Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
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Post by Fossilman on Jan 8, 2016 11:30:19 GMT -5
I just received the fossil from ToivO...Let me tell you,it has me stumped too! Did some homework lastnite and came up with a few answers that are close,but still don't fit right,by sight.. Some think it might be "Archimedes",I kind of ruled that out... It's not a Crinoid stem either.. The two species that are even close to what the photos are showing are: The Dawsonoceras and the Actinoceras........... We have a University just down the road a bit,will take it there and see if they can properly ID it... It's a very nice looking fossil in matrix...Will have fun work with it to see what is in the interior of it... Again thank you ToivO....
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Post by gingerkid on Jan 8, 2016 11:52:13 GMT -5
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
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Post by Fossilman on Jan 8, 2016 17:16:23 GMT -5
I am an ammonite collector,hunter and repairer.....I'm passing on the ammonite theory.... Will get my dremel tool out and start carving and chipping away at the outer matrix..Time will tell. Thumbs up ......
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Fossilman
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Member since January 2009
Posts: 20,685
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Post by Fossilman on Jan 8, 2016 17:20:23 GMT -5
Here are (or) is a photo of an Actinoceras.......(pretty close to watch I see,so far...
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Fossilman
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Member since January 2009
Posts: 20,685
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Post by Fossilman on Jan 8, 2016 17:22:35 GMT -5
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Post by toiv0 on Jan 8, 2016 18:32:42 GMT -5
you're welcome, it would still be in the bottom of a box a hundred years from now if I would have kept it. Glad someone can enjoy it.
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inyo
noticing nice landscape pebbles
Member since September 2014
Posts: 85
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Post by inyo on Jan 9, 2016 11:36:36 GMT -5
If Actinoceras or Dawsonocaras, as suggested as possibilities in this thread--the specimen would be an orthocone nautiloid cephalopod, more related to the modern chambered nautilus than to either an ammonite or ammonoid. Actinoceras lived during the middle and late Ordovician (some reports say that it slipped into the Silurian, as well) of the Paleozoic Era; Dawsonoceras existed during the late Ordovician through middle Devonian. Would be revealing to know the geologic age of the strata from which the mystery specimen came.
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Fossilman
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Member since January 2009
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Post by Fossilman on Jan 9, 2016 22:55:39 GMT -5
That's why I'm taking it to the University here,get a correct ID......Thumbs up...
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Post by Rockoonz on Jan 10, 2016 1:22:06 GMT -5
I will try to show it to some club members who are also in NARG at the meeting Tuesday.
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Fossilman
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Post by Fossilman on Jan 10, 2016 9:47:50 GMT -5
Quote "
Species
About 45 species have been described from North America, including Greenland and the Canadian Arctic with Actinoceras margaretae, A. aequale, and A. gradatum the earliest known, coming from the lower Blackriveran Loweville fm of Ottawa Actinoceras concavum from the Ssuyan of southern Manchuria is most similar to Actinoceras centrale from the Chaumont of New York. " Quote
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Fossilman
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Member since January 2009
Posts: 20,685
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Post by Fossilman on Jan 10, 2016 9:49:13 GMT -5
Quote" The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.7 ± 1.5 Ma (million years ago), to the beginning of the Devonian Period, about 416.0 ± 2.8 Ma (ICS, 2004)[5]. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by several million years. The base of the Silurian is set at a major extinction event when 60% of marine species were wiped out....."Quote
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inyo
noticing nice landscape pebbles
Member since September 2014
Posts: 85
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Post by inyo on Jan 10, 2016 21:04:43 GMT -5
Quote " Species About 45 species have been described from North America, including Greenland and the Canadian Arctic with Actinoceras margaretae, A. aequale, and A. gradatum the earliest known, coming from the lower Blackriveran Loweville fm of Ottawa Actinoceras concavum from the Ssuyan of southern Manchuria is most similar to Actinoceras centrale from the Chaumont of New York. " Quote Yes, that's a quote about Actinoceras that can be found at the following pages: Wikipedia: en.wikipedia.org/wiki/Actinoceras ;Project Gutenburg Self-Publishing Press www.gutenberg.us/Article.aspx?Title=Actinoceras ; and remote-database.com/c42fdeebdc63486a.html --references that agree with what I've been able to determine: Actinoceras is confined primarily to the middle to late Ordovician. I've yet to find a citation that places it beyond the early Silurian.
"Blackriveran" is roughly late Ordovician, by the way. "Chaumont of New York" refers to the middle Ordovician Chaumont Formation of New York state.
"The Ssyuyan of southern Manchuria" refers to Actinoceras kakui from the middle Ordovician Ssuyen Formation of northeast China, cited in the following publication: Special Papers - Number 42 The database of Japanese fossil type specimens described during the 20th Century(Part 4) Edited by Noriyuki Ikeya, Hiromichi Hirano, and Kenshiro Ogasawara Palaeontological Society of Japan June 2004:
Actinoceras kakui Endo, 1935 Sci. Rep., Tohoku Imp. Univ., ser. 2, vol. 16, p. 206, pI. 10, figs. 1,2 Holotype: IGPS 55573 Tao-fang-kou, 2.5 miles northwest ofPen-hsi-hu, Liaotung, Manchoukuo [Northeast China] Ssuyen Fonnation Middle Ordovician
I'm very interested to learn just what your mystery specimen is.
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