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Showing results for tags 'Ammonite'.
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I do not have any specific formation or location information other than that these are from Russia.
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Hey Everyone, Wife has decide to join me tomorrow morning. I really enjoy her company and our time out there. Wondering if anyone can help me locate an easy access point to a creek , or area, that might produce some ammonites near Fort Worth. I have a couple species I am looking for in that area. I have not hunted Fort Worth except Lake Worth. Thanks on advance for any suggestions, George
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Please help me identify the genus of this ammonite, it's from cretaceous/Madagascar, .Thank you very much!
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https://www.cbc.ca/news/canada/saskatchewan/fossil-hunters-ammonite-martensville-1.6318124
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I find the time to "open" this chalk ball from the Cap blanc nez northern France,i was almost certain to broke the sample,that's happen and i have to glued it,but i found a little track of shell when i dig it a little a very nice brachiopod inside perfectly "fresh"! nice surprise!
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From the album: Russian Lower Kimmeridgian ammonites
Tatarstan rep., Tetyushi, cymodoce zone- 1 comment
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- crussoliceras
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Hi guys I have this Ammonite from a Victorian collection, supposedly from beachy head, and I was wondering what your thoughts on it were? Thanks
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Hello everyone, I have a couple ammonites that are above my skill level to prep. Anyone in the Dallas, TX area good at Prepping? George
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From the album: Russian Lower Kimmeridgian ammonites
Tatarstan rep., Tetyushi, cymodoce zone-
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- crussoliceras
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Picked up two large items the other day. I figure they are large ammonites but the disks toward the bottom on the cleaned up one are confusing. They would be bilateral equal except for the break in the one. The second is about 125lbs and has an dark orange/blk pattern showing thru in areas that appear to be shell. Neylandville Formation, Hunt County TX
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Hi all, I am finally getting ready to proceed with stabilizing the specimens I found in this trip: They are basically big sandstone steinkerns, now fully dry. They were found in ferrous sandstone concretions surrounded by sand. The matrix is soft , pieces can be broken off with fingers. I was advised to brush ammos with a PVA solution, but then I thought what if I use Paraloid instead? So the questions are as follows: 0. Is it worth it? 1. If so, what solution should I use? 2%? 5% or more? 2. How much will be required? (the biggest ammo is about 40 cm in diameter and 15 cm thick, 20+kg) 3. How and how many times to apply? With a brush? Once a day for several days in a row (as with PVA) or otherwise? 4. Do I need to cover the surface with a stronger solution afterwards? Thanks in advance! The matrix:
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In the few trips made to Trinity river in Tarrant county I've spotted several peices of these large whorls, I'm wondering if these are from Mariella ammonites or a heteromorph? I have found some pretty big Mariellas in Grayson marl but nothing close to this size. Is that maybe where they originate?, is the Trinity cutting through that formation? I'd love to figure that out and try to find a more complete one.
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Any idea which species this is? The ammonite is from Madagascar, but I don't have the exact location. Size 26 inches, weight 120 kgs
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Hi friends, I went to Aruma formation area (Campanian-Maastrichrtian) to the North of Riyadh city and found this small fossil , 26mm long by22mm What could it be?
