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Showing results for tags 'sinemurian'.
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Hi guys, i've receiced those ammonites from @Svetlana, they are sinemurian. I tried.to figure out what species they are. Note that the carena is well marked for all of them and they all show costulations. For that first one i found nothing but Oxynoticeras or Asteroceras, i'm absolutely not satisfied about that. For the second one i've found Echioceras rhodanicum And for the third one Orthechioceras maybe cf. viticola
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Hunting trip for Sinemurian ammonites (Transcarpathian region, Ukraine)
Svetlana posted a topic in Fossil Hunting Trips
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From the album: My collection in progress
Gryphaea arcuata Lamarck 1801 Location: Baudrecourt, Moselle, Grand Est, France Age: 199 - 190 Mya (Sinemurian, Early Jurassic) Measurements: 6,7 cm (diameter) Kingdom: Animalia Phylum: Mollusca Subphylum: Conchifera Class: Bivalvia Subclass: Pteriomorpha Order: Ostreida Family: Gryphaeidae-
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From the album: Cephalopods Worldwide
25cm. Early Sinemurian, Early Jurassic (Lias). Provenance unknown.- 3 comments
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Hi guys, I’ve got these 2 belemnites from the sinemurian of Lyme Regis and I was wondering whether it would be possible to put a name on them, thanks 1. 2.
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I would be grateful for help with identification of this ammonite. It is Sinemurian and found in Gloucestershire.
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Hello to all. Some photos from a recent trip. Nature is waking up, and the accompanying finds are pleasing to the eye.
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Some samples of the Sinemurian stage of the Jurassic period
Svetlana posted a topic in Member Collections
Hello all. After a long break, I would like to show some examples of the Sinemurian Jurassic from my collection. The Sinemurian Stage (Sinemur) is a stratigraphic subsection, the second from the bottom stage of the lower section of the Jurassic system of the Mesozoic era. Covers time from 199.3 ± 0.3 Ma to 190.8 ± 1.0 Ma. As far as I know, these fossils are not very widespread. Arietites (Coroniceras)?.. I am not sure about these ammonites -
Lyme Regis plesiosaur propodial with pyrite disease - how to treat
pachy-pleuro-whatnot-odon posted a topic in Fossil Preparation
Hi all, A couple of years ago I acquired a lovely pair of plesiosaur propodial bones from Lyme Regis. It was a matched pair of both humerus and femur. Today, when I was looking to make space in my cabinet for a new acquisition I had made, I discovered some odd dust next to the humerus that, on inspection and to my horror turned out to be pyrite bloom! I immediately removed the specimen from the cabinet, checked the other podial and nearby fossils, and used a tooth brush to brush of the most direct traces of pyrite decay. But the question is: what now? How do I ensure the propodial's preservation, and make it safe for display again. Should I store affected piece in an open or closed container? I suspect the latter, together with silica beads to consume any excess moisture might be best right now. But how do I get to the point where I can take it out again? Any suggestions are welcome. From my own thread on this topic I know of the existence of pyrite stopper, which sounds ideal for this situation. But I've also been warned that this is quite a hazardous solution and am therefore afraid of trying this out myself. So, part of the question would be whether someone offers pyrite treatment as a service, of knows of someone who does. Thanks in advance for your help! @Ptychodus04 @DanJeavs @paulgdls @RuMert and others -
Fossil hunting trip to Tontelange (Jurassic of Belgium)
ziggycardon posted a topic in Fossil Hunting Trips
On saturday I went on my first fossil hunting trip of 2021 with the BVP. Normally we would visit my favorite quarry "the Romontbos quarry" in Eben-Emael which is Maastrichtian in age, but due some complications that trip has been posponed till the end of September. Instead we went to the SETIM quarry in Tontelange in Belgian Luxembourg which was quite cool as it supposedly only the 2nd that this quarry allowed fossil hunting so everyone was quite excited. The rocks we hunted in this quarry are Jurassic in age, mainly Hettangian & Sinemurian. The lower levels of the quarry also had deposits of the Triassic (Rheatian) but those were not exposed at the moment unfortunately. But I had a great time at the quarry and I was very pleased with my finds. In a few of the quarry walls were used as nesting for sand martins (Riparia riparia) A piece of rock with the imprint left by a coral in it. A rock with some beautifull Crinoïd stems.- 13 replies
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From the album: Brachiopoda
3.5cm. wide Arietiten Schichten Sinemurian Early Jurassic Found in the Wutach area of southern Germany-
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From the album: Early Jurassic Ammonites from Southern Germany
35cm. Arietenkalk Sinemurian Found on a construction site in Wellendingen, B.-W.- 2 comments
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A piece of the so-called Marston Magna Ammonite Marble measuring 12 x 7 x 5 cm. These are often polished, creating decorative objects.
