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Showing results for tags 'ammonoids'.
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Today i came to Lo Valdés, in Chile. A Jurassic formation based on abundant and relatively diverse ammonite assemblages. I found this!
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This is a Carnian aged natural association of Traumatocrinus crinoids, and either Trachyceras, or Neoprotrachyceras Ammonoids from Guanling Guizhou province China.
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found in Lebanon Not found in any specific formation but, according to the geo map i have, the rocks are late Cretaceous(albian-vraconian) lots of gastropods, bivalves and brachiopods around. i want to say its some sort of ammonite, but as far as known fossils here ammonites arent some of them. the ridges on it seem to be connected to each other like a puzzle would be (image 3). also the fossil tapers(image 1). this is all the information i have. Note: To my knowledge no Ammonites have been recorded in Lebanon Thanks for your help guys!
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Ancient Ammonoids’ Complex Shell Designs May Have Aided Buoyancy Control
Oxytropidoceras posted a topic in Fossil News
Ancient Ammonoids’ Complex Shell Designs May Have Aided Buoyancy Control University of Utah, April 13, 2021 Peterman, D.J., Ritterbush, K.A., Ciampaglio, C.N. et al., 2021, Buoyancy control in ammonoid cephalopods refined complex internal shell architecture. Science Reports 11, 8055 https://doi.org/10.1038/s41598-021-87379-5 Yours, Paul H. -
Hello everyone, Some time ago I was talking about a gastropod fossil with an individual online who thought that it was an ammonite, During this conversation one thing was brought up that I have wondered about for a long time but have not actually been able to answer, and that is what exactly do we consider an ammonite? I have always thought that ammonites are the cephalopods with an external shell containing complex sutures which occur throughout the Mesozoic, but people have pointed out that certain sites talk about ammonites going back to the Devonian. I have always thought that those were ammonoids but not necessarily ammonites, I don't know how I decided that this was the case and now I realize that this might be wrong. Does anyone know if those Paleozoic ammonoids are actually considered ammonites? What exactly is an ammonite and when do they appear? I would be very interested to hear what you guys have to say, any input is appreciated. Thank you!
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Pyrite ammonites painted?
JulianoLPD posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hi there everyone. I have some pyritized ammonites I believed to be real, but now I'm having second thoughts... The ammonoids from the picture below are both supposed to be pyrite, but why is one so much "golder" than the other? I know it is a natural process, so not every piece will be exactly like the other, but my ammonites are all like the first one, bright gold, and they are all from the same seller. I just wanted to know if they are real. I mean, if that's their real color or if they are treated somehow or painted, etc... Thanks in advance!
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From the album: Triassic In Situ Pictures
Triassic/Norian hardground with visible ammonoids. Genera are: Arcestes, Cladiscites, Rhacophyllites, Megaphyllites, Placites. -
From the album: Triassic In Situ Pictures
Psiloceras naumanni, from the Hettangian of the Alps -
From the album: Triassic In Situ Pictures
Block with small upper Norian ammonoid cross sections -
Full account of new fossil species reported last week (June 23 – 30, 2018):
Quail posted a topic in Fossil News
https://www.paleowire.com/the-moroccan-rhino-like-mammal-new-species-reported-this-week/
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From the album: alpine triassic Ammonoids
Hashplate of Ladinian age. The two smooth shelled ammonoids are inner cores of Gymnites cf. arthaberi(size= 3cm). The ammonoid top left is a Arpadites sp. A fragment of Protrachyceras cf. archelaus (darker brown spiny shell part down right) is evidence for Ladinian/Longobardian time(archelaus zone). -
Yesterday I started my fossil season 2018. It was the first real warm spring weekend this year. What a good feeling to get out again on such a beautyful day. Fortune was along with me and so I found several Triassic ammonoids. The small ones in the block are of upper Carnian(Tuvalian) age. The black Arcestes are of Norian age. Much snow is still on the higher mountains so it will last longer to start collecting at higher locations this year. regards Andreas
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Found these in a cluster, in New Mexico in an arroyo (dried river bed) in an area where many other fossils have been found. It's also a volcanic area. Manly ammonoids have been found. Can you help me identify these? Are they of any value?
