ended up finding these on a couple of rocks that had been moved next to a house so I don't know their age. Orthoceras are cited from this locality, so maybe?? Could be funny-looking rocks too
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I've recently come to acquire a collection of various fossils from the Silurian of Gotland. One of the larger specimens is this: My thinking is that this is 100% either a particularly large rugose coral, or an orthocerid. Could use some help.
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Greetings! I borrowed this image from the internet for a reference. What is the unpolished matrix that the orthoceras are embedded in, is that fossilized limestone (aka marble or dolomite)?
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How rare are phragmocones from cephlapods? Are they something you need to get into a quarry to find, or can you recover them out of roadcuts? This is for the Midwest, like Illinois, Wisconsin etc.
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Hello. My husband found this at a garage sale, sometime last year. We have been told that this may be an Orthocera. If anyone would help us ID it and even perhaps what it may be worth, we would really appreciate it. Thank you in advance for the help in this matter. Violet
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From the album: MY FOSSIL Collection - Dpaul7
Orthocera Specimens 11" x 18" Morocco Data: Orthoceras ("straight horn") is a genus of extinct nautiloid cephalopod endemic to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is sometimes called Orthoceratites. Note it is sometimes misspelled as Orthocera, Orthocerus or Orthoceros (Sweet 1964:K222). Orthoceras was formerly thought to have had a worldwide distribution due to the genus' use as a wastebasket taxon for numerous species of conical-shelled nautiloids throughout the Paleozoic and Triassic. Now, Orthoceras sensu stricto refers to O. regulare, of Ordovician-aged Baltic Sea limestones of Sweden and neighboring areas. These are slender, elongate shells with the middle of the body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae (Sweet 1964:K224). Many other very similar species are included under the genus Michelinoceras. Orthoceras and related orthoconic nautiloid cephalopods are often confused with the superficially similar Baculites and related Cretaceous orthoconic ammonoids. Both are long and tubular in form, and both are common items for sale in rock shops (often under each other's names). Both lineages evidently evolved the tubular form independently of one another, and at different times in earth history. Orthoceras lived much earlier (Middle Ordovician) than Baculites (Late Cretaceous). The two types of fossils can be distinguished by many features, most obvious among which is the suture line: simple in Orthoceras, intricately foliated in Baculites and related forms. TIME PERIOD: Middle Ordovician (458-470 Million Years Ago) Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: †Orthocerida Family: †Orthoceratidae Genus: †Orthoceras -
Hello everyone, I am attempting to identify and generally date two fossils, one which I believe is a medium sized ammonite based on the fern-like outer shell patterning, and the other a large grouping of orthoceras. The 'ammonite' measures 12" x 10" x 6", and the grouping of 'orthoceras' measures 15" x 5" x 3-1/2". Any help would be greatly appreciated. Thanks in advance, Christy H.
