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Showing results for tags 'orthoconic cephalopod'.
Found 8 results
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Hi all! Please tell me this is more than a concretion! Edit to add location: Found in Lansing, NY. The matrix is a dark grey/black shale that breaks under it's own weight when I lift pieces and it breaks off into big chunks unlike thinner layered shale also in the area. I think I see crinoid stems and wonder if there are other fossils (Hallotheca acils ?) under a shallow layer of sediment making the cone shape appear to have rounded sides or is this something completely different (I think I've been finding nice molds of Hallotheca acils in close proximity to where I found this guy today). I hope to return tomorrow and find the other half to try and glean more information from the molded half. It was the only fossil in this piece of stone but I found two species of Rugosa and multiple species of Brachiopods in similar stones lying within a foot of it. It's delicate and I've wrapped it in wet paper towels and placed in a shallow dish with water. The entire item measures 2cm wide x 8 cm long. Thank you for your time
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Two sets of orthoconic cephalopods (Upper Ordovician)
Rogue Embryo posted a gallery image in Member Collections
From the album: Camille's fossils - Georgian Bay Formation
Field collection by Camille Martin, April 4, 2022 Note the nummuloid siphuncle in the bottom image -- two "buttons" are visible (circled). A good candidate would be Treptoceras crebriseptum.© Camille Martin
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- etobicoke creet
- georgian bay formation
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From the album: Camille's fossils - Georgian Bay Formation
Field collection by Camille Martin, September 14, 2021© Camille Martin
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- georgian bay formation
- mimico creek
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From the album: Camille's fossils - Georgian Bay Formation
Field collection by Camille Martin, September 14, 2021© Camille Martin
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- georgian bay formation
- mimico creek
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From the album: Camille's fossils - Georgian Bay Formation
Field collection by Camille Martin, September 14, 2021© Camille Martin
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- georgian bay formation
- mimico creek
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From the album: Camille's fossils - Georgian Bay Formation
Field collection by Camille Martin, September 14, 2021© Camille Martin
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- georgian bay formation
- mimico creek
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From the album: Camille's fossils - Georgian Bay Formation
Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Orthocerida Family: Proteoceratidae Genus: Treptoceras Species: T. crebriseptum Author Citation: Hall (1847) [then known as Actinoceras crebriseptum] Eon: Phanerozoic Era: Paleozoic Period: Ordovician Sub Period: None Epoch: Late Georgian Bay Formation Mimico Creek Toronto Ontario, Canada Field collection by Camille Martin on 09/14/2021 Comments: Sephuncle segment compression ratio (SCR) = 1.0 EQUIAXIAL T. crebriseptum is a species of Treptoceras found in the Georgian Bay Formation at Toronto. See Robert C. Frey, "Middle and Upper Ordovician Nautiloid Cephalopods of the Cincinnati Arch Region of Kentucky, Indina, and Ohio" (1995) 25-26, 45.-
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- georgian bay formation
- mimico creek
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How do you distinguish between tentaculites and orthoconic cephalopod fossils?