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Plate from the Triassic/Carnian/upper Julian austriacum Zone
andreas posted a gallery image in Member Collections
From the album: alpine triassic Ammonoids
Size is 40cm x 18cm. Austrotrachyceras austriacum MOJS. (ribbed with nodes, 4cm diameter) on the left lower half, Joannites sp., Arcestes gaytani, Megaphyllites sp., Mojsvarites agenor(on top), small Sirenites sp. and several orthocone Nautiloids and bivalves. -
Hashplate from the Triassic, Lower Carnian, Lower Julian Aon Zone
andreas posted a gallery image in Member Collections
From the album: alpine triassic Ammonoids
Small slab (15cm x 11cm) showing a fauna from the Triassic/Carnian/ lower Julian zone of Trachyceras aon. The biggest black Syringoceras(Nautilus) measures about 4cm. Ammonoids on the slab are Celtites cf. steindachneri MOJS.(ribbed), Sphingites sp., Lobites elipticus, Sirenotrachyceras sp., Monophyllites sp., Arcestes sp., Asklepioceras sp. -
A mini fossil museum exists within the lobby of the Park Hyatt in Chicago, just off Michigan Avenue. I'm guessing not too many people know about it unless they're guests at the hotel. It's a wonderful display of very large Moroccan trilobites, ammonites and various other fossils from around the world. It is free, of course, because it's in the lobby and a nice diversion if you're ever in the area. Another added bonus is it's open 24 hours.
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From the album: alpine triassic Ammonoids
Hypocladiscites subtornatus (MOJS), 10cm diameter, together with Mojsvarites agenor(left side), Joannites sp. and orthocone Atractites sp. Triassic/lower Carnian aonoides zone. Hallstatt limestone of Austria. -
From the album: alpine triassic Ammonoids
Small slab with Trachysagenites cf. eximius MOJS.(Ammonoid with nodes, 2.5cm diameter) Associated with Arcestes sp., Megaphyllites sp., Paratropites sp., "Sandlingites" pilari and Isculites sp. Probably lower Tuvalian Dilleri Zone. -
From the album: alpine triassic Ammonoids
This part of a Triassic/Tuvalian ammonoid lense show probably the lower ammonoid zone(Dilleri Zone) of the Upper Carnian/Tuvalian stage. The upper half of the picture show a few Trachysagenites erninceus(ammonoids with stroger nodes) and a Tropites sp. core upon left. The lower part show Spirogmoceras sp., Traskites sp. and Paratropites cf. multecostatus with Isculites heimi(flat variant) -
That was probably my last trip this year. I decided to do a prospecting round. Crawl on the ground for six hours. The result was meager. Got some new insights but no good finds. Two Carnian Joannites sp. ammonoids were my find of the day. The Norian ammonoids of this layer I left in field. Nevertheless, it was a nice day. I met several of these yellow-black little guys. Now it is raining and weather forecast reports snow down to 600 meters altitude for tomorrow. regards Andreas
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From the album: alpine triassic Ammonoids
Block with Syringoceras sp., Monophyllites simonyi, Arcestes sp., Megaphyllites sp. and several orthocone Nautiloids -
Hi fossils friends, Here are some of my last preparations : Lower Triassic Flemingites lidacensis (Welter 1922) - 19 cm
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Because of the bad weather of the last two weeks I’ve started the prep work of a Upper Triassic/Carnian ammonoid block found on my first trip this year. Status of prep after about 12 hours.
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More Triassic Ammonoids prep. (Not the same that those of Andreas ;-))
Nothos posted a topic in Fossil Preparation
Hi fossils friends, here is a little taphonomic accumulation plate with many Olenekian (lower Triassic) Ammonoids. It comes from the Vikinghøgda Formation - Sassendalen group (Sassendalen valley - Spitsbergen island - Svalbard archipelago - Norway) Most of the Ammonoids are Svalbardiceras spitzbergensis (Freblod, 1930). Associated on the plate is an unidentified orthoconic Nautiloid (never seen this in the associated litterature), a bivalve and a partial Ammonoid from the Hedenstroemiidae family (at the top-left). Size of the plate is 11,5 X 9,5 cm. I prepared it with my Dremel engraver in about 8 hours.
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Today I started my collecting season. It was a successful day I found several Tuvalian Tropites and Jovites(greenish matrix) alas all a little incomplete. But that doesn't matter because I did it more for stratigraphy. At least I found near this location a Julian Block with ammonoids of the austriacum Zone.(reddish matrix) But it was a very hard work. Two broken chisels (of three) make me nervous on half time because my car was far away.
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