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Life reconstruction of the Ammonoid Koenenites
Bringing Fossils to Life posted a topic in Paleo Re-creations
Here's the reconstruction of Koenenites I promised. Koenenites was a Devonian ammonoid with a very compressed shell and sharp keel. It was designed for fast swimming and thanks to the shape of its suture, it could accelerate very quickly compared to the ammonoids around it without its cameral fluid sloshing around and shifting its center of gravity. Because of its evolute shell, it likely had a large hyponome, which goes with the shape of its shell. After looking at some pictures of Koenenites fossils from Michigan that may have preserved the Supercephalic Attachment Area, I arrived at the proto-hood size in the picture. The eye size was inspired by the "ammonite preserved out of its shell", which preserved what is likely the ammonite's eye-cups, though eye size varies greatly. I based the hooks off of those of the much later ammonites, so Koenenites may have had ones different form those shown here. These preserved hooks were in positions similar to those on today's squid's tentacles, so ammonoids likely had elongated tentacles. The 8 thin, retractable arms were inspired by fossils of Baculites ammonites, though Koenenites was an active pursuit predator and Baculites a planktivore. Koenenites could afford smaller arms, though, because it likely had two muscular tentacles. I reconstructed this ammonoid's shell with a monochromatic color pattern, because nektobenthic ammonites have been found with this. Shell orientation based on preserved Supercephalic Attachment Areas. The second picture shows how Koenenites' (3A, 3B) suture shape helped it accelerate faster without its cameral fluid sloshing than other ammonoids like Agoniatites (1A, 1B) and Tornoceras (2A, 2B). bottom shows what would happen when the ammonoids started cruising at a slow to moderate pace, top shows what would happen when they tried to accelerate quickly. The lobe of the next suture would break the wave of cameral fluid so that its entire weight would not all hit the venter, but only a little bit. This shows that while Koenenites and Tornoceras were comfortable accelerating quickly, Agoniatites was more stable at cruising at an even speed. Any suggestions would be helpful! If there are any papers about ammonoid (or more specifically ammonite) soft tissue, that would be helpful too.
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From the album: Russian Lower Kimmeridgian ammonites
Ulyanovsk Oblast, Undory, cymodoce zone, pyrite -
From the album: Russian Upper Kimmeridgian ammonites
Tatarstan rep. Tetyushi, Au. mutabilis zone. D 1.5 cm, pyrite-
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From the album: Russian Upper Kimmeridgian ammonites
Tatarstan rep. Tetyushi, Au. mutabilis zone. D 3 cm, pyrite -
I found a few days ago this fragment of ammonite, (Cretaceous). I was wondering if any of you might recognize her.
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I’m not sure what this is. This little croissant shaped guy struck me as interesting as I was hunting through a pile of limestone in our new construction neighborhood in northern Bexar County, Texas. It’s in northern San Antonio. I thought it might be a shell of some sort. It’s about 4.5 to 5 inches wide and about 1.5 inches in depth. It has striations here and there and a shape that looks like a nautilus, but may just be an interesting concrete on or piece of limestone. Anyone got any ideas or answers? The ‘center’ of the ‘croissant’ has a grayish area that’s really different from the rest of it. Thanks for any ideas!!!
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Didymoceras cheyennense?
Mochaccino posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello, Does this association of Didymoceras cheyennense and Baculites compressus seem legitimate? Any restoration/reconstruction going on, or composite of multiple individuals, especially on the Didymoceras? Dimensions are 22cm x 14cm x 14cm, and listed as of Lower Cretaceous age and from the Pierre Shale of South Dakota. Also, if you had to pick one heteromorph ammonite specimen, would you personally purchase this for your collection (i.e. is it a good example of Didymoceras cheyennense)? I realize this is just a part of the inner whorls. Complete Didymoceras in general seem to be very rare and exorbitantly expensive so perhaps this is a good enough piece? I don't exactly have a fortune to spend, but I can justify one big purchase as a gift to myself. Thanks.
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Has anyone got any advice on drawing ammonites accurately? It is often the ribs which identify an ammonite, so they are very important to get right and while I my observational skills are fairly good, I find it hard to believe people like Ernst Haeckle relied purely on observation. I don't strive for Haeckle's realism as I draw in a more sketchy manner, but I do strive for accuracy all the same. Is there a sort of formula to plot ammonite ribs? Thanks!
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On our last fieldtrip to France this weekend we found a chalk-boulder with a quite large ammonite in it. The chalk was realy hard, but I was able to reduce it in size to take it back home. At the start of the prep with chislle and hammer I got a lucky split where the boulder opened to reveal most of the ammonite. The airscribe then did a quick job to remove the last bits. Sadly the center of the ammonite wasn't preserved, I tried to sculpt the center as well as I could and coloured it to match the fossil. As for the determination we had a little doubt between Cunningtoniceras inerme and Acanthoceras rothomagense as both species can look a lot alike and this specimen was slightly deformed in the chalk whitch made determination a bit harder, but most of the sings point towards A. rhotomagense .( the whorls here being higher than wide ) As found: the end result: A. rhotomagense mid. Cenomanian Cap-Blanc-Nez ( France )
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