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From the album: Cephalopods Worldwide
The largest ammonite has a diameter of 3cm. The block measures 12x7x5cm. These blocks are often cut and polished, hence the name "marble". obtusum zone Marston Magna Marble Sinemurian Early Jurassic Found at Marston Magna, Somerset, England-
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This ammonite was found in association with Tmaegoceras nudaries and Coroniceras luningense, indicative of the Mullerense Subzone of the Involutum Zone of the early Sinemurian. The venter is compressed and rounded on early whorls but becomes subquadrate on the outermost preserved whorl, with the strong ribs extending completely over it. Any suggestions as to its genus are most welcome!
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Hi everyone, I found this ammonite recently on the beach between Lyme Regis and Charmouth in England and was hoping someone might be able to tell me what species or genus this is? It is from the Charmouth Mudstone Formation, and is about 190 million years old. If additional photos are required i can get more. The diameter of the ammonite is approx. 6 cm. Thank you!
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- ammonite
- charmouth mudstone formation
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From the album: Brachiopoda
3cm. bucklandi zone Sinemurian Early Jurassic Site: Mundelfingen, Wutach, Germany- 4 comments
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Arietites (Paracoroniceras) charlesi (Donovan 1955)
Ludwigia posted a gallery image in Member Collections
From the album: Early Jurassic Ammonites from Southern Germany
45cm. Arieten-Schichten Sinemurian Site: Wellendingen, B.-W. Despite the size, this is only a part of the phragmocone. Just imagine how large it must have been including the living chamber!-
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Arietites (Paracoroniceras) charlesi (Donovan 1955)
Ludwigia posted a gallery image in Member Collections
From the album: Early Jurassic Ammonites from Southern Germany
40cm. With Gryphaea arcuata oysters attached semicostatum zone Sinemurian Found in the Wutach area-
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This time it was a large Arietites solarium from the Early Jurassic Sinemurian with a diameter of 60cm. which my friend brought to me. Here's what it looked like towards the beginning of the prep. I had just trimmed off the matrix around the edges and moved on into the whorls a bit with a club hammer and pointed chisel beforehand. I had marked the point with a red line where I figured that the ribs would probably not be there any more and asked him if I should carry on nevertheless and do some carving to finish it off. He agreed, so I carried on. The matrix on these pieces can get very hard and this one turned out to be particularly stubborn. It started to get interesting however as time went on, since pieces of rib were turning up where I hadn't expected them. Just goes to show that even with experience you can make false judgements. Since I didn't want to risk damaging the ribs, I started using the abrader as well as the air pen and moved back and forth between the two. Here's how it looked after about 6 hours. It was getting even more interesting, since the ribs just kept on appearing. But the matrix started to get even harder, so I had to turn the pressure on the abrader up to 8 bar (120psi). It was also getting a little strenuous having to lift up the thing each time I had to clean the powder and grit out of the box in order to refill the abrader tank, so I was having to take a few coffee breaks in between. Here's what it looked like after another 6 hours or so. As you can see, I had discovered more ribs farther along the line. The trick is to try to follow the seam between the outer and inner whorls in order to ascertain what's under the matrix without causing any major damage. You can also see the area in between where there is still some matrix. The problem was that the ribs were there, but they had been pressed quite a bit downwards. I worked along a bit more and then sent him the following photo to ask him if I should carve the matrix within the circle or remove it and also to show him with the red line where I thought that the ribs finally disappeared. He decided that I should carve that spot, which turned out to be the right decision in the end. I then ended up discovering a few rib remnants on the way to the centre, but from there on it was mostly carving with the air pens and then smoothing everything out and removing the excess matrix with the abrader. I still had a bit of work ahead of me filling in gaps and making the odd improvement with epoxy putty. Then balancing the color on the repaired spots and finishing off with my trusty rember beeswax finish. By the time I was finished I had invested 28 hours in getting this guy done, but it sure looks to me like it was worth it. My friend too
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From the album: Early Jurassic Ammonites from Southern Germany
29cm. Arietitenkalk Sinemurian Early Jurassic Found at Trossingen, B.-W.- 2 comments
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Arietites (Paracoroniceras) crossi (Wright 1879)
Ludwigia posted a gallery image in Member Collections
From the album: Early Jurassic Ammonites from Southern Germany
76cm. diameter. bucklandi zone Early Sinemurian This is one of the largest ammonites to date which I've prepped on commission. 26 1/2 hours of work went into this. Below is a photo of how it looked after I was about a third of the way through.- 2 comments
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From the album: Early Jurassic Ammonites from Southern Germany
20cm. Arietenkalk Formation Sinemurian Found at a construction site in Wellendingen.- 2 comments
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Practically complete.
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- arietenkalk
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